Airdog 165 fuel pressure reading? - Chevy and GMC Duramax Diesel Forum
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post #1 of 9 (permalink) Old 01-17-2020, 10:01 PM Thread Starter
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Airdog 165 fuel pressure reading?

Installed a fuel pressure gauge inline with the main 1/2 fuel line off of the airdog & Im getting 14 at idle & 13 if I’m on it. Is this a normal reading off of the main 1/2 fuel line? Fuel rail pressure is obviously different. Thanks
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post #2 of 9 (permalink) Old 01-18-2020, 06:04 AM
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That reading is pretty normal, the 165 should have an pressure adjustment screw. The older trucks didn't like anything over 8psi, my 165 sits at 11psi (with the screw turned all the way down to it's lowest pressure)idling but it doesn't seem to bother the 2001 truck I have.

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post #3 of 9 (permalink) Old 01-18-2020, 10:19 AM
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Honestly while your truck will run fine with that pressure it is too high for the rail pump (CP3). About the most pressure you want to run to the pump is 10 psi. Down to 8 psi is even better. Dean
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post #4 of 9 (permalink) Old 01-18-2020, 12:49 PM
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I'm pretty sure your liftpump has a removal 1/8" pipe thread fitting for a psi gauge, I might have miss-understood where you mounted the gauge.
Pictured below is a AD low pressure sensor fitting on the LP, then inline a psi sensor for a fuel psi gauge.
14 PSI is too high for the Duramax, get on AirDogs website and you'll see the recommended safe PSI is 8-10.
Its normal for the PSI to drop a little under acceleration.
Read your manual to see if you have a PSI adjustment or call AirDog 1-877-421-3187.

I started off with a FP100 AD motor went bad they replaced the motor with a 4G165, the PSI was 12-13 I had that dreaded 1/4-1/3 tank issues (plenty of talk about this, search) since I had just got a new replacement I had to pay out of pocket for a 4G100, it was worth it compared to having these issues.(motors are interchangeable)
Unless your engine is putting out 600+ HP a 4G100 would have been just fine, but you've already bit the bullet buying the 165.
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post #5 of 9 (permalink) Old 01-21-2020, 01:06 PM Thread Starter
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Quote:
Originally Posted by mray View Post
That reading is pretty normal, the 165 should have an pressure adjustment screw. The older trucks didn't like anything over 8psi, my 165 sits at 11psi (with the screw turned all the way down to it's lowest pressure)idling but it doesn't seem to bother the 2001 truck I have.
The 165 is adjustable & they have told me the preset them to 8-10 but mine reads 14. The truck runs great just wanted an idea on ideal pressure. It’s an 03 LB7 with about 530-550HP
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post #6 of 9 (permalink) Old 01-21-2020, 01:07 PM Thread Starter
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Quote:
Originally Posted by Dean E View Post
Honestly while your truck will run fine with that pressure it is too high for the rail pump (CP3). About the most pressure you want to run to the pump is 10 psi. Down to 8 psi is even better. Dean
Thanks Dean. I’ll try to drop down the pressure a tad even though the truck runs great. Don’t wanna burn up my pump.
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post #7 of 9 (permalink) Old 01-21-2020, 01:09 PM Thread Starter
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Quote:
Originally Posted by D_R_C View Post
I'm pretty sure your liftpump has a removal 1/8" pipe thread fitting for a psi gauge, I might have miss-understood where you mounted the gauge.
Pictured below is a AD low pressure sensor fitting on the LP, then inline a psi sensor for a fuel psi gauge.
14 PSI is too high for the Duramax, get on AirDogs website and you'll see the recommended safe PSI is 8-10.
Its normal for the PSI to drop a little under acceleration.
Read your manual to see if you have a PSI adjustment or call AirDog 1-877-421-3187.

I started off with a FP100 AD motor went bad they replaced the motor with a 4G165, the PSI was 12-13 I had that dreaded 1/4-1/3 tank issues (plenty of talk about this, search) since I had just got a new replacement I had to pay out of pocket for a 4G100, it was worth it compared to having these issues.(motors are interchangeable)
Unless your engine is putting out 600+ HP a 4G100 would have been just fine, but you've already bit the bullet buying the 165.
DRC,

Thanks for the pic. I have my PSI gauge inline with the main 1/2 line to the motor. I was going to tap it into the NPT service port but the fitting was too large as it was right next to one of the lines so I just spliced in a 1/2 Tee with a NPT port & ran the harness up into the a pillar where all my gauges are. Thanks
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post #8 of 9 (permalink) Old 01-21-2020, 01:12 PM Thread Starter
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I guess my main concern was pressure & how much it should be fluctuating. The lowest I’ve ever seen is 13 & highest is 15
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post #9 of 9 (permalink) Old 01-22-2020, 09:18 AM
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Idling the psi will be a little higher compared to accelerating.
When your accelerating the drop is because your engines taking on more fuel, max is max while idling.
As Iíve already mentioned 8-10 is considered safe these numbers are on the LP website.

If your at 15 high and 13 accelerating you could eventually do some damage to your fuel system.
My suggestion is to contact your LP company to get advice and see if thereís a way to lower the psi.

Me; I wouldnít risk possible damage to the fuel system with that high of psi, if they tell you that itís ok, then thatís between you and them.
Iíve already mentioned what I did when my psi was 12-13 with a 165.
You asked for opinions, this is what my opinion is.

Dan
2007.5 GMC Sierra 3500 SRW L.B."BLACK" C.C. 4X4 LMM Z71
DIY stock airbox mod, aFe ProGuard 7, OEM drop-in
EFILive ECM ATP - Heavy Tow Tune with Turbo Brake.
EFILive TCM Duramax Tuner
DHD Cold Side High Flow Intake Pipe, DHD PCV Re-Route, AirDog 4G100
Castrol Hypuron/Vecton 15W40 synthetic blend oil
Donaldson P550832 2 qt oil filter

2007 Yukon Denail "BLACK" 6.2 gasser
DIY stock AirBox Mod, K&N, Airaid intake, EFILive TCM only tuning
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