Fuel pump running continuously with key in run position. Replaced relays,fuel pump,fuel pressure regulator,. Someone told me it's the computer is bad. That it is grounding out the relay and leaving it open inturn the pump keeps running. Any help i would much appreciate .
Help
- Thread starter crowman
- Start date
They may be right if you can unplug the fuel relay and it stops it. Then plug the relay back in, and then unplug the computer wiring plug, then turn the key to run and see if it keeps running or it stops. Make sure to unplug the computer with the key off.
In my 1994 had the same symptom and also running issues, a few years ago
Pulled out the computer and opened it up
2 of the 3 Blue Capacitors were bad, visually, probably all 3
Replaced all 3 of them, cost under $5
Been running great since then
You can see the 3 blue capacitors in this picture: http://www.auto-diagnostics.info/ford_eec_iv
Pulled out the computer and opened it up
2 of the 3 Blue Capacitors were bad, visually, probably all 3
Replaced all 3 of them, cost under $5
Been running great since then
You can see the 3 blue capacitors in this picture: http://www.auto-diagnostics.info/ford_eec_iv
- Joined
- May 18, 2025
- Messages
- 4
- Points
- 1
- City
- Port Angeles, WA
- Vehicle Year
- 1992
- Transmission
- Automatic
I’ve had this issue on a 1992 Ranger 4.0L OHV 4x4 I recently purchased from an auction site.
Main symptom besides the fuel pump continuously running with KOEO is that once I get it running by spraying carb cleaner in the air intake is that it runs super rich. Idles fine, under load it will sputter and die unless I feather the accelerator.
Of course I replaced the commensurate amount of engine sensors related to air/fuel mixture a person who doesn’t know what they are doing is required to do in order to find a solution, but to no avail.
After much research, even though I had a newish Mexican ECM rebuild from RockAuto I decided to have the ECM rebuilt by Keyworks in Richmond, VA (he has a YouTube channel). He replaced a few capacitors. The issue stopped for about a week. I emailed him and he said he stands behind his work and I could return it so he could verify his repairs, I said hold on as I wanted to dink around with it first.
while checking for shorts in the engine bay I decided to pull the fuse going to the fuel pump relay. The engine ran for another 10 seconds or so, then I put the fuse back in and the problem disappeared.
it’s been running fine all day, no engine codes, no problems accelerating. I expect the problem to return, but at least I know how to kick start it now.
Does anyone with electrical know-how think they know what the ultimate solution might be?
Main symptom besides the fuel pump continuously running with KOEO is that once I get it running by spraying carb cleaner in the air intake is that it runs super rich. Idles fine, under load it will sputter and die unless I feather the accelerator.
Of course I replaced the commensurate amount of engine sensors related to air/fuel mixture a person who doesn’t know what they are doing is required to do in order to find a solution, but to no avail.
After much research, even though I had a newish Mexican ECM rebuild from RockAuto I decided to have the ECM rebuilt by Keyworks in Richmond, VA (he has a YouTube channel). He replaced a few capacitors. The issue stopped for about a week. I emailed him and he said he stands behind his work and I could return it so he could verify his repairs, I said hold on as I wanted to dink around with it first.
while checking for shorts in the engine bay I decided to pull the fuse going to the fuel pump relay. The engine ran for another 10 seconds or so, then I put the fuse back in and the problem disappeared.
it’s been running fine all day, no engine codes, no problems accelerating. I expect the problem to return, but at least I know how to kick start it now.
Does anyone with electrical know-how think they know what the ultimate solution might be?
Sponsored Ad
TRS Events & Gatherings
Recently Featured
TRS Latest Video
Official TRS Merchandise
Follow TRS On Instagram
