I have a 99 F150 5.4. 96,000 miles. Been running great, one morning truck will start but shut down in about 5-10 secs. I borrowed a code scanner but didn't retrieve any codes. I have replaced fuel filter, pcv valve. I have checked cam pos. sensor, voltage at fuel pump relay and at fuel pump. If I spray starter fluid in the intake truck will continue to run. PCM, and fuel pump relay working. It's like something is telling the fuel pump to stop? I am hoping I am overlooking something simple and the problen isn't the PCM. Any Ideas?
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There is a filter in the tank attached to the pump. You might have got a tank of dirty gas and it plugged that filter. You can try blowing with low pressure air backwards thru the fuel outlet hose then try running the motor. If it keeps running then you will have to drop & clean the tank & replace the pump cause the filter will clog up again real soon.
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