Question about 1986 Ford F150 SuperCab

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How do i get a 1986 ford f-150 with a efi 302 (5.0) engine and auto trans to restart after running out of fuel?

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  • revlkcarlson May 01, 2010

    I have poured @ 6-7 gal. of fuel in tank. I have done what you suggest until my fingers are sore. My Chiltons Manual says that 10-13 gal. should be used to pressurize and restart after intank fuel pump replacement (no mention of any amount of fuel when replacing on frame fuel pump). I can get a great flow out of pressure release valve (seems pressurized to me), but still won't run. Fires, seems to want to, but... Plugs appear dry, I just don't get it. Maybe I should just put the Slave Kit in the trans of the Chev... That might be a better idea, this has me stumped and it's probably something real simple.

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When you turn on the key, the fuel pump starts and runs for one second. Under normal circumstances this is long enough the bring the fuel pressure in the fuel rails up to spec. But it is not long enough once you run the fuel system dry. The easiest way to remedy this is to turn your key on and off six to eight times with 2~3secs interval. If there is no problem in the system, this will get the fuel pressure up in the rails and the engine will start.

Posted on May 01, 2010

Testimonial: "Thank You, I'll check pressure tomorrow. Seems when it was coming out threw release valve there was plenty, but..."

  • woozie38 May 01, 2010

    The sysmptoms you describe are an engine starving for fuel. So, if your fuel filter is not clogged, and your fuel pump is running, the injectors should spray and the engine start. We'll assume there is not enough fuel to start. Possibilities are..,
    1. Fuel Filter restricted
    2. Fuel pump relay faulty not turning the pump on
    3. Fuel pressure regulator returning too much fuel to the tank.
    4. ECM not triggering injectors
    5. Air flow meter faulty.
    I think the first thing to do is test the fuel pressure in the fuel rails. they should have a fair pressure between 30 & 40 PSI.
    If that tests ok, get back here and we'll take it from there.



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Put at least a gallon of gas or two in the tank, turn key to on position and listen for the fuel pump then turn the engine over for about ten seconds if it doesn't start then repeat steps one and two.

Posted on May 01, 2010

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