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Old 04-17-2012, 06:46 AM
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Loooow Fuel Pressure!

So i just replaced the motor/pump on my Airdog2 about a week ago...got my fuel pressure gauge hooked up and i'm reading a very erratic 30-40 psi with engine off and at idle, about 20 cruising and almost nothing at WOT!!! Is there anything else that would cause such low pressures or did I get a bum replacement pump from Airdog??
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Old 04-17-2012, 07:07 AM
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Your gauge could be messed up as well. Just a thought


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Old 04-17-2012, 08:01 AM
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I dont think it is. I can hear the pump changing pitch with the pressure change and every so often it will jump around 50psi accompanied by a higher pitch sound from the pump. At WOT there is a definite power loss.
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Old 04-17-2012, 08:31 AM
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Well I wouldn't drive it like that.sounds like you got a bad pump


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Old 04-17-2012, 08:53 AM
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what else would cause low fuel pressure outside of the pump?
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Old 04-17-2012, 08:57 AM
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Thats what i want to be sure of. Only other thing I can think of is maybe its sucking air...but wouldnt that cause it to no-start?
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Old 04-17-2012, 09:17 AM
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If it's not a gauge issue it has to be the pump or its regulator. A leak in the system would be constant, not turn itself on an off.
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Old 04-19-2012, 08:05 AM
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Made some progress today. The pump is good...I hooked up some extra fuel hose I had to the pump intake and put it directly into a can of fuel...55-60psi. I need to check out the fitting that goes into the tank now to see if I can find the air leak
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