Fuel Pumps
Ford Thunderbird
Ford Expedition XLT
Ford Explorer XLT

What all can you check when there is no power to the fuel pump when switch is turned on?

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2005-12-06 07:47:21
2005-12-06 07:47:21

In most injected vehicles, the computer determines whether the engine is actually running or being cranked before engagning the fuel pump. Once the fuel is up to pressure many pumps are turned off. You'll need to find an electrical diagram of the vehicle, find the wire that powers the fuel pump and make certain that power isn't comming on briefly when you first turn on the key switch. The diagram will also help you identify the relay that runs the fuel pump and any other relevant information. Good luck. hers a hint that could help ya out..the inertia switch in trunk on left side behind covering is a relay.might need reseting or check to c if its getting power on both wires..it should ..also just behind front passenger headlight you'll see a large blackish module the fuel pump relay is integrated in that..there should be a data link connecter on firewall of passenger side you will see 6 point holes 2 on top 4 on bottom..looking at it with the 2holes on top your gonna want to ground the left one.with a jumper wire if the fuel pump starts to operate with it only being grounded by link connector your most likely defective component is the pcm..power control module..main computer of car.....dont forget to check fuel pump fuse and all main fuses in engine compartment.....when grounding the data link connecter all it does is bypass the pcm itself.and checks the whole fuel pump circuit..relays etc.fuses.so if it does work by doing that and only when doing that the pcm is defective.good luck

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