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Anonymous Posted on Aug 21, 2014

I have a ford aerostar 1995 v6 4.0 engine fuel pump running and won't cut off and i checked the fuel pump pressure and it's ok

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robert wales

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  • Cars & Trucks Master 4,977 Answers
  • Posted on Aug 21, 2014
robert wales
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If its not shutting off this sounds like a fuel pump relay not shutting down the system, as this is what powers up the fuel pump.

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montehammons

  • 5531 Answers
  • Posted on Nov 11, 2011

SOURCE: fuel pump won't run unless engine is cranking, but won't start

Are you sure it's running when cranking? It should have come on when key turned on.
This is for camrys up to year '91. It may apply in your '95, also. Check the 7.5 amp ignition fuse and the 15 amp EFI fuse and the EFI main relay, all located in the fuse box next to your battery. There is also the circuit opening relay tied in to fuel pump operation. It is usually found under center of dash. It is usually not the problem, but it is part of the checks for fuel pump operation.
If your car has a " check connector" or "service connector" (also called a fuel pump check connector) under hood on driver's side near the firewall (a little 1 inch cube with a cap on it), then bridge terminals +B and Fp with a jumper wire. Turn key to on (don't start car). The pump should come on. Listen for fuel return noise from the fuel pressure regulator, and verify pressure in hose from the fuel filter. If nothing, check those fuses above. Here is how power runs to pump: Battery to 40 amp main fusible link-to 15 amp EFI fuse-to EFI main relay-to circuit opening relay-to fuel pump-to ground. Ignition switch and the computer (ECU) work the relays to pass power to pump. Hope this helps some, Randy. Good luck.

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