What fuel pressure do you run if you have a gauge?

[CUMMINSDIESELPWR]

A poll to help with quick look at vitals.

[98whitelightnin]

I run 18 at idle and 16-17 at wot with fass 150.

[hex0rz]

I run around 19psi at idle and about 13 psi WOT. I have been recently thinking about my fuel delivery system. I have an Airdog 165, but the feed line goes to the OEM filter housing. Right before I bought the airdog I replaced the oem filter with a new one. And I wanted to take advantage of any pre-heat I could get being I live in the PNW. Whether or not it really helps, I dunno. But I think my flow is reduced because of the smaller steel line from the filter housing to the vp44. Although, I do like the extra filter for insurance before the vp44.

[dripley]

Mr. Cummins I answered both questions that time. I can read again.

[dripley]

I run around 19psi at idle and about 13 psi WOT. I have been recently thinking about my fuel delivery system. I have an Airdog 165, but the feed line goes to the OEM filter housing. Right before I bought the airdog I replaced the oem filter with a new one. And I wanted to take advantage of any pre-heat I could get being I live in the PNW. Whether or not it really helps, I dunno. But I think my flow is reduced because of the smaller steel line from the filter housing to the vp44. Although, I do like the extra filter for insurance before the vp44.

I am set up just like you except I installed a bigline kit http://www.vulcanperformance.com/Universal-Big-Line-Filter-to-Injection-Pump-Kit-w-p/ffip59.htm form the fuel canister to the vp. I added a push lock tapped tee for fuel prsssure access.I use the 90 with the tap to bleed the low pressure fuel system when neccesary. it Keeps my WOT at 16.5 psi.

[Mopar1973Man]

Since I only see a 2 PSI fall... I typically idle @ 19 PSI and WOT @ 17... This is with warm fuel. But with winter cold still here it more like 18 @ idle and 16 @ WOT.

[gassernomore]

Mr. Cummins I answered both questions that time. I can read again.

Yea, but 3 others only answered once!

[dripley]

Yea, but 3 others only answered once!

Must be the home of the blind. I know I'm a memeber.

[RJC2]

18 psi @idle14 psi @WOTAir Dog 100 with big line kitOriginal fuel filter still plumbed in

[MarbleCrusher]

15-16psi @idle and 13-14@WOT. Running a FASS 95 w/fuel filter and water seperator. Through the factory tank pick up and still running through the factory fuel filter as well although that may soon change to increase fuel pressure a little.-Jordan-

[thebullet83]

my fass ddrp that some tell you shy away from pushes about 15-20 idle and about 13-15 wot

[Mopar1973Man]

Verified mine today... With starting temps as low as +10*F this morning it was 17 @ idle and 15 @ WOT. But by the time the fuel warmed up in Ontario, OR today at nearly 60*F out its back to normal summer pressures of 19-19.5 @ idle and 17 @ WOT.Now the spring problem is gone for me... The trick is for all AirDog 100 and AirDog 150 pumps remove your spring and slightly crush the end coils so they are no longer absolutely circle but slightly oval. No more check ball jamming in the coils of the spring!

[JAG1]

Verified mine today... With starting temps as low as +10*F this morning it was 17 @ idle and 15 @ WOT. But by the time the fuel warmed up in Ontario, OR today at nearly 60*F out its back to normal summer pressures of 19-19.5 @ idle and 17 @ WOT. Now the spring problem is gone for me... The trick is for all AirDog 100 and AirDog 150 pumps remove your spring and slightly crush the end coils so they are no longer absolutely circle but slightly oval. No more check ball jamming in the coils of the spring!

Where is this check ball / spring thing-a-ma-bob? If ya' don't mind me askin'? I think I know, but, wanna' make sure.

[volkswagon]

Where is this check ball / spring thing-a-ma-bob? If ya' don't mind me askin'? I think I know, but, wanna' make sure.

It's in the pump behind the fitting that leads to the engine. I've got a problem with mine that the fuel pressure swings a good 4 psi. At idle it's not too bad but as soon as I put a little power down the gauge needle is swinging pretty good. I've ordered new springs but just wondering if anybody here has had this problem.

[Mopar1973Man]

Where is this check ball / spring thing-a-ma-bob? If ya' don't mind me askin'? I think I know, but, wanna' make sure.

Actually its the return line to the filler neck will have all this behind the fitting...

[volkswagon]

Actually its the return line to the filler neck will have all this behind the fitting...

Thanks for clarifying my mistake:doh:

[IW378]

Verified mine today... With starting temps as low as +10*F this morning it was 17 @ idle and 15 @ WOT. But by the time the fuel warmed up in Ontario, OR today at nearly 60*F out its back to normal summer pressures of 19-19.5 @ idle and 17 @ WOT. Now the spring problem is gone for me... The trick is for all AirDog 100 and AirDog 150 pumps remove your spring and slightly crush the end coils so they are no longer absolutely circle but slightly oval. No more check ball jamming in the coils of the spring!

You didn't by chance take a picture of your tweak spring did you? I'd like to do that but it's a pain to get to and only wanna do it once. My PSI is 16 at idle and 14 at WOT and I'm running a 17 pound spring on an ad 100. Luke

[bh115577]

I've still got a stock lift pump on the block. 12.5 psi at idle and 8psi at WOT. I do have an AD 100 and big line kit on the bench waiting to be installed. I will be fixing the spring issue before I put the pump in.

[gassernomore]

I've still got a stock lift pump on the block. 12.5 psi at idle and 8psi at WOT. I do have an AD 100 and big line kit on the bench waiting to be installed. I will be fixing the spring issue before I put the pump in.

Is your VP the original? With those type of pressures your on borrowed time. Just putting on your AD 100 is going to help but it is not going to repair any damage done with your low pressure that your showing.

[bh115577]

Is your VP the original? With those type of pressures your on borrowed time. Just putting on your AD 100 is going to help but it is not going to repair any damage done with your low pressure that your showing.

I replaced the lift pump only at 100k miles and then the VP and lift pump at about 200k miles. I never knew about these issues until a few years ago when I started reading up on things so I set aside some money for another VP and I figured I'd just run it until it quits. Still going for over 2 years now. Power is still good and mileage is 15-16/gal on winter fuel with the truck loaded with tools.