jbuck
Registered User
Looking at a 1987 F-350 crew cab 5 speed 7.3. Truck starts fine and idles good but will not stay running when you take off. Any thoughts. Sounds like a air/fuel leak.
Last edited:
1989 F350 5 speed keeps shutting off
- Thread starter jbuck
- Start date
Lift pump?
jbuck
Registered User
Where is the lift pump on this truck? How much? How hard to replace. Thanks that makes sense.
DragRag
Registered User
Passenger side front on the engine at front cover area. Sounds like either a bad lift pump, plugged filter, or maybe a bad injection pump. Establish fuel pressure, and go from there.
plugged return out of the top of the pump or return system. Raises case pressure and shuts off engine. not often but it does happen.
jbuck
Registered User
I just remembered where it is, thanks, sorry guys i am learning on the job with the fords, the Cummins is on left side of engine. 2 bolts easy fix. He just replaced the LP so i don't think thats it..
finitetime
Full Access Member
I agree with dragrag. Change filter to make sure its not clogged. My lift pump did the same thing. Idle and even ran fine up to about 25mph. Got a new one from Auto zone for $25 or $35.
Air would cause it to idle rough and spit sputter. Air would also make it hard to crank.
Fuel leak test. That much all you have to do is look on the ground.
Air would cause it to idle rough and spit sputter. Air would also make it hard to crank.
Fuel leak test. That much all you have to do is look on the ground.
