What do I do?
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Elder User
Joined: Aug 2007
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From: South-Central Kentucky
What do I do?
Heeelllp!!!!! Got everything back together on the truck today and started it up. No problem at first. It was running just a little bit rough but not bad at all. I had filled the HPOP with oil drained the water out of the fuel bowl the tank was about 3/4 full. The truck ran until the fuel bowl ran dry and obviously it died. I checked the fuel bowl with the key on and it is not getting any fuel coming in. I checked all the fuses and they are good. I unplugged the fuel bowl heater, and checked the connections to the fuel pump. What else am I missing? Which relay is it that controls the fuel pump and which one can I pull and replace it with to test it? When I turn the key on I cannot hear the fuel pump running that is why I believe the relay is possibly bad. Is there a fusible link to the fuel pump, if so where? Thanks, Mike.
Logistics Pro
Joined: Jun 2005
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From: AZ
Mike...sorry to hear of the problem. How about just a long wire with alligator clips on each end. Put one to the battery + post and the other end to the fuel pump. If it works you know the problem is in the wiring or fuse. I'd then do a fuel pump volume test if it worked.
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Elder User
Joined: Aug 2007
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From: South-Central Kentucky
Good idea, for some reason that never crossed my mind and it is very likely that it is tripped since the truck was flipped and this is the first time it has been started since.
Gone, but not forgotten
Joined: Oct 2005
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From: Charlotte-Fairbanks-Bflo
Mike...sorry to hear of the problem. How about just a long wire with alligator clips on each end. Put one to the battery + post and the other end to the fuel pump. If it works you know the problem is in the wiring or fuse. I'd then do a fuel pump volume test if it worked.
Gone, but not forgotten
Joined: Oct 2005
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From: Charlotte-Fairbanks-Bflo
You're more than welcome, reps to ya for giving me a question I could answer.
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Elder User
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From: South-Central Kentucky
Now here is something that has me scratching my head. After I reset the fuel pump shutoff switch, I made sure that there was plenty of fuel in the fuel bowl and started the truck up, all of a sudden the engine started revving really high without my foot on the throttle at all, and when I say high I thought the engine was going to blow up. I shut off the key and it had no effect, I jumped out of the truck and got back because I thought that the motor was getting ready to resemble that motor of Cale's that wound up in three pieces, after about thirty seconds and a huuuge cloud of bluish-white smoke the truck shut off. I got back in and it started right up and ran fine with no problem. My theory is that the engine somehow had some excess fuel in there somewhere and it ran WOT until it burned it up and that's why it did nothing when I turned the key off. What are your thoughts? That really has me puzzled.
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Joined: Jul 2004
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From: Buckingham, IA
I'm kind of thinking out loud here. That fuel would have had to have been in the intake area because the injectors are controlled by electric current controlled by the key. If the engine was inhaling fuel from the intake, it could run with the key off. At least it quit before anything bad happened. Kind of scary I'm sure.
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Elder User
Joined: Aug 2007
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From: South-Central Kentucky
I hadn't followed the line of reasoning out that far, but I'm sure that it had to have been something like that. As of right now I have the bed off and the truck running so far no more problems other than I keep getting a big puff of bluish-white smoke on start-up. IIRC, that would be unburnt fuel. Ideas, anyone? Oh, before I forget, thanks to all that have replied.
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Elder User
Joined: Aug 2007
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From: South-Central Kentucky
That is possible in regards to the oil. I'll have to check that out. I was planning on cleaning out the IC tubes anyway. The smoke was a lot darker than most of the other smoke that I had seen and that could be where I am getting that puff of smoke on startup from too.
Fleet Owner
Joined: Jun 2004
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From: Rio Rico, AZ.
That was what is known as " diesel runaway". Fun isn't it? 
I got your PM, but it sounds like you have figured it out already.
I've been busy all day doing some repairs on the trailer before I set out on vacation with the kids.
I got your PM, but it sounds like you have figured it out already.
I've been busy all day doing some repairs on the trailer before I set out on vacation with the kids.
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Elder User
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From: South-Central Kentucky
Dan, it sounds like you have experienced this before. What causes this, and will it happen again? Have fun with the grandkids, some of my best memories are with my grandad. I sure miss him, it's been just over seven years since he went to heaven and I still miss him.
Of the next Riffraff East
Joined: Oct 2004
Posts: 8,679
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From: Concord NC
I don't know what caused it, but several years ago we had an 800hp Cat generator take off like that and could not shut her down, had that part of the hospital half cleared before she stopped and shutdown. We no longer have generators in the basements and have promises that the newer ones will never do that. Oh yeah, the amp gauges on the panels were pegs as well as the tach on the engine.