Garry Rhinelander

I have a 1999 Ford F150 6 cylinder that will not start except with the use of starting fluid. Once it starts it runs well, however, as soon as it is turned off, it again requires starting fluid to start. We have tested the fuel pressure at the pump, filter and fuel relay and all measured pressures meet Ford specifications. While running we have also put a code reader with no results showing. We have also empied the gas tanks and put in premium gas.

Any suggestions appreciated. Thanks.

f15@

Its probably fuel pump or some thing that letting the gas go back into tank when its off..

rtg143

It's possible that the crank sensor is weak.

sharptp

Tested Fuel pressure at the pump?
Is that the same as testing at the schrader valve on the Fuel Rail

How long does it retain fuel pressure when you are testing? (pressure regulator)
Does it drop quickly or slowly after the key is turned off?

metropolis909

does it start if u mash the pedal to the floor?

Garry Rhinelander

Now that fall is here, it gets dark earlier and I can only work on my Ford on weekends. Thanks for the tips. In regards to questions:

1. Yes the fuel pressure stays on after the key is turned off.
2. No, it will not start when the pedal is mashed to the floor.

Is there anyway to test the crank sensor other than replacing it?

Thanks.

rtg143

Is it a 99 or a 90?