Duramax Diesels Forum Truck of the Week
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Old 11-27-2011, 04:32 PM
bwoods001 bwoods001 is offline
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Question Air Leak????

I got a surge at idle i think a may have an air leak due to the fact that i can press the primer on top of the filter assembly with ease after running the truck for 10 to 15 min then letting it idle Is this normal????? THANKS
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Old 11-27-2011, 04:34 PM
bwoods001 bwoods001 is offline
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Default Air Leak

I have already replaced the primer screw and the whole (water check?) fitting on the bottom of the filter
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Old 11-27-2011, 04:40 PM
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If you don't have a lift pump, you should be able to easily push the primer pump on top of the filter head. It is under vacuum. Surge at idle is usually a FPR going bad or sticking. Try running some fuel additive or 2 stroke oil and see if it gets better.
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Old 11-27-2011, 05:37 PM
bwoods001 bwoods001 is offline
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Thanks i just wasn't sure. I am not throwing any codes is that normal???
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Old 11-27-2011, 05:40 PM
bwoods001 bwoods001 is offline
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the truck is a 2005 3500 4x4 if that makes any difference
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Old 11-27-2011, 05:48 PM
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The FPR normally will not throw a code until it is really bad. Does your truck try to push through the brakes at a stop light?
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Old 11-27-2011, 05:54 PM
bwoods001 bwoods001 is offline
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no not really just a slight surge no pushing though. It does it the worst in park idling
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Old 11-27-2011, 06:02 PM
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Need to hook up to a scanner to see what the FRP is doing or like stated above, try some good oil in the fuel to see if it helps.
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