I have a 2001 dodge cummins it is having trouble starting when it is turned off an left off for a hour but when it cranks up u can turn it off an it will fire right back up as long as it is not longer than 30 mins or so it has a new lift pump on it does any one have a clew wht could be wrong with it

 

Sounds like its loosing prime.do you have a fuel preasure gauge to see what its running? If not get one to help you diagnose. Any codes? Sounds like air is getting into system somehow.

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No I don't have a gauge but when it is running it runs fine with no hesatation if it was loosing prime wouldn't that effect the way it runs? I don't know this is my first diesel truck ever.

 

If you put the throttle to the floor does it studder or hesitste?!

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And not nesacarily when the trucks running its pulling full from the tank with the pump on.when the truck sits pump isn't running which could cause it to loss pressure. When you changed the LP did u re prime system?

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Did the issue start shortly after the LP replacement, or later on?

 

No it does fine when u push it to the mat it doesnt miss or nothing only time I have problem with it is when it is shut down for mod than a hr

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An the problem started b4 that is why I put the new lift pump on it

 

There is a banjo bolt on the back of the head. It is common to come loose and make for hard starts. Fuel won't come out, but air will leak in. 17mm, and tricky to get to.

 

Do u think it needs new bango bolt an washers or just tightend?

 

99% of the time a tightening gets the job done. Otherwise new washers takes care of it, if it is leaking.