Duramax Diesels Forum Truck of the Week
  #1  
Old 12-05-2017, 08:40 PM
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Default Losing Prime

Ok friends, have a good one on my hands. A few months ago I noticed my factory header was starting to wick and get dust collecting on it(have a cat adapter btw) so I got an o-ring kit and rebuilt it. 3rd time I've rebuilt the pos too. While I had the head torn apart I just happened to hit the primer button over a shop towel, noticed a bunch of glitter on the towel. Looked closer and it was straight metal shavings. Brake cleaned entire head and resembled. Took a picture of the towel and showed it to rob(atp) a couple days later and he said he'd never seen that other than on the cp4's. Cut open cat and both airdog filters, found no metal at all. Then a week later I noticed fuel on my frame rail, inspect and found header leaking bad. Rolled the little o-ring on the heater element and cut it during install(dumb). Truck started losing prime at this point. Rebuilt header again and no leaks. While I was in there noticed the fuel hose from header to ficm starting to wick at my hose clamp, replaced both fuel hoses on header. Ever since then it fires instantly and dies about 5 seconds in after sitting for more than a couple hours. Removed intake horn and checked valley, no leaks or wicking. Cannot find a visible fuel leak anywhere. Had to let pump run for a solid 20 seconds before starting so it wouldn't die right after. Even after letting the pump run it would surge quite a bit and act like it was sucking air until I let it run for a few minutes. Then yesterday my airdog quit altogether. Checked for power at the pump connector and it's present. So pump crapped out amd waiting on a new one. If I hit the primer a few times it firms up then after engine start it doesn't die. Think this is all the airdog or do I have something else going on? Anyone else experience this?
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Old 12-05-2017, 09:11 PM
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Did you pull the air dog or bypass around it?
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Old 12-05-2017, 09:13 PM
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Did you pull the air dog or bypass around it?
Neither, just pulled fuse and pulling fuel thru it.

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Old 12-05-2017, 09:16 PM
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Sometimes they don’t like pulling fuel through. Try hooking your hoses together.
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Old 12-05-2017, 10:11 PM
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Sometimes they donít like pulling fuel through. Try hooking your hoses together.
Ya I experienced this last winter when bad fuel plugged the filter. Wouldn't run at all. I just haven't had time to bypass it yet. Just seeing if anyone else has experienced these symptoms before. Thanks Burn Down. I'll pm you with results if you're interested.

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  #6  
Old 12-06-2017, 06:03 AM
aashton1206 aashton1206 is offline
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Pumps donít usually die like this, it is either all or nothing. Sounds like to separate issues. However after fixing the ad the leak should be very easy to find.


2004 Silverado Cali lb7, Airdog ll 165, fresh sticks at 325k, Rick Fletes Dsp 5 on v2, 33x12.5 nitto at on 20 inch American Racing 20x10 wheels, Stage 5 Built Transmission by Mike Cole with triple disc billet low stall converter, 4 inch Injen cold air intake, Profab Intake Horn, Batmo Wheel, PPE Race Valve, Full EGR Removed w/ fed belt, 3.5 inch MBRP Downpipe, Full five inch MBRP Exhaust axle dump, lbz cp3 pump, Dual Platinum AGM Duralast, High Output Alternator, Cognito Pittman and idler w/ support kit, Cognito Upper Contol arms, Drilled and Slotted Rotors on all four Corners, FED Y Bridge, Shantz Custom Fab Traction Bars.
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Old 12-06-2017, 09:14 AM
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Quote:
Originally Posted by CHEZELTINE View Post
Ya I experienced this last winter when bad fuel plugged the filter. Wouldn't run at all. I just haven't had time to bypass it yet. Just seeing if anyone else has experienced these symptoms before. Thanks Burn Down. I'll pm you with results if you're interested.

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Sounds good
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Old 12-06-2017, 09:15 AM
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Quote:
Originally Posted by CHEZELTINE View Post
Ya I experienced this last winter when bad fuel plugged the filter. Wouldn't run at all. I just haven't had time to bypass it yet. Just seeing if anyone else has experienced these symptoms before. Thanks Burn Down. I'll pm you with results if you're interested.

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  #9  
Old 12-06-2017, 09:43 AM
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Quote:
Originally Posted by aashton1206 View Post
Pumps donít usually die like this, it is either all or nothing. Sounds like to separate issues. However after fixing the ad the leak should be very easy to find.


2004 Silverado Cali lb7, Airdog ll 165, fresh sticks at 325k, Rick Fletes Dsp 5 on v2, 33x12.5 nitto at on 20 inch American Racing 20x10 wheels, Stage 5 Built Transmission by Mike Cole with triple disc billet low stall converter, 4 inch Injen cold air intake, Profab Intake Horn, Batmo Wheel, PPE Race Valve, Full EGR Removed w/ fed belt, 3.5 inch MBRP Downpipe, Full five inch MBRP Exhaust axle dump, lbz cp3 pump, Dual Platinum AGM Duralast, High Output Alternator, Cognito Pittman and idler w/ support kit, Cognito Upper Contol arms, Drilled and Slotted Rotors on all four Corners, FED Y Bridge, Shantz Custom Fab Traction Bars.
I know it's weird. But yes I agree, have compounding issues going on. I'll get ad pump replaced then go from there. However, even when my pump was working fine I never did find any external leaks.

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Old 12-13-2017, 11:16 AM
aashton1206 aashton1206 is offline
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Then check your oil


2004 Silverado Cali lb7, Airdog ll 165, fresh sticks at 325k, Rick Fletes Dsp 5 on v2, 33x12.5 nitto at on 20 inch American Racing 20x10 wheels, Stage 5 Built Transmission by Mike Cole with triple disc billet low stall converter, 4 inch Injen cold air intake, Profab Intake Horn, Batmo Wheel, PPE Race Valve, Full EGR Removed w/ fed belt, 3.5 inch MBRP Downpipe, Full five inch MBRP Exhaust axle dump, lbz cp3 pump, Dual Platinum AGM Duralast, High Output Alternator, Cognito Pittman and idler w/ support kit, Cognito Upper Contol arms, Drilled and Slotted Rotors on all four Corners, FED Y Bridge, Shantz Custom Fab Traction Bars.
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  #11  
Old 12-13-2017, 11:25 AM
Nickracer9 Nickracer9 is offline
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How old is your airdog?
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  #12  
Old 12-13-2017, 12:35 PM
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How old is your airdog?
Just about 4 years. Going to get new pump tomorrow and hopefully get it on this weekend. I'll keep you guys updated.

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  #13  
Old 12-13-2017, 12:59 PM
Nickracer9 Nickracer9 is offline
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My air dog had some issues internally after 4-5 years. Kept losing prime and just shutting the truck off for about a month. I ended up putting a sump on and going with a fuel lab lift pump and that fixed all my issues. Even manged to get more rail pressure at WOT.
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Old 12-13-2017, 07:03 PM
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Quote:
Originally Posted by Nickracer9 View Post
My air dog had some issues internally after 4-5 years. Kept losing prime and just shutting the truck off for about a month. I ended up putting a sump on and going with a fuel lab lift pump and that fixed all my issues. Even manged to get more rail pressure at WOT.
Really. That's good info man. What sump did you go with?

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Old 12-13-2017, 07:45 PM
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Quote:
Originally Posted by aashton1206 View Post
Then check your oil


2004 Silverado Cali lb7, Airdog ll 165, fresh sticks at 325k, Rick Fletes Dsp 5 on v2, 33x12.5 nitto at on 20 inch American Racing 20x10 wheels, Stage 5 Built Transmission by Mike Cole with triple disc billet low stall converter, 4 inch Injen cold air intake, Profab Intake Horn, Batmo Wheel, PPE Race Valve, Full EGR Removed w/ fed belt, 3.5 inch MBRP Downpipe, Full five inch MBRP Exhaust axle dump, lbz cp3 pump, Dual Platinum AGM Duralast, High Output Alternator, Cognito Pittman and idler w/ support kit, Cognito Upper Contol arms, Drilled and Slotted Rotors on all four Corners, FED Y Bridge, Shantz Custom Fab Traction Bars.
Ya fires up hot or cold like I said then dies about 5 seconds into running. I do oil samples every change and 2k mi ago there was no fuel in oil. Its not injectors or cp3. Pretty sure its coming from the oem filter head.

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