Question about 1991 Ford F150

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Backfire through the intake

I have a 1991 f-150 that smeels of raw fuel ,runs very rogh and the fuel pump will not cycle off.This problem happened insantaniously.If there is any ideas it would be helpful

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This problem sounds like a fuel pump relay that is stuck and will not magneticly release rule out relay cheapest fix

Posted on Sep 11, 2008

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My 93 towncar runs rough cold. it backfires up through intake i replaced plugs, wires and one coil pack, coolant sensor. i read codes 226 and 542. it runs ok warm, but can still hear misfiring, it feels...


YOU HAVE INTAKE MANIFOLD LEAK ALSO COULD HAVE BAD OR STICKING INTAKE VALVES. CODE PO 226 IDM SIGNAL NOT RECEIVED AND CODE PO 542 FUEL PUMP SECONDARY CIRCUIT.

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At that mileage, it's possible that you have one or more injectors that are beginning to leak. When that happens you need to crank the engine over longer in order to clear the raw fuel from the intake and re-pressurize the system as well. Also check the ballast resistor (white ceramic block with two wires going to it) on the drivers fender back near the firewall. I can't remember exactly what it does but do remember that it alters the way the pump operates after warm up.

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My 1999 isuzu rodeo ran out of gas and now it won't start even with 4 gallons of gas. It cranks, the lights don't dim, but it does not even sputter or anything.


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This can clog or plug the strainer so much that it prevents fuel from being pulled up into the fuel pump.

The fuel pump can be damaged by the debris that is pulled up, causing it to fail.

I suggest a pressure test. You can spray a small amount of wd40 or carb cleaner into the intake while being careful, if the vehicle tries to run, then more than likely it is your fuel pump.

Be careful for backfires, you are spraying a flamable product into the intake and any timing problems could cause sparking to create a backfire. Just stand to one side and be careful.

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DC

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