Question about 1990 Ford F150

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'86 F-150 5.0 EFI

My truck recently just quit running while on hi-way going @65 mph, having no problems prior whatsoever. It will start and idle, but dies when you give it gas. If I gently give it gas, I can move it, but once it starts moving faster, it suddenly dies out again. After it dies, it's hard to start again and shakes like it's timing. I have checked the timing & fuel pressure, both good, & within last 2 yrs. have replaced fuel filter/res., hi-pressure fuel pump,& fuel pressure reg.; new coil, distributor, ignition module, cap, rotor and wires,& battery's good. All vacuum lines and elec. con's. good, so I bought a new fuel pressure reg.(thin diaphrams) and even tried a different fuel pump.No luck. Several people have said it doesn't appear to be the injectors, to me it appears to be starving for fuel when I try to get going, but what do I know? Any suggestions? I even tried Heet in the tank(bad gas?).

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  • Anonymous Mar 20, 2014

    So far we have put additive in the front gas tank, put in new fuel filter, new battery, and a new ignition module. The truck definitely runs better than the 1st time it died on us. The first time it died (on the way home after we bought it), we couldn't get it started at all and had to have it towed to our house. A lot of people have been telling us the fuel pump is bad. Others have said the needle and/or float bowl in the carburetor may be clogged up. Thought we would throw our problem on here to see what people in this community say. For several days in a row, when we were working on her consistently trying to figure out the problem. Once we got her started with the starter fluid, she would start up just fine throughout the day. And when we would drive her, she would drive beautifully until my husband would try to push her hard by putting the pedal to the metal. When he did this, she would die on us immediately every time he did that. Then he would spray some starter fluid in the carburetor and she would start right up and run and drive just fine until he would do it again. My husband had been sick all weekend and he hadn't tried to drive her for several days. He started her up yesterday with the starter fluid and he said she died on him 4 times during a 10 mile round trip. This has been really frustrating for us because we know the issue is nothing major, we just can't figure out what the problem is. We aren't mechanics but we can't afford to take her to a mechanic and we aren't afraid to try and fix her ourselves with help and advice from people who are willing to offer their advice and expertise.

  • Anonymous Mar 29, 2014

    Does not start. Engine turns over. One time it starts and runs great and then the next time it will not start. Recently lost the gas cap. Something to do with gas pressure, pump?

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It can be either bad gas smell the gas if it smell like tekila or alochol, that means the fuel is contaminated with e-85
or if fuel smells ok, check also your last receipt for last fuel purchase and make sure you have not buy any e-85, also check for maf or map sensor and unplug it, if any changes the sensor is bad, also if you have dual fuel thank check the filter in the fuel separator, it is a big plastic hosing where all the fuel lines atached together.

Posted on Aug 21, 2008

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Sound like to me that u are getting air from somewhere one of your lines may be cracked or not tighttend all of the way or you may have overtightghted one of them

Posted on Aug 21, 2008

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