86 f250 6.9 starting but does not stay running
 

my truck i just got from my father in law. will start and run for about 30-60 seconds and die. i have replace the lift pump and put a new injector seal kit on it. so i am wondering if there is something i am missing, any idea?

i know on the fuel system there is a little screw. im pretty sure its right after the injector pump or on it. i did this a long time ago so i dont remember too well. take the screw out and clean it, and then clean the hole its in. i cant remember what exactly it does but i had this exact problem and that cured it. sorry i couldnt give you more. :c:

try to replace your fuel filter mybuddy had the same problem the fuel filter was really dirty. when he was waiting for the wait to start light to turn off the filter was being filled with fuel then when the engine started it would use the fuel in the filter then die out. so i would try replacing the fuel filter:U:

you shoulda replaced the fuel filter first.... as they said, i bet thats your problem...


just for future, any time it feels like its runnin out of fuel, change the fuel filter... its a cheap place to start...

keep a spare in the truck also. good thing to have.

well the filter is new and what not. i checked it. the truck will run if i hold the air bleeder valve on the fuel filter. it seem like it is sucking air in somewhere before the pump

Remove the filler cap on the tank. I bet your tank vents are plugged and the tank is being sucked in.

how much fuel is in the tank?

im not sure if that year would have a vented gas cap, try replacing the gas cap and see what happens, i'm a little curious. :humm:

these tanks are known to break off the pickup tube around1/4 tank. so gauge will say 1/4 tank left, but it is sucking air.

whats the fix on these things

new sending unit in the tank. drop tank, install sending unit and reinstall.

6.9L dies after a few seconds
 

Had the same issue for a while. Found an O-Ring on the return line was bleading air into the system. Replaced and problem went away.

If none of that works , i recently had to replace my fuel lines... due to cracks in the lines near the rear tank.... used gates bio-diesel line... damn thing runs like a raped ape now!!!!!!:jump:.... in fact i have never had a 7.3 IDI run this strong.... now I just need to get the damn thing to slop leakin oil...LOL..... :argh: