Trouble in paradise
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Freshman User
Joined: Nov 2004
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From: Maine
Trouble in paradise
Hey all, my 89 F250 351 was running fine today, I went around a corner and it sputtered a couple of times and stalled. (felt like spark or fuel). After I stopped I was able to get it running after a minute and went on down the road. It started sputtering again, I pulled over and switched to the rear tank and all seemed to be fixed.
Later today, I was driving on the highway for about 8 miles and it started again. I was able to keep it going by feathering the throttle (a couple of times it backfired) and then it ran ok. I tried both tanks, no difference. After raiding the home depot for some stuff, I crossed fingers and went for home. After 5 miles or so it started again, and again I was able to feather it a bit to keep running. I pulled over for 2-3 minutes and started it again and drove another 5 miles home. The truck stalled out totally as I pulled into my driveway. 5 minutes later it started up and ran normally.
When I turn the key but don't start the engine, I hear the pump, however it does not stop after a couple of seconds, it just keeps going. I plan to try the fuel filter tomorrow, any other ideas?
Later today, I was driving on the highway for about 8 miles and it started again. I was able to keep it going by feathering the throttle (a couple of times it backfired) and then it ran ok. I tried both tanks, no difference. After raiding the home depot for some stuff, I crossed fingers and went for home. After 5 miles or so it started again, and again I was able to feather it a bit to keep running. I pulled over for 2-3 minutes and started it again and drove another 5 miles home. The truck stalled out totally as I pulled into my driveway. 5 minutes later it started up and ran normally.
When I turn the key but don't start the engine, I hear the pump, however it does not stop after a couple of seconds, it just keeps going. I plan to try the fuel filter tomorrow, any other ideas?
Mountain Pass
Joined: Oct 2003
Posts: 161
Likes: 1
From: Eastern Iowa
Soinds like the fuel pump or the fuel pressure regulator to me, but I am a pessimist so by all means try the filter first.
I have the same truck and have had to replace all of these parts.
Good luck
I have the same truck and have had to replace all of these parts.
Good luck
Lead Driver
Joined: Nov 2002
Posts: 9,557
Likes: 44
From: Concord, NC
Do you have a tach in your truck? If so, did the rpm's drop off when the truck was acting up? My high pressure fuel pump went out about a year ago, and it would cut out randomly for a few seconds, until finally it went out so frequently I had to get the truck towed. Did it on both tanks too. I think '89 still had the 3 pump system, so the high pressure frame mounted fuel pump might be something to look into. Definitely pull the codes to see if there is anything in the computer about the problem.
Elder User
Joined: Sep 2004
Posts: 941
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If the fuel pump runs continuously with the engine stopped, it is usually a sign that the PCM (engine computer) is not running properly. The computer enables the fuel pump at "power on reset" (key first turned to on). It is supposed to shut it off after two seconds. If the computer "does not boot", it never gets to this task, and the pump keeps running.
Try to get KOEO codes out of the computer. If you can't get any codes (not even a "pass" code), then there are issues with the computer. If you do get codes, there is something funky with the wiring to your fuel pump relay.
Try to get KOEO codes out of the computer. If you can't get any codes (not even a "pass" code), then there are issues with the computer. If you do get codes, there is something funky with the wiring to your fuel pump relay.
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Freshman User
Joined: Nov 2004
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From: Maine
Finally got around to pulling the codes for KOEO and Running tests, here is what I got...
KOEO
87 Fuel pump primary circuit failure when the PCM commandedthe fuel pump on,
voltage was not detected on FPM.
Fuel pump primary circuit failure EEC to ground (Relay Resistance)
32 EVP circuit below minimum voltage of 0.24 volts
95 Fuel pump secondary circuit failure when the PCM commanded the fuel pump on,
voltage was not detected on FPM.
Running
21 ECT out of self test range 0.3 to 3.7 volts
41 HEGO sensor circuit indicates system lean (right side)
Seems like the PCM is ok, I am thinking a problem with the fuel pump given it's always on status and the lean condition. Any other ideas????
KOEO
87 Fuel pump primary circuit failure when the PCM commandedthe fuel pump on,
voltage was not detected on FPM.
Fuel pump primary circuit failure EEC to ground (Relay Resistance)
32 EVP circuit below minimum voltage of 0.24 volts
95 Fuel pump secondary circuit failure when the PCM commanded the fuel pump on,
voltage was not detected on FPM.
Running
21 ECT out of self test range 0.3 to 3.7 volts
41 HEGO sensor circuit indicates system lean (right side)
Seems like the PCM is ok, I am thinking a problem with the fuel pump given it's always on status and the lean condition. Any other ideas????
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From: Maine
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Post Fiend
Joined: Mar 2002
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From: Bonita Springs FL
Sounds like the fuel pump to me. In 89, there was only one high pressure pump, and it could be on its way out. Check the grounds to it as well.
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Freshman User
Joined: Nov 2004
Posts: 41
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From: Maine
Originally Posted by tex94F250
I do believe that andym is correct. Especially about checking the grounds first, though. A bad ground can cause a plethora of annoying issues. Gonna bet on the fuel pump though.
Elder User
Joined: Jul 2003
Posts: 935
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From: TEXAS!!!!!!!!!!!!
oops, waited too long and couldn't edit.
Anyway mine does the same thing. So all my free time for the last 2 weeks has been trying to track down the gremlin. The fuel pump gets power and ground through out the whole time it is running until after it dies. So i'm guessing the ignition system. It seems to be consistent. It will run for 10-15 minutes then just sputter like its out of gas. I am going to pick up a fuel pressure guage when i get my next paycheck, to find out if it has pressure till the end. Then, if it does i'll start looking at the ignition.
Anyway mine does the same thing. So all my free time for the last 2 weeks has been trying to track down the gremlin. The fuel pump gets power and ground through out the whole time it is running until after it dies. So i'm guessing the ignition system. It seems to be consistent. It will run for 10-15 minutes then just sputter like its out of gas. I am going to pick up a fuel pressure guage when i get my next paycheck, to find out if it has pressure till the end. Then, if it does i'll start looking at the ignition.
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Freshman User
Joined: Nov 2004
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From: Maine
I have some time today and will try to diagnose this problem further. My brother in law was with me last time we had a problem and thinks it could be the coil- I will need to check for spark to see.
With code 87 and 95 (both voltage not detected on FPM), it would seem that I may have some wiring trouble...
Any ideas??
With code 87 and 95 (both voltage not detected on FPM), it would seem that I may have some wiring trouble...
Any ideas??
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Freshman User
Joined: Nov 2004
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From: Maine
Originally Posted by andym
Sounds like the fuel pump to me. In 89, there was only one high pressure pump, and it could be on its way out. Check the grounds to it as well.
I replaced my inline high pressure pump yesterday. The truck runs much better after the change, however the pump it still not shutting down after 2 seconds with the key on. I can pull codes, so I think the computer is fine.
When doing the fuel pump, I could not seem to find any ground points. The black wire that runs to the pump disappears into a wire bundle and I am not sure how to check the ground. Is there a relay in there that could be bad?
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Freshman User
Joined: Nov 2004
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From: Maine
Originally Posted by danwink
Digging up another old post...
I replaced my inline high pressure pump yesterday. The truck runs much better after the change, however the pump it still not shutting down after 2 seconds with the key on. I can pull codes, so I think the computer is fine.
When doing the fuel pump, I could not seem to find any ground points. The black wire that runs to the pump disappears into a wire bundle and I am not sure how to check the ground. Is there a relay in there that could be bad?
I replaced my inline high pressure pump yesterday. The truck runs much better after the change, however the pump it still not shutting down after 2 seconds with the key on. I can pull codes, so I think the computer is fine.
When doing the fuel pump, I could not seem to find any ground points. The black wire that runs to the pump disappears into a wire bundle and I am not sure how to check the ground. Is there a relay in there that could be bad?
Ideas?