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Ford Tractors Discussion Forum
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GM DIESEL

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bm3501466

04-02-2006 17:43:35




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I have been having starting problems with my truck that has the 6.5 diesel. When I start the truck it often dies. When it does start successfully it will run with no problems. The truck will start perfectly between 3 or more hours after it has been running at operating temperature and then being shut off. Any time though between an hour to three hours after the truck has been off after running, it will either not start or it will die within a couple of seconds after being started. I have put a new lift pump in it, however it is still being contrary. What could be the problem with my truck?
I know this isn't a GM forum, but I know you guys know your stuff fairly well.

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mowr

04-04-2006 13:38:30




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 Re: GM DIESEL in reply to bm3501466, 04-02-2006 17:43:35  
Using a fuel with less viscosity than diesel no. 2 (no. 1 or Kl for example) can cause this hot-start problem also.



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mowr

04-04-2006 13:36:41




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 Re: GM DIESEL in reply to bm3501466, 04-02-2006 17:43:35  
Using a fuel with less viscosity than diesel no. 2 (no. 1 or Kl for example) can cause this hot-start problem also.



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WayneB

04-03-2006 14:41:13




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 Re: GM DIESEL in reply to bm3501466, 04-02-2006 17:43:35  
Try this.
Take cool water and pour on the pump (slowly) and if it starts fairly soon, your problem is the pump.
When these Standadyne Roosamaster injector pumps get wear the internal tolorances are out of wear tolorance when hot, but are tricked back into tolorance when cool.

NEXT. Check the electric lift pump. You should feel it vibrating or hear it when oil pressure is made, which is after a few cranks. Check the fuse on the firewall. Apply a few PSI (@ 10 ) of air to the fuel tank and crank it over. If it fires right up, the low pressure lift pump is possibly bad. Low pressure comes from the electric pump and the internal cam pump inside the injector pump, which is what cooling tricks when worn.

Good luck
Wayne

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RodInNS

04-02-2006 19:15:41




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 Re: GM DIESEL in reply to bm3501466, 04-02-2006 17:43:35  
I'm not up on those engine's quirks at all, but if I had to guess, I would suggest checking the fuel shutoff solenoid. It's possible that heat might be affecting a weak solenoid, or there might even be bad wires around it's power supply. You could also go up the the tractor talk forum and post the question there. There's some guys there that worked on those engies quite a bit, and might know the source of your problem right off.....

Rod

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