no power to pump

[89 5.0stang]

Have replaced pump and the relay under drivers seat. have power to reset button in hatch, but no power in connection going to pump. wiring seems ok wat could be wrong

[gt90stang]

Originally Posted by 89 5.0stang

Have replaced pump and the relay under drivers seat. have power to reset button in hatch, but no power in connection going to pump. wiring seems ok wat could be wrong

Sounds like the inertia switch is either tripped or bad. Test for voltage on both terminals. There is also a connector at the rear of the vehicle under the car behind the fuel tank check that. There is also a connector under the hood on the drivers side for diagnostic testing that has a pin you can ground to make the pump run, it's the big connector end pin with a wire going to it. This is the pin the PCM pulls to ground to activate the relay and run the pump.

Good Luck, Don

[89 5.0stang]

the relay switch in the trunk is getting power but the connector by the fuel tank isnt but ill try wat u said see wat happens

[EHardy1971]

make sure you have power coming OUT of the inertia switch in the hatch!,power going in,but none going out says either toasted switch,or as already mentioned,it's needs to be reset