Question about 1996 Ford F150 Regular Cab

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Ok, here goes. I've been fighting this "intermittent" problem for a year. I see other similar problems on the net but no real solutions. My truck is a 1996 F150 4.9L 6, 2wd, 5 speed. It will crank and not start MOSTLY in the afternoon. No really, I'm serious. I can walk away and leave it alone for a couple of hours and nine times out of ten it will start. When it starts, it's like nothing ever happened. Runs fine and doesn't miss a beat. Starts OK in the mornings, and at noon when I go to lunch but won't in the afternoon. Doesn't matter which tank I select. The fuel pump comes on for a couple of seconds and you can hear the relay kick it off. It acts like it WANTS to start because the truck is shaking when the starter is turning but it won't "catch", if you will. Maybe like it isn't getting enough fuel. I don't have anything to check the fuel pressure but I would think that if it was the pump, I would have driveability issues and I have none. Just doesn't want to start sometimes. In the past year I've replaced the battery, the ignition module, the coil and the crank position sensor, the ignition switch and the fuel pump relay so far. No codes on the ECM, no check engine light. I took the idle air control valve off and cleaned it up as well because that's what Ford told me over the phone. In the time I've been dealing with this, it might go for a month at a time without problems. I really don't want to take it to a dealer because they'll slap an ECM or a MAF sensor on it and tell me that it's fixed and that won't be it and I'll be out that. I guess I don't have much of a leg to stand on though because nothing yours truly has tried has been the fix either. I'm just hoping that someone might steer me in a direction that no one else has yet. I just don't want to jack it up and put a new truck under it. Any ideas?

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Kind of a strange problem, we usely see this kind of a complaint on a cold start, usely first thing in the mooring, i think what you have going on is there is no fuel pressure when you try to start the engine, hear are a couple things you can try, next time it fails to start try to cycle the key on for 5 seconds off 5 seconds on 5 seconds off 5 seconds on 5 seconds what you are doing is charging the fuel rail if the truck starts then check this things in this order first you need a fuel pressure reading the pressure should be 36 to 42 psi if it is to low pinch off the fuel return line if the pressure goes up replace the fuel pressure regulator if with the fuel return line pinched off the pressure does not go up the you need to replace the fuel pump and by the way there is one in each tank.

if after you cycle the key to charge the fuel rail the truck still will not start,try holding the gas pedal to the floor and see if the engine will start if it does then what you have is called a hot fuel soak caused most times by a leaking fuel pressure regulator, or a dripping fuel injector.

remove the vacuum hose from the fuel pressure regulator, if there is any fuel in the hose replace the regulator. if no fuel in the hose suspect a dripping fuel injector.

also one other thing check the electrical plug in on the fuel tank switching valve we have seen a few of these get corroded and not allow the fuel pumps to run and after you switch the valve a couple of times the connector will make contact again and the pumps will run, this one can be a pain to find, allot of the time you can just unplug and re-plug the valve and it will cure the problem.

this will give you a few things to try, if after trying this things you still have the same problem, get back with me and i will tell you how to check the ignition system, but i think it will be a fuel problem.....good luck

Posted on Apr 04, 2011

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