1992 F250 5.8

Love the truck, and think I'm almost got it to running the way it should.

The engine was rebuilt at 146k miles, it now has 193k miles, but it has set a few years.

I got it from a long time friend and Army buddy.

I changed the TPS, and EGR valve and sensor due to codes and it is running great on flat roads, but using tons of gas.

But on hills it has no power and bogs down, and slows down.

I was told to use the rear tank, and use it exclusively for now, and am centering all attention to it for now, the pump pumps fuel when you turn the key on without engaging the starter, and idles fine, and cruises fine, except for when any load is placed on the truck.

I put some gas in the front tank (2 gal) but the pump is gone, and now that the gas has been sloshing around it smells like varnish, I shall drop the front tank later and clean it and replace the pump, etc...

In the morning I am renting a fuel pressure test kit with all the whistles, and hopefully find that I need to replace the fuel pump and the fuel pressure regulator, might as well for another $20.

I've never done this, ( the pressure tests that is) are there any potential difficult things to expect, etc?

Thank you.

Hope it runs like a workhorse tomorrow or Wed.

 

Nothing difficult. Connect the gauge to the test port on the fuel rail, start and run the truck on the pump you want to test, and read the pressure.

Pull the line off the fuel pressure regulator (or go wide open throttle real quick) and make sure the pressure goes up. If it drops or stays the same, then either the pump is failing, the strainer or fuel filter or both are plugged, or you have a crossleak into the other tank.

 

Thank you very much, will update.

 

You can still have a "passing grade" with the tests you describe but still have a weak pump. Rig up the gauge so you can observe it during real world driving conditions. Run the truck under various conditions to verify it never drops at WOT or under load below the 35-40+ PSI range

 

thank you.

 

Successful, failed the test with about 30 pounds of pressure, a long day, a new fuel pump, and some redneck engineering later and hills at speed are no problem.

 

Glad you got it going. Thanks for the feedback!

 

Thank you.