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Old 01-21-2010, 10:13 AM   #1
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Fuel pump

I have a 91' CC with a 6V92TA Detroit and I cannot get the engine to start. It will crank over and if I use the manual primer pump I can get it started and keep it running as long as I keep priming it. Does this sound like the injector fuel pump is bad, or is there another fuel pump and if so where would the second one be located?

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Old 01-22-2010, 07:26 PM   #2
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Quote:
Originally Posted by mturner View Post
if I use the manual primer pump I can get it started and keep it running as long as I keep priming it. Does this sound like the injector fuel pump is bad,

Thanks
No, not really. It sounds like you've got air being introduced into the fuel system. If it were the high pressure pump, the injectors would not be able to operate the engine with insufficient pressure. I suspect that when you're operating the priming pump, your putting positive fuel pressure into the line, albeit very low, so that air can not be introduced downstream into the line.

Before replacing the high press. pump, I'd suggest starting at the priming pump and checking all fuel line connections to the high pressure pump for security. Having said that, I have to tell you I'm no RV diesel professional but know from working on sailboat diesels, that all diesels hate AIR! The principles are the same.

In addition to loose fuel line fittings, I'd also suggest looking for any fuel line chaffing that may have caused a small pin hole, allowing air to be introduced as well... Be very interested in what you find. Good luck! Bob
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Old 01-22-2010, 08:00 PM   #3
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I agree with scenic route. If it were the injector pump, the engine wouldn't run, period. The fact that it runs if you prime it suggests that you aren't getting fuel from the tank into the fuel line to the injector pump, which is the job of the lift pump in most diesels. I'm not familiar with the Detroit 6V92, so won't try to suggest where to look.
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Old 01-23-2010, 02:42 PM   #4
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Thanks, I will start looking at the hoses and connections.
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Old 01-26-2010, 01:26 PM   #5
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I finally called a two stroke technician out to look at the CC and he found a loose connection in the wiring harness that would contribute to part or most of the problem. After a couple quick butt splices he had the RV up and running. About 5 minutes later the RV choked again. There is a timing sensor that could be the rest of the promblems I am having. We are replacing the sensor and wiring harness, I will let you know if this fixes all my issues.

FYI, there only is one mechanical fuel pump for this year and model and it appears to be working fine.
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Old 01-27-2010, 01:06 PM   #6
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Glad to hear you are making progress on the repair.
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