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If your fuel pump is not receiving power it could be because a fusible link or fuse has blown, the fuel pump relay is not switching or the brain (ecu) is not triggering the fuel pump relay. To test it, pull the fuel pump relay and locate the coil prong and switch prongs on the relay. There is usually a diagram on the relay or the prongs are numbered. Prongs 85 and 86 are for the coil and prongs 30 and 87 are for the switch. Figure out ( carefully ) wich leads on the relay mount correspond with the prongs on the relay. Use a jumper between the switch leads ( 30 and 87 ) and have a friend stand by the fuel tank. Turn the ignition key to the on position and your friend should hear the fuel pump start to run. Don't run the pump for more than a few seconds. If it does not come on you have probably blown a fusible link or fuse. Remember to remove the jumper. If it does come on test the signal from your brain by using a volt meter or test light between the coil leads ( 85 and 86 ) on the relay mount. Have your friend turn the ignition key to the on position and the light should light up ( or the volt meter should show voltage ) for a few seconds then shut off. If this does not happen there is no signal from your ecu. If it does happen replace the relay.
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ProfessorElectric fuel pump is mounted to the fuel tank, it spins when you turn the key on when it reaches its needed fuel pump presseure it turns off, goes back on when the pressure drops....get it?? You cvan gear it spinning when you first get into the vehicle, turn everything off close the doors and turn on the key withiout starting the engine it makes noise from the rear of the vehicle.
A couple of quick checks: the fuse for the fuel pump, or a fuel pump cutoff switch. These are the two common methods of relieving fuel pressure before replacing these parts. Also check the fuel pump relay in the fuse block. They are usually identical to at least one other relay in the block (they may all look the same, check the part numbers stamped on them. If the fuse and cutoff are fine, switch the relay out with an identical one from the block and retest.
Also; when you pulled the old pump out, the tank should have been empty or very close, did you remember to put fuel back in the tank?
One other thing; the replacement pump may be defective (it has happened to me twice).
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What could be wrong if you changed the fuel pump of an 86 Cherokee 4x4 and now it is not getting fuel to the injectors?
You may have a bad fuel pump relay or a blown fuel pump fuse.
Will the fuel pump relay stop truck from starting?
Yes, along with many other causes a bad fuel pump relay can cause a no start. The fuel pump relay provides power to the fuel pump.
What can you do if the fuel pump on your 1999 Tahoe has no power?
Check the fuse and the relay. If it's the fuse, and the next fuse blows out immediately, be suspicious of the fuel pump.
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