Deleted factory fuel filter today and won't run - Chevy and GMC Duramax Diesel Forum
04.5-05 LLY Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect

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Old 11-19-2012, 04:52 PM   eBay Motors  #1 (permalink)
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Deleted factory fuel filter today and won't run

I changed oil engine today and decided to delete factory filter. Unplugged the two harnesses and pulled the hose off the FICM, grabbed a piece of 1/2" fuel hose and coupled both ends from where the filter was.

Started right up and died. I figured had a bit of air. Let the Air Dog run for a minute or two, started right up then will run for a while misses every few seconds and after a minute or so it will die. Did this multiple times.

I opened up the fuel test port used a pick while lift pump was on and pressed on the schrader valve and got a bubble of air out. Still runs for minute then dies, can't get any more air out of the test port good clean fuel and plenty of it.

What should I try next???????
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Old 11-19-2012, 05:06 PM   eBay Motors  #2 (permalink)
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thats wierd man u shouldnt have to worry about air anymore with the ad. hope you get er up and going man.
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Old 11-19-2012, 05:08 PM   eBay Motors  #3 (permalink)
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Is your air dog functioning properly
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Old 11-19-2012, 05:11 PM   eBay Motors  #4 (permalink)
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did you prime the air dog?
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Old 11-19-2012, 05:41 PM   eBay Motors  #5 (permalink)
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did you prime the air dog?
You don't have to prime an AD. I would hook up to that schrader valve and make sure all the air is out.


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Old 11-19-2012, 05:44 PM   eBay Motors  #6 (permalink)
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oh my bad. I have been reading about so many different LP's. Sorry about that
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Old 11-19-2012, 06:16 PM   eBay Motors  #7 (permalink)
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oh my bad. I have been reading about so many different LP's. Sorry about that
Not a problem! The AD is supposed to filter out the air automatically and send it back to tank, providing the CP3 with fuel only. Notice I said supposed to!


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2007 LBZ CCSB Wehrli S475/stock-Suncoast by Dmitri
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Old 11-19-2012, 06:20 PM   eBay Motors  #8 (permalink)
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I mean do you not need to prime the AD with fuel on initial install??
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Old 11-19-2012, 06:27 PM   eBay Motors  #9 (permalink)
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I'm sure there was some air after having both ends open. The Air Dog seems to be working fine and has been on for one year with no other problems until now. I haven't checked with a gauge but at the test port you can push the valve in a full flow of fuel will push out 6"ish inches with no air bubbles.
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1994 dodge ram 2500 CTD 100 fuel plate and 3K GSK 4x4 SC flatbed.
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Old 11-19-2012, 06:29 PM   eBay Motors  #10 (permalink)
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I mean do you not need to prime the AD with fuel on initial install??
Nope, I never did. I put mine on, keyed on for maybe 30 seconds and it fired right up. This is with both AD filters dry (new) and a Cat filter on stock filter head dry (new). I wanted to test out the air filtering that AD claims and it for sure did.


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2007 LBZ CCSB Wehrli S475/stock-Suncoast by Dmitri
EFI Live: 620HP 1220TQ
5" DE, rerouted, debadged, demolded, air dog, stock fuel

Big thanks, Duramaxtuner.com & Kory Willis @ PPEI
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