Question about 1994 Chevrolet Silverado 2500

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My truck fuel pump willnot come on and i replaced it also the fuel pump relay switch it look,s the fuel pump fuse has no power help

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  • Anonymous Mar 18, 2014

    truck fuel pump replaced new fuel pump not coming on

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"if this truck has a factory theft deterrent mode" it cuts off the signal to your pump. Take the battery cable off and let sit for 30 minutes, hook it back up now using a "new key" with the resistor pellet in it put it in to the start position, and wait ten minutes now turn off , now see if the doors can be locked and unlocked with the remote fob...close all doors and use remote fob to lock the doors. now using just the key unlock your drivers door. Now give it a shot and see if it will start. sorry but this is all i can come up with right now..what usually most people end up doing is to tow it to the dealer, and they have a special box with your code that resets the theft mode.

Posted on May 10, 2010

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1 Answer

1989 f-250 inertia fuel shut-off switch switch location


This should be in the owner's manual. I found the below on autozone.com, their repair help location:
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When the ignition switch is turned ON , the fuel pump(s) will operate. If the ignition switch is not turned to the START position the PCM will shut the fuel pump(s) OFF after 1 second. The PCM will operate the fuel pump(s) operate the fuel pump(s) when the ignition switch is turn to START position to provide fuel while cranking.
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9.5 volts sounds like the power coming from the gas gauge.
I am showing a relay module with the fuel pump and pcm relays built in along with two other relays. The fuel pump relay should not be accessable. In most cases the pump relay gets power from a 20amp fuse and the computer grounds the relay when needed. Power goes from the pump relay to the inertia switch then to the pump. So the inertia switch should be hot when the pump relay is activated.

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I probably did not get your post clearly.
The pump gets power from the relay in the start mode, then if the engine does not produce any oil pressure the fuel pump power is shut off. That helps prevent a fire in a wreck.
You get about 3 seconds of power to the pump when you first turn the key on, then nothing if the engine does not start.
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Is there a problem with the truck starting ?

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You say you replaced the fuel pump relay switch? The fuel pump relay is located in the passenger compartment on the right side under the dash. Little black box with a 6 pin plug. Replace that and your power to the pump should be restored . Had this happen on mine just last week. The relay actually monitors the alternator, key switch and a couple of fuses and will remove power from the pump if there is a fault. AutoZone stock number is 20550, costs about $50.

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Did you check the fuel inertia switch in the passenger side kick panel ?

The fuel pump is powered :
the fuse to the fuel pump relay.
The fuel pump relay to the fuel inertia switch
The fuel inertia switch to the fuel pump itself.

At the fuel inertia switch in the kick panel, power from the relay is the Dark Green w/ Yellow stripe wire and the pink w/ black stripe wire is the power. from the fuel inertia switch to the fuel pump.

If you jumper the fuel pump relay, you should hear it run. If not pull the fuel pump relay, and check the pins in the relay socket, pin 30 should be the power from the fuse.

50b0c31.jpg

If you have power at pin #30, jumper the relay socket as shown with the red line above, and check the dark green w/ yellow stripe wire at the fuel inertia switch for power.
Press the button on the top of the fuel inertia switch, and check for power leaving the fuel inertia switch on the pink w/ black stripe wire.

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https://www.fleet.ford.com/maintenance/owners_manuals/default.asp

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