So at low fuel tank levels I added a good diesel stabilzer (PRI-D) which has been a good one for me. The gauge wont probably ever move again until it is changed. The fuel gauge is sitting at 7/8 full no matter which tank I have selected. Until you fill-up the tank, the fuel indicator should continuously go toward empty if everything is working as it should. Instead, acquire the skills necessary to correctly identify the issue and resolve it. 2. An incorrect fuel gauge is always the result of one of the three components that are required to tell the driver how much gasoline is left in the tank. Due to the connection to the fuel pump modules constant exposure to the outside, these flaws are most frequently seen there. Ok thats was that regarding the sending unit, what about the gauge itself. This problem can also be brought on by a bad resistor in the system. Darn, those pics by captainchris aren't giving me much hope that taking the sending unit out for a cleaning is actually going to do anything for me. May 8, 2020 (Edited) Your JBBF > F5 Status > F3 Sensors Screen shows NO signal from EITHER Left or Right Tank Sensor. The sending unit is where the whole process begins. Of course, it is unpleasant to drive while the gasoline gauge is erroneous. Having the correct size socket is always preferable. WogsRus. The W123 was approachable, inviting, and just plain pleasant to look at. Its completely connected, not utilizing several circuits. Between models on W123 Sedan , Coupe , StationWagon , Gas , Diesel ,200 , 250 , 300 etc, etc, it's a lot difference in fuel capacity, now to my question,,. The valve closes and the water stops flowing when the float arm reaches a specific height. You could see the tank is halfway full one moment, and then it might read empty the next. See links below for more info and trouble shooting ideas. The fuel sending unit in fuel injected vehicle is built . Continue reading to discover the most typical reasons for damaged fuel gauges and how to spot them. Fuel, Air & Turbo Systems 123 Chassis. My fuel gauge for the past few days has showed I only have a 1/4 of a tank left so I went to fill it up today. Test easily by tipping the sender up and down with the plug attached and the key on . The low fuel light is also not connected to the fuel gauge, so even if the gauge is faulty, the light will still work as it should. When more than one gauge is behaving strangely, check this first since its probably the answer to your fuel gauge issue. I have done the needle sweep test and the fuel gauge does sweeps the whole way . The gauge would include sensing or sending a unit that measures the amount of fuel actually left, and a gauge that . Reply, Sable Quisiera donde lleva el tiempo de temperatura mercedes ben 280e 1981, Hugo Uribe - On top of the sending unit is a large black plastic plug for the wiring that goes to the fuel gauge. If you plug the connector back and test again, the fuel gauge . Tank is full. They also chose to install a fuel strainer at the main outlet for the fuel tank to keep large particles out of your W123's fuel system. The tank of your toilet has a float arm. Sending Unit Failure . If the instrument cluster is still not working, then you'll need to have it checked by a mechanic or dealership. 1985 Base price of a 300D-T: unchanged from 1984. No low fuel indicator light either. Parts can get disconnected, worn, or corroded. Neither of these are mine, I just found the pictures online but, I recently replaced my fuel gauge, which looks like the first one, without the silver button in the middle with a fuel gauge that looks like the second one, the with the silver button in . This test applies to Mercedes-Benz vehicles equipped with 4-cylinder . Once it's drained you can remove it all the way to service it or to proceed at installing your replacement part. Mercedes Benz 123 W123 Workshop Service and Repair Manuals, Models: 200 230 230E 250 280 280E 200D 220D 240D 300D 300D*T 230C 230CE 280C 280CE 300CD 300CD*T 200T 230T 230TE 250T 280TE 240TD 300TD 300TD*T . The worlds largest selection of new, used and hard to find Mercedes-Benz 123 chassis fuel, air and turbo parts. Then added a tank full of B20 and no more probelems. That's right, there is another filter in the tank on your W123! You can accomplish this yourself quite easily and for a very little cost. I have pulled the cluster apart and the needle moves freely, and when I pull the servo out I can put a 9-volt to the prongs and it moves in either direction. On the other hand, if your fuel gauge is showing a full reading, it means the sending unit is faulty and due for replacement. https://mercedessource.com/problems/elec http://www.benzworld.org/forums/w126-s-s Mercedes W123 Fuel Sending Unit Replacement. Switch relay back to original relay & gauge still not working. about 4-5 ohms full & around 80-85 ohms empty. The fuse is another replacement component that can solve your fuel gauge. The gauge could abruptly change its position or give you an incorrect reading. Make sure the key is off whenever connecting/ disconnecting the connector/ grounds etc. To prevent harm to the automobile, consult a specialist if you are doubtful. However, you can see unusual behavior when the fuel gauge sender begins to fail. W202. You might run out of gas suddenly if your gas gauge isnt functioning because of the erroneous information it offers. A faulty fuel gauge sender may cause the gauge to suddenly change positions, or give an inaccurate reading. I took it out and apart today, . gasoline-sending unit/fuel pump component. Try pulling the potentiometer ( the square box) off the back of the panel , throwing it away and connecting the 2 terminals with a jump . I've forgotten but on many vehicles, you can measure resistance as the float level changes. The simplest place to start is by consulting your owners handbook to learn how to conduct an instrument cluster self-test. Start by removing this (not pictured) by pulling straight up on it. When the ignition is turned on, 12V power is applied to one of these connections. Fuel gauge troubleshooting begins with isolating the problem either to the gauge, sending unit, fuse or wiring. ORIGINAL SURFACE PAINT IS FADED AND HAS BLEMISHES. The gauge cluster and fuel gauge on more recent automobiles are far more challenging, if not impossible, to test. It is superseded by the W124, aka the first E-Class. Inadequate wiring between the gauge and gasoline sender or a blown fuse for the fuel gauge are other potential causes. The more fuel that is in your tank the longer it will take to drain the unit. It's also possible for the fuel gauge to become damaged. The simplest way to determine your cars fuel efficiency is to keep note of how many miles you go between fill-ups and divide that figure by the number of gallons of gas you put in at the subsequent fill-up. If you experience the fuel gauge not working in your car, its critical to locate the problem and then create a repair strategy. CD/DVD: W123 C123 S123 Diesel Models Manual . Replace it with a new one if it is blown. It looks like the fuse would handle the entire cluster. In this article, we are going to cover the most frequent reasons for car fuel gauge not working and the possible way to fix this problem. I am not a mechanic, but have a theory that seems to work for biodiedel and sticky fuel gauges. Its also possible for the fuel gauge to become damaged. Connect a jumper wire between S terminal of the gauge and the G terminal or ground. Although both of these W123 fuel gauges are from different years, they should be interchangeable, right? For this test, you will need a fuel pressure gauge. Have read some stuff before but now need to ask a question. If you suspect that your fuel pump is not working, you need to perform a fuel pressure test to verify. If like my 1960's U.S. cars, the most common problem in an old sender is that the brass float develops a pinhole leak and no longer floats. On a recent car, the complete fuel pump system must, sadly, be replaced if the sending unit is suspicious. A fuel gauge that only reads full may be caused by a faulty fuel gauge resistor sending the full voltage to the fuel gauge at all times. If your fuel gauge doesn't work at all or is reporting the wrong fuel level, the problem is either a bad fuel sending unit or a wiring harness issue. You may test various gauges in different ways, so look for the right test technique in a service manual or online. With contemporary vehicles, this usually entails repeatedly pushing the odometer button and turning on and off the headlights; in older vehicles, it usually entails repeatedly turning on and off the ignition. The fuel sending unit consists of a variable resistor, a flow and float arm. I replaced multi purpose relay & gauge quit working. We sometimes link to products in our posts and some of these links may be affiliate links this means should you purchase through the link, we earn commissions. You know theres a problem if you just filled up and your gasoline gauge still reads empty. So the last two fill ups my MY16 Touareg, has not shown full tank on the gauge, even though the tank is full to the brim. Finding fuel gauge problems might be difficult. Gauge problem #2. Never allow the gasoline gauge to fluctuate rapidly or act abruptly. Although it is not very challenging, testing the wiring might take some time. A $15 bottle of PRI-D beats new sending units if the result is the same. TESTED ELECTRICALLY AND NOT WORKING. you will likely want to remove it to replace it with a good used part, a new part, or to attempt to clean it or repair it. . Introduction. Monitoring this will enable you to identify any issues with the vehicle before they become significant ones. In this situation, regardless of the amount of fuel in the tank, the gas gauge wont move. Resistance on earlier automobiles with a 1-wire transmitting unit may be simply evaluated. W140. Those are difficult to troubleshoot in the traditional manner using a multimeter. It did. Checking the voltage at the fuel gauge can be a simple procedure. Start the engine. These systems will need to be tested individually to fix the gauge. One of those crucial meters, if it malfunctions, may leave you stranded or at the least, force you to continually monitor your mileage out of concern for running out of petrol. Base price of a 300D-T: $30,973. In certain instances, a broken ground connection is the cause of the problem. It may be a faulty circuit in one location if the gauge is between midway and full or empty. 1977 W123 dash lights not working. If the power line does not have 12V, you will need to troubleshoot the power issue. Press and hold the start button for 5 seconds without starting the engine. If your fuel level gauge is not reading accurately or the needle jumps around and or your car's low fuel warning light does not comes on, it is usually a problem with the tubular sending unit in the fuel tank. We examine each of these signs of a malfunctioning fuel-sending machine. Heres how to focus your search. This float is hollow in construction and is not heavy. I wanted to see if the sending unit was any good. If the fuel indicator reads inconsistently or says the tank is full for more than 75 miles, there could be a problem. Fuel gauge is stuck on full. Before removing it all the way, let the fuel in the unit drain out. Is there a float on the sending unit? You largely rely on your cars fuel gauge to accurately indicate when you need to refuel while you are driving. Unpredictable behavior and a fuel gauge that reads empty or excessively full are the main signs of a malfunctioning fuel gauge. "THE NON WORKING GAS GAUGE FROM THIS 1967 CADILLAC FLEETWOOD 4 DOOR. Gauges. 1986 Production ceases in January, with 2,696,915 W123 models built. Jul 22, 2006. Optionally, you can use a large adjustable wrench or channel locks though when using tools like this there is always the potential for damaging the top of the fuel sending unit. To figure out which fuse controls the gas gauge, see the owners handbook. #8. However, due to its frequent usage, it is vulnerable to wear. The unit in my 240 is toast, but since I am moving it has already been moved so it it 500 miles away. The data may not be transferred accurately if your automobile has a defective fuel gauge sender. 1984 Diesel models in America are required by law to wear a catalytic converter. They should be the same. If gauge reads FULL then gauge is good . No the gauge us completely dead. Chrome, Explorer etc. Since neither light nor gauge work, its not the sender. The W123 chassis covers 240D's, 300D's, 300TD's, 280E's, and several other models of Mercedes coupes, sedans and wagons from model years 1977 to 1985. On the other hand, a third-generation Chevy Camaros gasoline sending unit may be reached without removing the gas tank, while the fuel gauge is simple to reach after removing eight screws. It will sometimes blip a bit but then nothing. Under the hood of certain cars is a fuse box as well. Item specifics. Without it, you would have to rely on the cars fuel capacity to bring you home. There may be a problem with the fuel gauge, the sender, or the wiring in between if the fuel gauge consistently displays the readings empty, full, or any other random, nonsensical reading. Instead of spending $2000 on the car I chose to purchase a used cluster on ebay out of a 2011 and deal with the odometer issue later. Here is why I think they are. Turn the key switch to ON but do not start . All developed a new symptom of sticky "wacky" fuel gauge past 1/4 full within 3 months of each other. If it goes below half a tank, the needle is stuck at half a tank, and . Here is a more detailed list of the most common causes why your fuel gauge is not working or is inaccurate: 1. If your fuel sending unit has damaged lines, a stuck float, etc. Regrettably, fixing this is one of the most expensive problems. Start by locating the sending unit on your fuel tank. Depending on the distance and style of driving, a working fuel gauge should deplete at a constant rate after a fill-up. Older cars without an electric fuel pump often only have one wire for the sending unit, along with a ground wire that is hooked to one of the sending units screws and grounds out at the frame close by. Electricity is used to power the gasoline gauge, hence functional wiring and electronics are necessary. Before examining the fuel gauge and mailing the unit, take a close look at your car. The three connections on the sender are ground, float, and reserve light . If it doesnt, the fuel gauge itself is the problem. That's right, there is another filter in the tank on your W123! Fuse replacement generally costs between $10 and $20, however, certain specialist fuses can go as much as $100. DTC P0405 Meaning, Causes, Symptoms, and Possible Fixes, DTC P0031 Meaning, Causes, Symptoms, and Possible Fixes, Why Is My Car Losing Power When Accelerating Causes and Fixes, Common Bad Speed Sensor Symptoms Causes and Fixes, DTC P0013 What It Means, Causes, Signs, and Fixes, DTC P0700 What It Means, Causes, Symptoms, and Fixes. First, you must inspect the ground connections. The gasoline transmitting unit or the fuel gauge can be checked in the following step if the fuse is functioning properly. I plugged it into the wagon and manually moved the level unit up and down to see if the gauge followed suit. *NEEDS REPAIR BEFORE USE*. You must visually check the wiring since any break or damage to the ground or transmitting unit wire will affect the gauge. When the second started I became suspicious. Does the needle flicker, even slightly when you turn on the ignition key ? It's a composite float and rarely fails . Remove those and the first aid box lifts out. The fuel gauge itself, the power to the gauge, the fuel sender, the ground to the system, or the fuel sending wire. 12 February 2011 - 9:04am (changed 12 February 2011 - 9:04am) Permalink. Whatever is easiest on your car should be used first. The issues are typically located in the fundamentals. Most of the time, youll need to lower the gas tank to get access to the mounting hole for the gasoline tank sending unit and fuel pump. thanks to you i will be removing the metal and trying to remember if i kept the box. Because of this, I believe the sending units are different. Even though its less likely, this flaw might still be to blame. It doesnt sink since its designed to rest on the fuel surface. @lollygirl, David , Check the wiring/plug by the tank to see if loose/dirty/corroded and if able to check ground wire and loosen and retighten to make good connection, if all looks good the in tank fuel sending unit may be faulty or a bad actuator at the fuel gauge on your dash. Optionally, you can use a large adjustable wrench or channel locks though when using tools like this there is always the potential for damaging the top of the fuel sending unit. Now, on most American cars this would be a bad ground. With the box out, you will see the top of the sending unit where it screws in to the fuel tank. VISUALLY INSPECT THE SENDING UNIT / TEST. A new fuse, which costs $10, or the repair of the fuel gauge sender, which costs up to $800 after work, can fix a problem. A fuel gauge sender is located within your cars fuel tank. The reserve contact will connect directly to ground ONLY when the tank is low. My mom's 2006 W164 has had fuel gauge issues since she got it. The gauge malfunctions when the float snaps or separates from the arm. If you don't fix it, you may run out of fuel some day when the gauge . 4. Sometimes the wire going up and out of the transmitting unit will be destroyed, along with the arm or float. There is also a PRI-G for gasoline as well as PRI-D for diesel engines. Check the fuse for the gauges/instrument panel by removing the fuse box lid. The fuel sending unit works off resistance as a float moves up and down a fragile set of wires inside the float tube that makes up the body of the unit. It's a composite float and rarely fails . Additionally, you may check the continuity between the transmitting terminal at the dash and the tanks connection point. On modern vehicles, disconnect the instrument cluster from the dash then disassemble it if necessary to access the fuel gauge alone. On the first one I replaced the sending unit for lack of anything better to try. The transmitter, though, can be at fault if the resistor isnt the problem. What should I check for first. I have a W123 fuel gauge question. Press and hold the start button for 5 seconds. Costs range from $250 and $800, depending on the make and model of your automobile and the particular sender that you choose. i think i will weld a 1/2" drive socket onto my 1 13/16" socket. I'll check that out. 1) Failure of Sender. It certainly _is_ fused, the fuse # is on the card inside the fusebox cover, it's delicate and easy to break so be _gentle_ in removing it . The gasoline gauge makes use of both electrical connections and a fuse. The instrument cluster is a single, integrated piece of equipment in contemporary vehicles. The sender is directly underneath the first aid kit on the rear parcel shelf, use a stubby #2 Phillips screwdriver to remove the single screw then gently tip the plastic tray up and out, set aside . fuel gauge was working. The units work by measuring the electrical resistance between two wires in the sender. I have a 1989 F-250 460 with dual tanks. . It was the first time a Mercedes-Benz had a friendly face, in comparison to their history to that point of technologically advanced but rather dour and stern-looking automobiles. Clean, then reattach the ground connection after removal. Defective Sending Unit. Between models on W123 Sedan , Coupe , StationWagon , Gas , Diesel ,200 , 250 , 300 etc, etc, it's a lot difference in fuel capacity, now to my question,,, . The wiring near the tank or the transmitting unit is typically the cause of most gas gauge problems. If you don't fix it, you may run out of fuel some day when the gauge is reading a quarter of a tank! If the resistance does not change, the transmitting unit is malfunctioning. If you feel comfortable, you can replace this part yourself and save a lot of money. Good luck. Installation instructions for fuel level senders caerbont automotive instruments ltd abercrave swansea sa9 1sh tel 44 0 1955 gauge sender the ford barn fg2530 70 not working sprite forum austin healey experience car spridgetguru com tech index wiring diagram electrical diagrams chicagoland mg club tips callibration problem xk jag forums hard to . My bet, the ground wire is broken or poorly terminated. Hiya Newbie forum visitor. Low gasoline levels can also cause the fuel pump to gather up sediments, which block the high-pressure fuel pump, fuel injectors, and fuel filter. Most frequently, the issue is with the sender of the fuel gauge. The Actron CP7818 fuel tester works on most Mercedes-Benz and has the required Schrader valve required for MB cars. Everything else in the cluster is fine. Introduction. Its possible that you can solve this issue on a budget. On the way home last night I noticed my fuel gauge was not indicating and appeared completely dead. It depicts an empty tank with nothing visible to read. The fuel level sending unit on the W123's will fail over time. Mercedes-Benz Tech Information and Support, https://www.startekinfo.com/StarTek/outside/12265/disc_2/program/ETM/82_300.pdf. A direct connection will be made to the fuel pump. See links below for more info and trouble shooting ideas. The gauge may appear to be at three quarters, and then only a few minutes later will change to . There is a gasoline instrument issue if the gauge is always at full, zero, or displays other erroneous and inconsistent readings. 1977-1985 Models 230, 240D, 240TD, 280E, 280CE, 300D, 300CD, 300T. My car has been sitting for 9 years and they're sending unit isn't working or the gas gauge does not work. Reply. Before you run out of petrol, lets determine what the problem is. The most common gauge problems are either a bad ground at the tank, or a sender problem. I had put about 11-12 gallons in it about 2 weeks ago to fill it up and the gauge that time showed about half a tank. Lets quickly review the most prevalent causes: A defective fuel level transmitting unit is the most frequent cause of a fuel gauge not functioning properly or being incorrect. CORE FOR PARTS OR REPAIR. Most Manuals are pdf Format and Work with Adobe Reader and Browsers ie. Although it is conceivable, it is not recommended unless you have a clear cause and precise instructions for your automobile to calibrate a gasoline gauge yourself. I don't think it can hurt to try it. They also chose to install a fuel strainer at the main outlet for the fuel tank to keep large particles out of your W123's fuel system. The majority of the cost of repairing this component is labor-related. I didn't think the circuit being fused, however the rest of the cluster is OK. The final price will range from $200 to $400. 1. The water valve on the toilet is currently open, allowing water to flow back into the tank. THE SELLER MENTIONED THE AIR CON DOES NOT WORK, IS THERE A COMMON FAULT WITH. You could count your kilometers with each fill-up, but it would be taking a chance. Visualizing a toilet float valve is the most effective approach to describing the workings of a gas gauge. The wiring . Your gas gauge will inform you of how much petrol is left in the tank and when its time to replenish. W201. Unfortunately, in contemporary automobiles, the fuel gauge is frequently merged with the instrument panel. The fuel gauge is stuck on empty. Now we've discovered that the fuel gauge works for the first half of the tank, but not the second half (the important half). My tachometer doesn't work. Occasionally my fuel gauge jumps left to right and right to left, then resets to correct position. I have a 2008 C300 with ~105k miles on it. The resistance will read 0 ohms when the tank is empty and 30, or 60, respectively, ohms when it is full in the majority of older sending units. Since the instrument cluster is un-fused, be careful when working on it. My theory is that the B20 I switched to was dissolviong lots of old petrodiesel debris from the system and pressumably being lighter, it floating to the top of the fuel. The next step is to check for voltage drop. if I ever decide to sell the car. The gauge reads full after a fill-up because the electrical resistance at the sender changes when your fuel level is full and transmits the signal to the gauge. Disconnect the wiring connected to the sending unit of the fuel gauge and then look at the fuel gauge. Do it slowly. Although less frequently, the gauge might display fully when the transmitter is malfunctioning. 85 300d turbo diesel. Why is the fuel gauge not working? It is a part of the car interior that is mounted on the instrument board in front of the driver. A rheostat meter on the rod that connects directly to the base measures the amount of fuel in your cars tank. The cluster self-test procedure should involve a complete sweep of the fuel gauge needle. The gasoline-sending unit/fuel pump component should typically be removed from the tank for inspection once your wiring and fuse tests have been successful. @lollygirl, David , Check the wiring/plug by the tank to see if loose/dirty/corroded and if able to check ground wire and loosen and retighten to make good connection, if all looks good the in tank fuel sending unit may be faulty or a bad actuator at the fuel gauge on your dash. You have been watching to much Still Game. Driving for a long time with a malfunctioning fuel gauge is not a good idea since it might leave you stranded or cause the fuel pump to gather up too much sediment and overheat. Although it would be lovely, this indicates that something is not right. Gauge problem #1. The gas tank itself is the ideal location to begin. Running out of petrol has various long-term effects on your car, including increased fuel pump wear and fuel pump overheating, even though it may seem like a relatively small nuisance. This is the most common problem since there is a lot of motion inside the unit. There are a couple of reasons that would cause . There might not be enough electricity for the gauge to read accurately if the system malfunctions. The amount of fuel that your vehicles tank can contain in gallons or liters, as well as its fuel efficiency, are both listed in the owners handbook. If the fuel gauge is now showing an empty reading, it means the fuel gauge is faulty and needs to be replaced. The gasoline sending unit is located in the trunk behind a panel held in place by merely four screws, however, the fuel gauge on the fifth-generation Honda Civic is difficult to access. . The fuel gauge may malfunction in this system if the instrument cluster does. Next, the gauge is grounded. The circuits can continue to function if the contacts become worn. From what I understand, wonky fuel gauge is one of two things: Well its not the fuse, they are all good. These gauges can be used to measure the amount of gasoline or any other type of liquid.. When the fuel gauge is merged into the instrument cluster, many contemporary automobiles do not have a separate fuse, although it may be worthwhile to check. By comparing the location of the float to a calibration curve that accounts for the geometry of the tank, modern automakers may utilize a computer within the car to slightly alter the movement of the fuel gauge. The steps in the following guide you through where to start when troubleshooting fuel gauge difficulties, because there may be several sources of the issue. . PART #6458634". Nov 2, 2016 Both times after I filled it up . Make careful to only do this when the car has either very little petrol left or none at all. Instead, a defective resistor is frequently the cause of a fuel gauge that is locked at full. After plugging the new cluster in everything works great except for the fuel gauge. The testing procedure states as follows . As an Amazon Associate we earn from qualifying purchases. HAS NO CRACKS AND NO DINGS. Although the instrument cluster might have an electrical issue, a defective fuel gauge sender is typically to blame. Additionally, there is a device that resembles a float within your gas tank that is linked to a rheostat (or resistance-sweep; picture the volume control on the radio) that interacts with the fuel gauge directly. Car Feels Sluggish When Accelerating Is It a Big Problem? My feeling here is a sending unit has failed in the 36 years and 218,000 miles since it was built. One of the first symptoms of a problem with the fuel gauge sender is a fuel gauge that behaves erratically. The transmitting unit is where the process starts in its entirety. The float contact will have a variable resistance to ground, this drives the gauge. 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