I have a 94 6.5 turbo with the pmd relocated. its stalling only at idle everything dies n then itll fire back up easy no loss of power and lift pump is working.i was thinking ops switch but now im leaning toward thr ecm as the culprit. 248,661 miles on her. thanks just need some better ideas so i dont end up buyin a bunch of different parts to find the problem.

 

Any trouble codes?

 

No trouble codes.no service engine light. which im not sure but if it was ecm itd seem like itd throw w code . i also turned the t handle and observed fuel flow it was good. it doesent stall alot just when i idle at a stoplight awhile. but yet it doesent die at idle when the engines cold im assuming bc the cold advance. it has a new pmd and relocated in the grill..i got a spare one as well that i was thinkin bout throwing in to see if thatd resolve my issue.

 

Replace the fuel return line on the IP with clear diesel rated line,then start the truck and watch for bubbles in that line.

I am wondering if there is air in the fuel?

 

Well i believe you were right on the air in line. i turned tv valve while running n drained about a half gallon of diesel it came out in an uneven flow like fast n then slow like there was air until it came out at a constant flow then i tightened t handle n truck idles good hasnt stalled..mustve been from when i replace a return fuel line a couple weeks ago and didnt bleed .

 

Actually sounds more like an obstruction or OPS/LP problem?

 

Well i just ordered a new lift pump relay lift pump and ops switch and fuel filter all ac delco and wix filter. i beleive the current ones are stock except the guy before me did replace the lift pump and filter but probally with chineese junk.

 

Hope you ordered the Delco LP for a 93,they are the best available for stock replacement.

 

Yes sir i did 93 on the pump n 94 on the other parts i used rockauto

 

Good to hear.