Join Date: Oct 2011
Location: Arvada, CO
Thanked 17 Times in 12 Posts
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Fuel Pressure Springs - Airdog 100/150
Do these springs typically not provide the pressure that is advertised, or am I doing something else wrong?
Knowing that most folks seem to want a WOT pressure reading of above 14psi on the 24v trucks, I was watching for this pressure level when I installed my new lift pump / pressure gauge.
With the factory installed spring (which is listed at 15 psi, +/- 2 psi) I found that I was getting between 12-13.5 psi, and probably only holding around 12 psi at highway speeds.
So, I switched to the other spring that was provided in the kit. My understanding was that this spring was supposed to be a "17 psi" spring. Allowing for the 2 psi +/- variation, this should theoretically keep my pressure above 15 psi. But, this spring is only giving me between 13.5-15 psi.
I have a couple of theories:
1) The second spring is a direct replacement for the first, and is NOT a heavier pressure spring.
2) The springs aren't very accurately "calibrated"
3) My fuel pressure gauge is reading low. I'm using an Isspro mechanical, with an isolator.
Since these setups are so common around here, I thought I'd ask to see what you guys have noticed with yours!
1999 Dodge Ram 2500, 5.9L 24v, Auto Trans, 4x4, SRW, LB, Quad Cab, 285 75R16 tires, 131K miles, Airdog 100 with drawstraw V, Isspro Mechanical 0-30psi FP gauge with isolator.