Need some help, truck will start and run fine until it reaches operating temperature (180 to 190 degree,s) then it slowly dies seems like no fuel, installed new fuel lines, heater delete, new lift pump. had it restarted once ran good until same thing, reached about 180 slowly stated to die then dies. Have fuel at filter but will not start when engine is warm. Any ideas would be greatly appreciated. thanks

 

It would be helpful to tell us what your truck is and any modifications on it so the guys might be able to help out better!
Do you have a fuel pressure gauge on it so as to be able to know what the fuel pressure is when it's dying out?

 

just an update, i started pumping on my lift pump to prime my system, noticed air bubbles when pushing on the primer pump, pulled line off of pump and put a vacuum on the pump side and it held 12lbs of vacuum, so i figured my lift pump was good to the injection pump, i rigged up a 5 gl can with a hose from the pump, and return to my 5gl can, primed system and it started, did not drive it but setting in my shop getting temp to 195 several times the truck never quit or stumbled and would come to idle just fine, i must have a leak on the new Larry B's fuel tank inlet piping system, but i am concerned why it would run before for about 10 to 15 miles before it would act up. Could a air leak do that. I do not have a fuel pressure guage on it to tell any pressures, the injection pump has a #2 fuel plate, governor springs. the truck has 206000 miles on it will now previous issues until just now with the fuel. I know that not driving it down the road is not a sure test but the temperatures should still be the same. Any ideas would be appreciated.

 

Well, a pressure gauge will not tell you if there is air in the fuel- pressure is pressure, regardless of the medium.

Maybe you could pressurize your fuel tank a bit (5-10 psi) and check for leaks. - Not a foolproof method, because some fittings will seal under pressure and still leak under vacuum..

 

Well i think it,s fixed, the problem was self induced, the whole thing started when i replaced all the fuel lines and pickup tubes on the fuel sending unit module, when i put it back together i mixed up the fuel tank vent with the return line, which then kinked the return line restricting the return fuel inturn i think was causing the injection pump to get hot enough to bind up the plungers and barrels, drove the truck today for about and hour and no problems. lesson well learned double check your work.

 

Now if you could take some pictures and write a little article about your install and the problem you would help a lot of other people...