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Category: Mercedes fuel gauge reset

Welcome to world's most trustworthy automotive forum. Thread Rating: 19 Vote s - 3. Reputation: The car isfacelift model. The fuel gauge on instrument cluster moving all the time to up and down. I checked the wires between rear SAM and fuel level sensor, all 5 wires all ok.

I changed with the modul second hand and fuel level sensor second handbut still same. I can't believe thath the problem is in instrument cluster, because the rear SAM not see fuel level in reservoar. Can someone help me? Edit: Wrong part number of rear sam module. How this all started? After what was done? Check the coding of rear SAM. Reputation: 7, Maybe its the SAM It self Best regards. The customer bought the car with dead Rear SAM - the diagnostic not reading rear sam, not working rear panel door locking and etc.

After change it, now everythink working without fuel level sensor Yes, First I said I checked actual values in rear SAM, and then have onlynot values. I changed with other second hand SAM but still same.

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Junior Member. Reputation: 4. If I recall right, there is an option for two different fuel level sensors, see that right one is coded to SAM. Replacement SAM is same number or compatible as original? Reputation: 0.

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Modify same. Reputation: 6. Do the rest of the control units in the car work correctly? Any network faults? Thank You. It was the wrong part number of rear sam module. After put the correct rear sam, all working correctly P.If you find your car surging or stuttering you may have a faulty fuel pressure regulator.

Changes in the fuel pressure can affect the power and performance of the engine and can be potentially dangerous. Don't get caught at the side of the road with an empty tank even though your gauge says full. The fuel tank sender is used to measure the amount of fuel in the fuel tank and send an electrical impulse to the fuel gauge. If your fuel gauge is starting to give incorrect readings, it's possibly this sender. In modern cars the tolerances in fuel pressure in your system can be very tight.

The fuel pump needs to be able to send a certain volume of fuel at a certain pressure constantly. If you are having issues with the performance of your engine you may have a fuel pump going bad. No Longer Available. All Search Everything. Mercedes-Benz E-Class W Fuel SystemPage 3.

Fuel Pressure Regulators If you find your car surging or stuttering you may have a faulty fuel pressure regulator. Brand Rating. Click for More Info. Fuel Pressure Regulator. Fuel Pressure Regulator 1 customer review.

Fuel Level Senders and Sensors Don't get caught at the side of the road with an empty tank even though your gauge says full. Fuel Level Sending Unit Left. Fuel Pumps In modern cars the tolerances in fuel pressure in your system can be very tight. Use this high-quality fluid transfer pump to remove old fluid from power steering reservoirs, brake fluid reservoirs or differentials that do not have drain plugs as on many later model BMWsor to fill transmissions, differentials, and any other assemblies when changing the fluids.

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Back to Home. In some case, top of the range VDO fuel gauge might be supplied with built in calibration function but most of the kits are supplied with matching sender unit to save the hassle of calibration.

However sometimes it can be more hassle to change out the sender unit to make it fit on the original fuel tank. In principle, the fuel gauge is an Ohmmeter with a indicator dial showing Full-Empty scale printed on it rather than a resistance read out. There are 2 situations whereby the fuel gauge does not read correctly.

Out of Calibration Reason 1 The resistance range of the sender unit is wider than what gauge can indicate.

Commonly used configuration is that when the fuel level is full the resistance will be low and resistance value increases as fuel level decreases in the tank. The way to fix it is this. Purchase a potentiometer with Ohm and good resolution with at least 3W rating and connect between the the fuel sender unit terminal and ground as shown in the diagram below.

Most cases the easiest way to do it is to splice the wire and join the wires together. It can also be soldered to the instrument panel however it is not always practical to pull out the dashboard so take your time and make sure to set it up correctly before you reassemble the dash.

When you calibrate make sure that it is done when the engine is running at least rpm and alternator is in charging mode. R2 will be so small even at R2 in full deflection at ohm R total will still be tiny That will require some modification to the sender so that it will be definitely 0 ohm when it is supposed to be In that case Since you are dealing with flammable liquid you probably don't want to mess it either. So please do not take this as some kind of definitive guide Good luck with your project anyway.

Out of Calibration Reason 2 If the resistance sensing range is wider on the gauge than the fuel level sensor wich is the reverse of above. What normally happens s that the gauge will read half full even though the tank is nearly empty in which could cause some problem when you are on a public road.

This is due to the fact that the fuel sensor sender unit is letting through too much current. However it can be fixed by bypassing the 12V terminal and the sender terminal with a same 1k - 0 Ohm potentiometer with minimum of 3W rating.

Calibration Method Once the potentiometer has been installed in place the you can now empty the tank to find your empty read out.A stuck fuel gauge on your vehicle can not only be annoying, but also require you to keep track of how many miles you've driven since your last fill-up to prevent you from running out of gas. A fuel gauge works through a series of electrical connections from the sending unit to the gauge cluster, and when one of these connections malfunctions, so does the fuel gauge.

With a few basic tools and a lot of patience, you can troubleshoot the problem yourself and avoid a costly repair. Turn the ignition on and off a few times, and watch the needle on the fuel gauge to see if it moves. If it doesn't, you most likely have a blown fuse that needs to be replaced. The fuse box will either be located under the driver's side dash or in the engine compartment, so consult your owners manual to pinpoint the location so you can replace the fuse. Test the grounding wire on the fuel tank's sending unit, which is attached to your vehicle's fuel tank.

To do so, attach the negative jumper cable to the car's frame, and the positive jumper cable to the grounding terminal of the sending unit. If the fuel gauge works when the jumper cables are connected, then the grounding wire on the sending unit needs to be replaced.

Disconnect the wiring attached to the fuel sending unit and then look at the fuel gauge. If the gauge is now giving you an empty reading, the fuel gauge is faulty and should be replaced. If the gauge gives you a full reading, the sending unit is faulty and should be replaced. Verify that all of the wiring is securely connected to the back of the fuel gauge, which will require you to remove the dashboard to gain access to the instrument cluster.

The process for doing this varies from vehicle to vehicle, so consult your owners manual. Check the grounding wire on the fuel gauge. To do so, connect the negative jumper cable to the vehicle's frame and the positive cable to the fuel gauge's grounding terminal. Turn the ignition to the on position and look at the fuel gauge.

How to Reset a Fuel Gauge

If the gauge is not working, then the grounding wire needs to be replaced. This article was written by the It Still Runs team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information. To submit your questions or ideas, or to simply learn more about It Still Runs, contact us.

Step 1 Turn the ignition on and off a few times, and watch the needle on the fuel gauge to see if it moves. Step 2 Test the grounding wire on the fuel tank's sending unit, which is attached to your vehicle's fuel tank. Step 3 Disconnect the wiring attached to the fuel sending unit and then look at the fuel gauge. Step 4 Verify that all of the wiring is securely connected to the back of the fuel gauge, which will require you to remove the dashboard to gain access to the instrument cluster.

Items you will need Jumper cables.

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About the Author This article was written by the It Still Runs team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information.My Mercedes Fuel gauge does not seem to work, it has a full tank but the gauge registers as empty yet sometimes it works? Any ideas as to fault and the solution? I've driven both, a 08 C Luxury and a 08 IS I live in the US.

mercedes fuel gauge reset

Both of those cars are fantastic, but it depends on what you're looking for. The C class will save you some petrol, and will be a bit more flashy.

[Solved] W203 Fuel gauge problem

The Lexus, believe it or not, was actually a lot of fun to drive, and the interior was nice as well. The fuel economy is not bad. The thing is, the Benz is roomier, has a better ride, and a better interior.

Bear in mind, I'm a Lexus fanboy, and my last car was a Lexus. I'm not being biased.

mercedes fuel gauge reset

The only real issue I can think of with the Benz is reliabilty, especially since its the first year of the W body style. Like I said, both are fantastic cars, and you cant go wrong, but if you are keeping the car past its warrenty period, I'd have the Lexus.

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If you are selling in about 4 years, I'd get the C class. Enjoy the new car. How old is your Mercedes C-class, if it is a newer model then it may be a major electrical fault and may require the dashboard to be taken out. This has happened to me, it was a huge job. Check them both to find out where the problem is. You have a bad fuel level sending unit.

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It's a common problem in C-class cars.Note: The online Owner's Manual is the latest version available. Deviations between this manual and items specific to your vehicle may occur since Mercedes-Benz constantly adapts its vehicles to the latest technology and modifies design and equipment.

mercedes fuel gauge reset

Please note that this online Owner's Manual does not under any circumstances replace the printed Owner's Manual which is supplied with the vehicle. You will find a full overview of the instrument cluster in the "At a glance" section more. You will find information on the engine oil level check in the "Maintenance" section more.

You will not then be able to see information about the vehicle status, such as speed, outside temperature, warning and indicator lamps, display messages or the failure of systems. Handling characteristics may be affected.

Fuel gauge

You should therefore adapt your driving style and the vehicle speed accordingly. Contact a qualified specialist workshop immediately. The workshop must have the necessary specialist knowledge and tools to carry out the work required. In particular, all work relevant to safety or on safety-related systems must be carried out at a qualified specialist workshop. Only operate the adjustment buttons on the instrument cluster when traffic conditions permit.

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You would otherwise be too distracted and could cause an accident. Do not reach through the steering wheel to operate the adjustment button. The movement of the steering wheel would be significantly impeded. It would also distract you from traffic conditions.

mercedes fuel gauge reset

This could cause you to lose control of the vehicle and lead to an accident. Do not rest your head or chest on the steering wheel or the dashboard when operating the adjustment buttons.

You will find page references for further information in the index under "Airbag". In some countries, a warning sounds when the vehicle reaches the maximum speed limit, e. The speed can also be shown in the display. You can find information on the digital speedometer for vehicles without steering wheel buttons under more and for vehicles with steering wheel buttons under more.Common to almost all models from the 's to the early 's.

Ever run out of fuel and you just knew your fuel gauge was reading at least a quarter of a tank. If you have an old diesel at least carry some spare fuel in the trunk. The problem could be caused by a faulty sending unit located in the tank, corroded or loose contacts on the wiring plugs, or a bad actuator at the fuel gauge on your dash.

Start by locating the sending unit on your fuel tank. On the or chassis is is located under a plug in the center of the trunk floor. Same on the wagon On the chassis sedans and coupes it is located under the first aid box.

On the chassis it is located under a large plastic plug on the left side way under the rear seat back. The back of the seat must be removed to gain access.

If the problem persists after cleaning the plug contacts, remove the fuel tank sender for inspection and cleaning. Tip it up and down to see if the float is moving up and down inside the top. Try sloshing it in diesel fuel.

You can take it apart but you risk the possibility of damaging it. Resistance figures are available from factory information but we can not supply that. If you are sure the sender is working properly then the problem may be at the gauge.

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The actuators can be replaced if you know the procedure. Inaccurate or Erratic Fuel Gauge. This could be caused by one or even a combination of three things. W W W W W Sedan. W W Coupe. Check our related products as we sometimes have good used fuel gauge actuators for sale.


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