Fuel pressure problem?
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Fuel pressure problem?
I have an airdog 2 165gph going to a regulated fuel return. When I start if lt goes to 45 then 55 then 60psi then just drops to 45 I tryed to find a leak no luck. When I turn down the pump it just can drop to zero
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Joined: Dec 2003
Posts: 15,369
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From: Stuttgart, Ar
Here's the way I set mine:
1) Turn the PUMP regulator all the way in and back it out about 3/4 turn. DO NOT tighten it down when turning it in. All it has to do is lightly touch the seat.
2) Adjust the fuel pressure regulator under the hood to 58 psi.
If you're having issues with the pressure not staying adjusted then using the AD2 instructions remove the fuel pressure regulator adjusting screw and the plunger/piston and check the small o-ring on the end. I'll bet it's split/broken. The pump comes with a spare one. Replace, install, and retest. You may have to adjust the fuel pressure screw a bit but remember that more pressure does NOT equal more fuel. It's more important to maintain the fuel pressure steady at 58 or 60 than have it at 70 and drop to 45 or 50 at WOT.
1) Turn the PUMP regulator all the way in and back it out about 3/4 turn. DO NOT tighten it down when turning it in. All it has to do is lightly touch the seat.
2) Adjust the fuel pressure regulator under the hood to 58 psi.
If you're having issues with the pressure not staying adjusted then using the AD2 instructions remove the fuel pressure regulator adjusting screw and the plunger/piston and check the small o-ring on the end. I'll bet it's split/broken. The pump comes with a spare one. Replace, install, and retest. You may have to adjust the fuel pressure screw a bit but remember that more pressure does NOT equal more fuel. It's more important to maintain the fuel pressure steady at 58 or 60 than have it at 70 and drop to 45 or 50 at WOT.
Hotshot
Joined: Dec 2003
Posts: 15,369
Likes: 121
From: Stuttgart, Ar
I just read a thread about this particular part failure on the AD2. If you can get a Viton O-ring sized a011 to replace it you'll be better off. Harbor freight carries a kit with several sizes for a very good price. ~$10
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