I have a 1987 F250 302 4spd 4x4.

I am having fuel problems with this truck. Sometimes when you go to start it, it runs like a champ, but more often that not, it won't start. When it does start, it will run all day without any problems until you shut it off, then nothing.

It has no fuel pressure to speak of at the Shrader valve. I get an all clear code from the computer. I changed both in tank fuel pumps, the high pressure frame rail mounted fuel pump, the fuel filter, the fuel pressure regulator. All with no luck. It fires on ether, but it won't run on its own. The fuel pumps are running, and I disconnected the fuel line at the fuel filter, and there is plenty of pressure and volume there,

Please help. I am getting ready to shoot this truck.

If anyone wants a good deal on a F250 plow truck with liftgate, located in Connecticut, let me know.

 

Well, there's only one component you haven't replaced... the dual function reservoir. It's bolted to the frame rail near the fuel filter and it sits behind a steel shield/plate. (Single function reservoir if you only have one tank.) That's the part that acts like a fuel buffer and as a switching valve to select one tank or another.

 

You could have a line problem plugged or kinked or the fuel tank switch (pot on side of frame before high pressure pump) is bad and not switching. Is is supposed to switched by the low pressure pump in the tank. Or your new huih pressure pump is bad.

 

Fuel is being drawn from the tank, and pumped at high pressure at the fuel filter, so that would eliminate the low pressure and the high pressure fuel pumps as being the culprit.

If fuel is being drawn from the tank, and the switcher is before the high pressure pump, it would seem that the switcher is working?

Any thoughts?

 

Well vee-eight I can tell you this much, I’m having a similar problem. I quit driving mine about a year ago when it started shutting down out of the blue. I have replaced one low-pressure pump and the high pressure pump. The selector valve is new and I replaced the pump relay along with the computer relay. Sometime I could jump in it and it would start and run for a few minutes, and then other times it wouldn’t even start. Today I hooked a fuel pressure gauge to it and watch it. It was running for about 15 minutes, just idling, and then the gauge gave a few flickers and went to 0, it died. This happened on both tanks, several times today. I have the relays bypassed so that the pumps run continuously. When the pressure went down the pumps were still running. My pressure regulator is about 3 years old so I may replace it next. Here’s the weird part. It wouldn’t start first thing today, (no pressure) so with the pumps running I walked to the back and opened both filler caps, and the pressure started building. This same thing happed before just before I quit driving it about a year ago. But I tried to duplicate today but it didn’t work. I like a challenge but this truck is almost to much. Good luck with yours.