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Duramax First Generation: 2001-2004 (LB7) Discuss the first generation (2001-2004 LB7) of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.

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Old 09-08-2005, 05:33 PM   #1 (permalink)
Josh9
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losing fuel pressure!!!!!

If I let my 2500HD 6.6 Duramax sit over night, I have to prime the engine again. Why is this happening. Brand new owner, other than this I have never owned such a nice truck.
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Old 09-08-2005, 05:42 PM   #2 (permalink)
Timberwolf530
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You have an air leak somewhere. Check all your fuel fittings, the bleeder screw, and your fuel filter. I just installed a primary filter and had the same problem. In my case, I just didn't get the filter tight enough.
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Old 09-08-2005, 06:13 PM   #3 (permalink)
Josh9
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Would this affect trucks performance at all?
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Old 09-08-2005, 06:18 PM   #4 (permalink)
briano
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Quote:
Originally Posted by Josh9 View Post
Would this affect trucks performance at all?
yes it would... instead of getting full pressure to your fuel system it leaks out and you may also get air in your system at some point as well. try all the things he mentioned above first..hopefully its something very simple.
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Old 09-08-2005, 06:24 PM   #5 (permalink)
Josh9
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I just bought the truck yesterday it has 105k on it. It runs perfectly just as much power as it should. When I parked last night it had very low fuel level, could this possibly be the cause. Once I primed it it started right up and drove fine. I parked it and let it sit for about three hours and then it started up again no problem. Any thoughts?
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Old 09-08-2005, 06:30 PM   #6 (permalink)
briano
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from your first thread I was under the impression that this has happened many times.. so you just bought it yesterday and its low on fuel and left overnight.

still check the filter and replace if it hasn't been..check the valve.. add fuel.. LOL You should never let a diesel run out of fuel, just a rule of thumb. the fuel system is under incredible pressures.

as mentioned, hopefully its just a loose screw or filter. also if you have never changed the filter go to the Do it yourself section and there are some nice write-ups about how to do it.
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Old 09-08-2005, 06:39 PM   #7 (permalink)
Josh9
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Thanks for the help. I live in New Jersey and I couldn't get an answer like that from any mechanic all day. I guess its best to talk with the die hard owners and fans. Being a new owner is there anything besides this problem that I should look into doing before I put it to work.
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Old 09-08-2005, 06:41 PM   #8 (permalink)
Josh9
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One last thing, when I went to prime it, the primer button had barely any resistance. Is this because no fuel or a leak. Or possibly a mixture of both.
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Old 09-08-2005, 07:00 PM   #9 (permalink)
briano
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if you had no resistance then you do have a pressure leak.. the rule of thumb when changing the filter is to prime that until its very very hard to push down verifying you have solid pressure.
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Old 09-08-2005, 07:54 PM   #10 (permalink)
Josh9
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If its a pressure leak, is this something to worry about right away or can it wait?
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