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Discussion Starter · #1 ·
I have had my 06 3500 Duramax now for about a month and sometimes when i shut my truck off and get out i hear what sounds a pump running sometimes for 10 seconds or more.Where is this comming from and why does it keep running when engine is shut off.It was bought new as a cab and chassis and it now has a flatbed installed on it.Do all Duramax's have 2 fuel tanks and 2 different places to put fuel in
 

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Most Dmax's do not have 2 tanks and 2 spots to put fuel in. Is the sound your hearing a air compressor? If it has airbags in the rear it could be a compressor
 

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Probly hearing the transfer pump pumping from one tank to the other
 

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i hear it on mine, like a pump, click, pump click. Gotta get down close to the hood or have it open to hear it. Maybe it's fuel being pumped in for the next start up. Who knows?
 

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Discussion Starter · #5 ·
I only hear it when truck is shut off.This sound is very loud you can hear it 30' away from truck.It is coming from the fuel tank area.So the fuel has to be pumped from the extra tank into the main one?I thought it would be equalizied by gravity at the bottom of the 2 tanks somehow.
 
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