Where Do I Start?
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New User
Joined: Nov 2007
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From: Houston/Praha
Where Do I Start?
I have a 84 F250, 6.9 diesel, that hasn't run now for a couple of years. When it was last running it would start and run great, but after about 30 minutes it would die, and have to sit for 20 or 30 minutes before restarting. One thing I think happened before or maybe during this time frame is it ran out of diesel. I have previously installed new OEM glow plugs.
Im good with gas engines and a wrench, have rebuilt several. But the diesel is kind of foreign to me. Could somebody give me what they think is a good check list procedure to go with. It's my farm "beat it up" truck.
I also have access to a good well running 83 six banger from a Bronco i was thinking about using for a swap. Good idea or bad?
Im good with gas engines and a wrench, have rebuilt several. But the diesel is kind of foreign to me. Could somebody give me what they think is a good check list procedure to go with. It's my farm "beat it up" truck.
I also have access to a good well running 83 six banger from a Bronco i was thinking about using for a swap. Good idea or bad?
Senior User
Joined: Nov 2011
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keep the diesel!
checklist:
when cold/sitting overnight
1) does glow plug light stay on for 10-15 sec at startup?
2) remove fuel filter, is it full or under full?
3) do you have at least 1/2 tank or more fuel in tank?
If #1 is less than 8-10sec you probably have a bad gp or more
If #2 is half-full or less you probably have an air-intrusion somewhere
If tank is under 1/2 full it may not start due to a broken pick-up tube, common in these trucks.
sounds like air-intrusion...
what type of glow-plugs did you install?
checklist:
when cold/sitting overnight
1) does glow plug light stay on for 10-15 sec at startup?
2) remove fuel filter, is it full or under full?
3) do you have at least 1/2 tank or more fuel in tank?
If #1 is less than 8-10sec you probably have a bad gp or more
If #2 is half-full or less you probably have an air-intrusion somewhere
If tank is under 1/2 full it may not start due to a broken pick-up tube, common in these trucks.
sounds like air-intrusion...
what type of glow-plugs did you install?
Senior User
Joined: Apr 2012
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Air intrusion is usually the problem. make sure your GP's are working. If they are, start looking for air leaKs in the return lines. Also look under the injection pump for fuel leaking, sometimes the pump will leak and not stay primed with fuel.
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New User
Joined: Nov 2007
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From: Houston/Praha
Its been a couple of years on the GP's, but I remember researching for the correct ones and not the generic off the shelf. I know they were hard to find and I got the last 6 in Houston at the time.
Logistics Pro
Joined: Sep 2007
Posts: 3,737
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From: Western Mass
Sounds a little like a clogged filter or fuel pickup tube to me. It will run until the tube/filter gets clogged full of debris, then the engine stalls out. Resting a bit, the pressure (vacuum) in the fuel subsides and the clog falls free. After running again it will get sucked up and clog again.. repeat....
Possibly sometime floating around in the tank?
Possibly sometime floating around in the tank?
Junior User
Joined: Jan 2011
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From: MO
Fuel delivery is your most likely suspect. I would lean toward the IP.
A diesel isn't any harder to work on than a gasser, some would say they're easier.
you could possibly drop a grand in getting a diesel up and running or few hundred dollars to drop in a six banger that will turn the wheels but probably not much more than that.
your call
good luck
A diesel isn't any harder to work on than a gasser, some would say they're easier.
you could possibly drop a grand in getting a diesel up and running or few hundred dollars to drop in a six banger that will turn the wheels but probably not much more than that.
your call
good luck
Logistics Pro
Joined: Sep 2010
Posts: 4,411
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From: Victor, MT
Keep the diesel it will get better fuel mileage than that six banger, plus you will have to get a different C6 transmission or the T-18 4 spd instead of T-19....whichever you have.
Sounds like fuel delivery, I know lift pumps can cause that kind of problem too, how bout your Fuel Tank Selector valve(FSV for short) what kind of condition is it in?
Sounds like fuel delivery, I know lift pumps can cause that kind of problem too, how bout your Fuel Tank Selector valve(FSV for short) what kind of condition is it in?
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