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Old 02-01-2012, 04:00 PM   #1 (permalink)
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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.

or

2) The springs aren't very accurately "calibrated"

or

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!
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Old 02-01-2012, 04:21 PM   #2 (permalink)
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I got 15 psi with my AD150 when I put mine in. I put the higher psi spring in and now I have 20psi at idle and 18-19 at cruising speeds. My buddy who has the AD100 gets 12-13 at idle with his too.
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Old 02-02-2012, 03:44 AM   #3 (permalink)
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So, I wonder what I can do at this point to increase my pressure?

I'd like to keep it over 14psi at a minimum, since that appears to be the pressure required to open the overflow valve on the VP44, and allow continuous fuel flow. But, neither of the springs that came with my Airdog are providing that kind of pressure. I watched it closely on my commute today (with the second spring installed). 14-14.5 psi was about the running level at idle. At highways speeds it dropped into the 13-13.5 psi range. In other words, I'm close to where I want to be, but not quite there. And, based on what the Airdog literature stated, I should be seeing the pressure I need at this point.
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Last edited by Coloradokevin; 02-02-2012 at 04:47 AM.
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Old 02-02-2012, 04:46 AM   #4 (permalink)
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I would call Airdog. I have read you can stretch the springs a little to increase the pressure but I am not sure how well that works. They might have other springs they could send you too.
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Old 02-02-2012, 04:51 AM   #5 (permalink)
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Quote:
Originally Posted by twheat View Post
I would call Airdog. I have read you can stretch the springs a little to increase the pressure but I am not sure how well that works. They might have other springs they could send you too.
Guess I'm not the only one who's up late (or, perhaps early, depending on your location)!

I may have to give Airdog a call about this in the morning. But, I've definitely come to the conclusion that there's really very few issues or problems that I've come across with my truck that haven't been seen around here first
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Old 02-02-2012, 10:02 AM   #6 (permalink)
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The springs you received in your kit should be the 15 & 17 psi springs. We have 10, 15, 17 and 30. Unless that spring was a little out of spec when it was made it should dead head at 15 psi. You can try pinching the fuel line after your fuel pressure sensor and see if the pressure goes up. With you trying both springs and the pressure being different on both it does sound like the springs are fine.

Just remember that every truck is different and what might read 15 on one truck could read 14 on another. One of that girls that works here has that same spring/kit on her truck and it holds 15-16 psi at idle and 14-15 under load.

If you don't see any difference then you can stretch the spring and that will help raise the pressure to where you woud like.
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Old 02-02-2012, 10:21 AM   #7 (permalink)
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I have experienced the same, I put in my 17psi spring and my gauge shows 15-16
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Old 02-02-2012, 02:38 PM   #8 (permalink)
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Well with what I'm running it can say 16 to 14 and cruising 14 wot it can drop to abt 12 to 10 depending on how much fuel u need I'm pushing a lot lol
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Old 02-02-2012, 03:05 PM   #9 (permalink)
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Quote:
Originally Posted by 1lowdiesel View Post
The springs you received in your kit should be the 15 & 17 psi springs. We have 10, 15, 17 and 30. Unless that spring was a little out of spec when it was made it should dead head at 15 psi. You can try pinching the fuel line after your fuel pressure sensor and see if the pressure goes up. With you trying both springs and the pressure being different on both it does sound like the springs are fine.

Just remember that every truck is different and what might read 15 on one truck could read 14 on another. One of that girls that works here has that same spring/kit on her truck and it holds 15-16 psi at idle and 14-15 under load.

If you don't see any difference then you can stretch the spring and that will help raise the pressure to where you woud like.

Will stretching the spring be able to make up a few psi difference? With the 17psi spring I'm only getting 13-13.5 psi while driving down the road at 60 mph, and no better than 14.5 psi at idle. I'd really like to keep 14 psi at the bare minimum.

I'm currently completely stock, and my experience thus far leaves me a bit concerned that this pump may not be able to keep up with any performance modifications that I might do in the future, considering that 17 psi spring isn't even getting me 14psi during a straight and level 60mph cruise right now (it was my understanding that the 100 gph pumps were supposed to be good to go for trucks up to 500 hp).
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Last edited by Coloradokevin; 02-12-2012 at 02:34 AM.
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Old 02-12-2012, 02:32 AM   #10 (permalink)
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Anyone else have advice on this issue? I'll try the fuel line pinch test that 1lowdiesel mentioned, and see if that changes things. Also, could the snubber fitting be causing a low reading at the gauge?

I'm still a bit surprised that my 17psi Airdog spring is only producing an average pressure of 13-13.5 psi at cruise speeds, given that my truck is otherwise stock (save for this fuel system).

I haven't tried stretching the spring yet. I have a couple of issues there (only one or two of which you guys may be able to help with):

1) I don't exactly know how that helps, or how much I'm supposed to stretch it.
2) There's a lot of snow on the ground right now, and I'd like it to melt before I play under the truck again (that's in nature's hands).
3) I can't confirm whether or not a spring stretch would actually make up the 4 psi difference between the spring's rating and the pressure I'm reading, or if I just need a heavier spring.
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Last edited by Coloradokevin; 02-12-2012 at 02:40 AM.
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Old 02-12-2012, 11:28 AM   #11 (permalink)
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before stretching any springs, I'd try a different gauge to confirm your gauge is accurate....and a pound or two either way is not gonna make any difference to your vp, My opinion is your trying to pick fly poop out of pepper

only my opinion
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Old 02-12-2012, 01:12 PM   #12 (permalink)
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Well I would first verify the install of your isolator. I would not be without one, I don't want fuel in the cab for several reasons. That said I did have some issues with my install the 1st time. I didn't get compression fitting at the gauge tighten enough to the back of the gauge the 1st time. This resulted in the antifreeze leaking out and the gauge going to zero.

So I 1st used a Q-Tip to make sure the isolator bladder was all the way to the fuel side of the isolator, then filled with anti-freeze, then loosely attached the tube from the gauge and filled it from the gauge end, allowing the air to bleed out at isolator. Tighten the fitting at the isolator, then fill the rest of the tube and attach to the Gauge.

Where are you reading the FP? If you are still using the stock fuel filter, did you install a 1/2" line from the filter to the VP$$?
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