Question about 1997 Mercedes-Benz C-Class

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Car will not start has no voltage at fuel pump but pump will work

Could this be a relay ? I have checked fuse in the car and all are good

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  • Anonymous Mar 26, 2014

    no power to fuel pump fuses and relays are good



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Get your spare key,try to start,or try to synchronize your car

Posted on Mar 19, 2009

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Check your fuses and relay,,if it runs with external power then the fuse is out. Have you checked for a shut off switch for that car?May need to reset if you have one.

Posted on Mar 11, 2009


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You say the fuses and relays are good.
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Fuel Pump Problem on 90 S10 Blazer

Hi there, i have a guide that will help you troubleshoot this device. its a step by step situation that will help you find the issue with your fuel pump functions.

tep1 Go to the back of your car and take off the fuel filler cap. Ask an assistant to turn the ignition on but do not start the engine. Listen closely for a brief, vibratory sound coming from the tank. If you cannot hear the sound, go to the next step. Step2 Check the fuel pump circuit fuse. It should be in the fuse panel under the dashboard or in the engine compartment Verify that it is in good condition and the contacts are free from corrosion. If necessary, replace it and test the pump again. Step3 Inspect fuel lines, hoses and connectors. Make sure hoses are not torn, bent or obstructed. Verify there are no gas leaks. Step4 Locate the fuel pump relay. You might find it in the engine compartment, at the driver or passenger side and close to the windshield or at the front of the engine as part of a cluster of relays. Another common place is under the dashboard. Step5 Remove the fuel pump relay. Ask an assistant to turn the ignition on but do not start the engine. Using a test light, check for incoming voltage at the relay connector. If there is no voltage, check for an open or short at the wire between the relay and the fuse panel. Step6 Jump the relay connector to apply battery voltage to the fuel pump. After the jumper wire is connected, ask an assistant to turn on the ignition while you listen for fuel pump operation as described in step 1. If the fuel pump works now, replace the relay and test again. Another alternative is to test the fuel pump relay for proper operation. Step7 Locate the fuel pump connector at the back of the car and check for incoming voltage with a test light. While you check for voltage, ask an assistant to turn on the ignition but do not start the engine. If there is no voltage, check for an open or short at the wire between the relay and the fuel pump. Step8 Check the power and ground connections at the pump and make sure they are good and free of corrosion. Step9 Test the fuel pump. Apply direct voltage to the fuel pump. If you cannot easily remove the fuel pump through the trunk of your vehicle, you might want to take a fully charge car battery to the back of the car. Raise the vehicle and secure it firmly on jack stands. Unplug the fuel connector and use a couple of jumper wires to connect the battery to the fuel pump. If the pump does not work, replace it.

Please rate and god bless:)

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