1988 Ford Bronco No Fuel Pressure

FORD BRONCO
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THADE
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  • 1 POST
I have a 1988 Bronco, went to change the tires and afterwards it would not start, turns over fine. When key is on, fuel pump keeps running, did the tests and my book said to replace it and i did replace the inline hi pressure pump. the low pressure in tank passed the test. But it is still doing the same thing. It just keeps running without building up pressure. Wondering if is the fuel regulator or the fuel reservoir any help greatly appreciated.
Apr 3, 2006 at 4:17 PM
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PEPPERMRJ
  • ✓Experienced Mechanic
  • 1,158 POSTS
The PCM should shut the fuel pump off after only 1 or 2 seconds if the ignition switch is left in the on (not start) position. Check the igniton switch and lock cylinder. If they are loose and sloppy replace them.

Do a fuel pressure test at the rail. 30 lbs @ idle if memory serves me. If low/no pressure check the fuel lines for kinks/restrictions. Check the fuel filter for flow. Check that the fuel tank is vented properly (remove the gas cap).

If that's good, the next step is the pressure regulator. Any excess fuel supplied by the pump passes through the regulator and is returned to the fuel tank via a return line. Check the vacuum line for fuel.

Good luck and let us know. :)
Apr 6, 2006 at 8:40 AM
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Suggested Repair

Check the ignition switch and lock cylinder, since the pump should shut off after 1–2 seconds with the key on. Test fuel pressure at the rail (about 30 psi at idle), and inspect the lines, filter, and tank vent. If those are good, check the pressure regulator and its vacuum line for fuel.

Conversation Summary

A 1988 Ford Bronco cranks but will not start after a tire change. The fuel pump continues running with the key on and does not build pressure, even after the inline high-pressure pump was replaced and the in-tank low-pressure pump passed testing. The expert advised checking the ignition switch and lock cylinder, testing rail pressure, inspecting the fuel lines, filter, and tank vent, then checking the pressure regulator and its vacuum line.

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