youngster needs help
Lead Driver
Joined: Nov 2003
Posts: 6,900
Likes: 3
From: Campbell River, B.C.
One other thing to look for (with all injector connections tight) is if there is any faint white mist coming out of the tailpipe. This would indicate that the injectors are firing, but the fuel is not igniting.
Lead Driver
Joined: Nov 2003
Posts: 6,900
Likes: 3
From: Campbell River, B.C.
Could mean low compression possibly combined with glow plugs not working properly. The white mist I described would be actual fuel going through the engine unburned.
Compression would have to be pretty low for a hot diesel engine to fail to restart though. I only need glowplugs for the first cold start in the day. Even after sitting for several hours I leave the glow plugs off.
I still have a feeling that your problem is in the injector pump.
Compression would have to be pretty low for a hot diesel engine to fail to restart though. I only need glowplugs for the first cold start in the day. Even after sitting for several hours I leave the glow plugs off.
I still have a feeling that your problem is in the injector pump.
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Senior User
Joined: Jul 2007
Posts: 287
Likes: 0
From: Ohio
i do think there is a white mist but with low compression i dont think it would start when cold either. i know i shouldnt of done it but i used ether once and it started and one other time it didnt.yesterday i used wd-40 with a sniff of either and it fired right up.
Posting Guru
Joined: Mar 2005
Posts: 1,701
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From: KY
I would hope I am wrong because of the cost but from here behind this keyboard it sounds allot like a transfer pump.
Does your motor still have the bleed line from the filter base to the fuel return line on the nozzles?
Another thing is that if you have a return line restricted that could cause a pressure in the return system which can cause a hard start or no start when hot when hot.
The thing is that it sounds like you aren't getting enough head pressure in the pump. When you give it some joy juice it bumps the rpm up enough that the pressure comes up and it starts.
Does your motor still have the bleed line from the filter base to the fuel return line on the nozzles?
Another thing is that if you have a return line restricted that could cause a pressure in the return system which can cause a hard start or no start when hot when hot.
The thing is that it sounds like you aren't getting enough head pressure in the pump. When you give it some joy juice it bumps the rpm up enough that the pressure comes up and it starts.
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Senior User
Joined: Jul 2007
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From: Ohio
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Brett Foote
Lead Driver
Joined: Nov 2003
Posts: 6,900
Likes: 3
From: Campbell River, B.C.
The transfer pump is located at the front passenger side side of the engine block. Roughly behind the vacuum pump. If you follow the hard fuel line that goes down the the passenger side of the engine you will find the fuel pump. Might be easier to see viewing from under the truck.
Elder User
Joined: Dec 2007
Posts: 854
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From: woodville, tx
may not be of any help, but mine does that from time to time - 87 6.9 i take an air compressor from the wifes ride and use a float attachment thingy and blow the fuel line out back to the tank.
Posting Guru
Joined: Mar 2005
Posts: 1,701
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From: KY
I am not talking about the lift pump on the block. The transfer pump is inside of the injection pump. Several pump have them but not all do. These injection pumps have them.
Hey David. If you have a pump of of an engine look inside the where the feed line goes into the back of the pump. You will see a place where a flat tip screw driver goes or maybe a Allen wrench, 3/16 maybe. That is where you make your adjustments . Clockwise turns up the pressure. I mentioned the specs as best I can remember earlier.
Hey, guys search "DB2 transfer pump" You will see what I am talking about.
These pumps are pretty strong. I have seen 6.5's run even with the electric fuel pump on the frame rail not working. If your fuel system is tight that pump is strong enough to run the engine without the lift pump. It will have low power but I have seen it happen that way. I can't say I have ever seen one of these motors run on the injection pump only but I have seen a few 6.5's that did. The complaint was a hard start with white smoke when it did start and low power.
http://www.agpub.on.ca/text/oct97/fp.htm. This guy talks about hooking up a gauge in his dash that reads the head pressure.
Hey David. If you have a pump of of an engine look inside the where the feed line goes into the back of the pump. You will see a place where a flat tip screw driver goes or maybe a Allen wrench, 3/16 maybe. That is where you make your adjustments . Clockwise turns up the pressure. I mentioned the specs as best I can remember earlier.
Hey, guys search "DB2 transfer pump" You will see what I am talking about.
These pumps are pretty strong. I have seen 6.5's run even with the electric fuel pump on the frame rail not working. If your fuel system is tight that pump is strong enough to run the engine without the lift pump. It will have low power but I have seen it happen that way. I can't say I have ever seen one of these motors run on the injection pump only but I have seen a few 6.5's that did. The complaint was a hard start with white smoke when it did start and low power.
http://www.agpub.on.ca/text/oct97/fp.htm. This guy talks about hooking up a gauge in his dash that reads the head pressure.