Question about 1987 Ford F 150

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87 ford f-150 4.9 L. v6 fuel system

1987 ford f 150. Fuel system not responding when key is turned. No fuel pumps working. I think the relay may be working cause I can here it click when I turn the key. Could be ignition relay though. Fuel system not pressurizing like it should. Motor turns over, just won't start. No leaks in fuel line or filter. No fuel pump whine when ignition is on. Tryed both tanks but nothing. 4.9 L. 300 straight 6. Inline 6, whatever!!

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  • Mark Egan May 11, 2010

    Have you measured the pressure on the fuel rail? The fuel pump does not have to run if there is sufficient fuel rail pressure.

    If there is not, you need to figure out why the fuel rail pressure is dropping, like a bad check valve, or regulator.


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If you hear the relay click, but no pressure at all then it would be the fuel pump needing replacement

Posted on Feb 16, 2009

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