1992 E250 5.8 engine dies.
#1
03-03-2011 | 11:12 PM
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Joined: Feb 2011
Posts: 8
1992 E250 5.8 engine dies.
I have a 1992 E250 Van Camper with 40,000 miles. In the last 4 years it has given problems about 6 times when on a long trip. Mostly it fails after driving for hours in the summer heat. Twice it failed while climbing into the mountains in fairly cool weather.
When it fails, it acts like a vapor lock I have seen in old carbureted models. It will die and can be restarted, but run very weakly and die again. After nearly an hour, it will recover and run great, maybe for hours. It failed in Yellowstone park and then returned to Texas with no problems.
The last time it failed, I was able to get a fuel pressure gauge on it. It measured about 20 lbs for a short time and didn't want to start. Then the next time I hit the the starter it went to over 40 lbs, started and hasn't failed since. The low reading was real brief and didn't give me a good feeling It was the issue.
I have no experience with Ford fuel problems. My best guess is to replace the pressure regulator and the filter. Thats less work and money than the fuel pump and seems to be just as good a guess. Am I missing something?
Any help greatly appreciated!!
When it fails, it acts like a vapor lock I have seen in old carbureted models. It will die and can be restarted, but run very weakly and die again. After nearly an hour, it will recover and run great, maybe for hours. It failed in Yellowstone park and then returned to Texas with no problems.
The last time it failed, I was able to get a fuel pressure gauge on it. It measured about 20 lbs for a short time and didn't want to start. Then the next time I hit the the starter it went to over 40 lbs, started and hasn't failed since. The low reading was real brief and didn't give me a good feeling It was the issue.
I have no experience with Ford fuel problems. My best guess is to replace the pressure regulator and the filter. Thats less work and money than the fuel pump and seems to be just as good a guess. Am I missing something?
Any help greatly appreciated!!
#2
03-04-2011 | 05:04 AM
Senior Member
Joined: Jun 2010
Posts: 15,301
I'm speculating here,
when you start the engine the MAP sensor enters an automatic barometric pressure reading for the elevation and fuel is fed accordingly. When you change elevation without turning off the engine for the system to get a new baro reading you can experience fuel problems because the computer is using the old baro reading. Usually all that you need to do is shut the engine down and restart it so it can get a new ,current, pressure reading. Reread your post and see that you did restart the engine.
Fuel filter is always a good place to start.
when you start the engine the MAP sensor enters an automatic barometric pressure reading for the elevation and fuel is fed accordingly. When you change elevation without turning off the engine for the system to get a new baro reading you can experience fuel problems because the computer is using the old baro reading. Usually all that you need to do is shut the engine down and restart it so it can get a new ,current, pressure reading. Reread your post and see that you did restart the engine.
Fuel filter is always a good place to start.
Last edited by hanky; 03-04-2011 at 05:08 AM. Reason: add info
#3
03-07-2011 | 05:40 PM
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When I had the problem after climbing into the mountains, it would not run OK for almost an hour. I started it several times, turned it off and waited. My guess is it is somehow affected by the additional load while climbing.
I have replaced the filter and pressure regulator. With the old regulator, I had 44 PSI without vacuum and 35 PSI with vacuum. With the new regulator, I have 39 PSI without vacuum and 30 PSI with vacuum. I recall the specs being pretty wide, but the difference seems too much. Is this an issue? I installed a Borg Warner part instead of Motorcraft. I'm thinking this may be a mistake.
Any thoughts appreciated!
I have replaced the filter and pressure regulator. With the old regulator, I had 44 PSI without vacuum and 35 PSI with vacuum. With the new regulator, I have 39 PSI without vacuum and 30 PSI with vacuum. I recall the specs being pretty wide, but the difference seems too much. Is this an issue? I installed a Borg Warner part instead of Motorcraft. I'm thinking this may be a mistake.
Any thoughts appreciated!
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