I HAVE A 2002 F450 7.3 DIESEL I HAVE A PROBLEM I CANNOT FIGURE OUT MY TRUCK STUMBLES AND WILL NOT ACCELERATE AND HAVE THE HARDEST TIMES GOING UP A HILL I CANNOT CATCH SPEED ITS SHAKES SPUTTERS AND REFUSES TO GO. LIST OF THINGS I HAVE DONE IS CLEANED TANK NEW SENDING UNIT IN TANK NEW FUEL PUMP NEW FUEL FILTER NEW FUEL PUMP REGULATOR NEW VALVE COVER GASKETS ADN HARNESS NEW ICP NEW IPR I AM LOST AND DONT KNOW WHAT ELSE TO DO ALSO TOOK OUT ALL INJECTORS AND PUT NEW ORINGS ON THEM AND INJECTOR TEST SAYS ALL INJECTORS ARE GOOD ONLY CODE WILL SHOW UP IS LOW BOOST

 

Reading all that I was thinking you must have a big boost leak.... Then I read that it's throwing a code. Have you checked for boost leaks? Is there a lot of spot under the hood? Check all boots make sure there clean with no rips and tears and tight

 

is the truck empty and will not go?
ether you have low fuel psi, low oil psi, no boost, bad injectors, low compression.
dose it start fast? does it blow smoke when you are loosing power?

i would check the fuel psi just to see where it is.
second i would check the hpop psi it may be weak.

 

I HAV LOOKED FOR LEAKS COULD NOT SPOT ANY I THOUGHT ABOUT CHANGING HPOP TODAY BUT WAS TOLD IT COULDNT MAKE MY TRUCK ACT UP LIKE THAT OR MAKE IT STUMBLE I KEEP GETTING TOLD FUEL HAS TO BE IT BECAUSE THE HILLS CAN TRIGGER IT EVERYTIME

 

IT DOES NOT SHOOT ANY SMOKE EVEN WHEN IT IS STUMBLING AND REFUSING TO GO DO YOU THINK IT COULD BE INJECTOR PUMP

 

no smoke i say your boost is fine, sounds like low fuel psi or low oil psi.
it could be the injectors, have you looked at the oil flow form them to see if some are weak?

 

It could be anything. Fuel/air. You can't just look for a boost leak! Make a boost leak detector... Tell us a little more about your truck you have us limited information. Does it have gauges? If so what kind of boost are you making? Is it tuned? Have you checked fuel pressure?

 

how do you make a leak detector for boost

 

Wat do you think left that could make me have low fuel psi with all the things I have changed

 

I had the exact same symptoms as you, and considering you were messing around in the tank, my guess is that you made the same mistake as me. When I did my hutch mod I accidentally swapped my pickup line with my return line on the cap of the tank. Therefor I was trying to suck the amount of fuel a 3/8 hose could support out of a 5/16 line. Once I dropped the tank and switched the lines back, all problems were solved.
My $.02

 

https://www.ford-trucks.com/forums/1...ctor-pics.html

 

That's a great piece of information, I would have never considered even the possibility of that happening.

Reps.

 

Thanks, it threw me in the ringer for a while as well. I figured at least it would be another possibility for the OP to check off.

 

Is the line going to the MAP sensor connected? What is the code specifically?

Can you view live data? Look at the MAP and Manifold gauge pressures.

 

Subcribing, just up hill or all the time?