Hey guys my 7.3 runs strong and idles smooth but when it's run over 1600-1800 rpm it falls flat on it's face unless you feather the throttle down. The ip and injectors are under a year old and the lift pump and fuel filter is only about 6 months. Looked for leaks in any fuel lines and was unsuccessful. Any help anyone can give is greatly appreciated

 

check you feed pressure from your lift pump. needs to be 5-7 psi./

 

I went ahead and changed the lift pump this morning and nothing has changed I would assume I'm getting enough pressure from a new pump but I can try to find a gauge to make sure

 

new pump dont mean anything, expecially if it is an airtex pump.

 

Went ahead and pulled the injector pump cause I couldn't find anyone to test it one the truck. Took it to the local diesel shop it tested bad so I'm getting it rebuilt and hopefully thrown back in the ol truck pretty soon

 

wow..... hope that was the right fix for the problem.... some shops will hose ya ... oh yeah its bad $$$$$$....

 

So far it's been runnin decent I changed some return lines cause they were leaking but I think ones still seeping some air into the fuel so I just gotta change em all

 

so u replaced you IP.... did you have them pop test your injectors to make sure that there all firing around the same pressure.... ......almost like changing oil and not the filter ????