Question about 1999 Plymouth Grand Voyager

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I check the power going back to the fuel pump but there is no power at the fuel pump

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  • craiger70 Mar 25, 2011

    done that have power at fuse panel but nothing at tank is there any in line fuses or something else that i might have missed

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I am confused if you are checking the power back to the fuel pump ? how far back to the pump?
if you take some wire ( if you know what you are doing ) and jump the pump straight to the battery will it run ( watch electric polarity )
then you know if the pump is working or not.
All modern cars with electric fuel pumps have cut-off switches/ pressure switches.
if the engine failes to start the pump is shut off, if one of these switches or a fuse is bad the pump will not get power.
If the pump is in the gas tank, and you have power up to the tank but the pump will not run - you need a new pump.

Posted on Mar 25, 2011

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  • craiger70 Mar 25, 2011

    which wire is the power wire there are 4 wires going into the fuel pump green (blackstripe0 blue purple and black

  • feestrings Mar 25, 2011

    the power to the pump will only be momentary and when the engine dosn't start and /or the pressure in the gas line dosn't come up the power to the pump is shut off by the Gas Pump relay - you need to check that.-
    so have some one turn the key to start the car as you put your tester/light to the pump power lead and see if you get any momentary power to it.
    four wires?- this is where the meter really comes in Black wires are usually ground in US cars/and brown in europen.
    (set meter to continuity or Ohms) meter Black lead Ground lead to car body. red lead to each wire; one at a time coming out of 4wire plug on the car side -constant power should be gas gauge. - power then off should be pump power. - one lead should ground out completely pump ground. - last wire goes to gas gauge.
    4wire on tank side should show up in pairs- with ohm/continuity meter- you will see two of the wires will show a resistans reading when the meter is connected to them as a pair.

    Two of the wires are going to your fuel gauge, two to the pump.
    one pump wire is ground. i am guessing the black wire.
    you need a volt/ohm meter.

  • James Young Mar 25, 2011

    Craiger70, if you have good power at the fuse the problem is most likely the relay or a faulty safety sensor on the fuel pump. Look in the power distribution box under the hood, your going to see 3 relays. 1 is the ignition relay, one if the fuel pump relay and one is the AC relay. They should be marked. The way this system works, the ignition is turned on power is routed through the fuse panel to the relay, the relay triggers and allows power to the pump. In some models the AC relay is interchangeable with the Ignition and Fuel Pump relays for testing purposes but I don't recommend doing it. The relay should cost about $5 at the parts store. replace it and see if that resolves the issue. If it doesn't i would normally recommend testing the circuit prior to the fuse to eliminate the ignition switch as the problem. You need to have 12 volts going to the fuel pump. If you have had any damage to the rear or side of the vehicle that those wires run in you need to check the wires for shorts. Finally, before you go through all of this, make sure your vehicle isn't equipped with a fuel shutoff switch or safety feature that is designed to cut the fuel pump if the bumpers detect impact. In some cases the problem actually turns out to be a minor impact that wasn't enough to trigger the airbags but it activates the safety feature and the fuel pump is cut. If you have a cutoff switch by pass it completely.

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Check the relay under the hood and the fuse box.

Posted on Mar 25, 2011

  • James Young Mar 25, 2011

    Craiger70, if you have good power at the fuse the problem is most likely the relay or a faulty safety sensor on the fuel pump. Look in the power distribution box under the hood, your going to see 3 relays. 1 is the ignition relay, one if the fuel pump relay and one is the AC relay. They should be marked. The way this system works, the ignition is turned on power is routed through the fuse panel to the relay, the relay triggers and allows power to the pump. In some models the AC relay is interchangeable with the Ignition and Fuel Pump relays for testing purposes but I don't recommend doing it. The relay should cost about $5 at the parts store. replace it and see if that resolves the issue. If it doesn't i would normally recommend testing the circuit prior to the fuse to eliminate the ignition switch as the problem. You need to have 12 volts going to the fuel pump. If you have had any damage to the rear or side of the vehicle that those wires run in you need to check the wires for shorts. Finally, before you go through all of this, make sure your vehicle isn't equipped with a fuel shutoff switch or safety feature that is designed to cut the fuel pump if the bumpers detect impact. In some cases the problem actually turns out to be a minor impact that wasn't enough to trigger the airbags but it activates the safety feature and the fuel pump is cut. If you have a cutoff switch by pass it completely.

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