Throwing codes 7E8 and 7E9 A/T
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7th Gear
Joined: Apr 2019
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Throwing codes 7E8 and 7E9 A/T
I did a service change fuel filters oil change and right after I did the service I started and it started then died so I got starting fluid and used it and it started drove 10 miles then the engine light came on and it said low fuel pressure ?
FTE Legend
Joined: Mar 2017
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From: Western NY
One spot to check would be the DFCM, the primary pump, make sure the cap is screwed all the way up to the stops, one on the cap which meets the one on the body.
If the fittings on the secondary filter in engine bay were not tight, there'd be fuel all over but I do believe I read a thread from Ford Doctors about one of the O-rings rolling when that filter was replaced and was sucking air.
Did you do enough priming cycles... turn key to on engine off and allow the pump to run for 30 seconds each time, purging air from the system? I believe the manual says 6 times... I go double that, at least...
Motorcraft fuel filters only, the FD4615 set.
If the fittings on the secondary filter in engine bay were not tight, there'd be fuel all over but I do believe I read a thread from Ford Doctors about one of the O-rings rolling when that filter was replaced and was sucking air.
Did you do enough priming cycles... turn key to on engine off and allow the pump to run for 30 seconds each time, purging air from the system? I believe the manual says 6 times... I go double that, at least...
Motorcraft fuel filters only, the FD4615 set.
FTE Legend
Joined: Mar 2017
Posts: 31,968
Likes: 9,197
From: Western NY
Read this here before... Use fresh engine oil on the cap threads and the new O-ring... Much easier to screw on...
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2nd Gear
Joined: Jan 2025
Posts: 2
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From: Hattiesburg, Mississippi
Engine issues after filter changes
I did the same service and it ran fine until I pressed it a little hard and I got the 7E8 & 7E9 codes. It has happened twice. I get a reduced power message but don't notice anything. The truck is also deleted and tuned. I'm thinking it is one of the position sensors, pedal or throttle.
Last edited by PopsPlatinum; Jan 16, 2025 at 06:36 AM.
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