[yinzer5.9]

installed oil pressure gauge on fuel filter housing today, i will get a picture sometime, its a half sweep 0-40psi that came in a box of junk from an auction, a few brake line adapters and some kindof brake hose and it works great, I had less than 10 bucks in it and it reads 10 lbs at idle and a little over on throttle with a brand new carter lift pump, when i get my ecm back and get my hypertech tune on it im curious to see what pressure the carter will hold on a performance setting until i have the $ for an airdog

this is my first 24valve so im hoping i never have to replace the vp44 :thumbsup:

edited: move picture~ also i said the pressure reading backwards above, its about 12 psi at idle, and i had my girlfriend stomp the pedal and it reads a hair over ten this is with a new stock lift pump from advanced auto

 

[me78569]

dont do airdog. fass, and put it on before a tune. thw vp44 needs 14-20 psi

 

[yinzer5.9]

also what does the fuel pressure curve look like when the lift pump starts to fail? will it fall to zero immediately or will checking the pressure every fuel stop be sufficient to catch a failing lift pump in time? also i understand running 2 stroke oil can extend the life of a vp how many ounces 2 stroke oil to a tank of fuel is sufficient lubricity?

 

[yinzer5.9]

dont do airdog. fass, and put it on before a tune. thw vp44 needs 14-20 psi

yeah im starting to see more and more negativity about airdog, what about fuel lab and bd diesel?

 

[Stormin08]

fuel lab is a Great product, but currently it appears as if they don't play well with the 2 gens. the ecm trigger signal trips their digital board and the pump doesn't run.

look up the "grey goat build" thread from cumminsdog

 

[nickg]

also what does the fuel pressure curve look like when the lift pump starts to fail? will it fall to zero immediately or will checking the pressure every fuel stop be sufficient to catch a failing lift pump in time? also i understand running 2 stroke oil can extend the life of a vp how many ounces 2 stroke oil to a tank of fuel is sufficient lubricity?

if the gauge is under the hood its useless, you will never see what your fuel pressure is when at WOT or when there is a heavy load on the motor, all it will show is if the filter has plugged up, and that can happen in as little as one tank of fuel

I used to run 1/2 a quart per fill up, VP is most definitely quieter

 

[Junkman]

yeah im starting to see more and more negativity about airdog

Most of it is simply internet regurgitation of what someone else posted. Apparently they have had enough failures that it gets promoted. Hopefully it gets (or is) fixed. My old AD 100 is working fine (today - and yesterday - tomorrow, who knows).

 

[Mopar1973Man]

Here is my notes on fuel pressure.
Mopar1973Man's Dodge Cummins Articles - Fuel Pressure Specification For Bosch VP44 Injection Pumps

Then my notes on 2 cycle oil.
Mopar1973Man's Dodge Cummins Articles - Adding 2 Cycle Oil To Diesel Fuel

 

[yinzer5.9]

well here it is, i know it cant be seen from the cab, but if there is ever a motor hesitation this is the first thing im checking, does anyone know why there are two brass plugs on the filter housing and does it matter which one you use?
Im assuming ones pre filter and the other is after filter thats it

 

[yinzer5.9]

Here is my notes on fuel pressure.
Mopar1973Man's Dodge Cummins Articles - Fuel Pressure Specification For Bosch VP44 Injection Pumps

Then my notes on 2 cycle oil.
Mopar1973Man's Dodge Cummins Articles - Adding 2 Cycle Oil To Diesel Fuel

I read this, and it clears things up a bit, but once you have installed a lift pump, how do you regulate the pressure down to 14-16 pounds? and What lift pump do you think is a better setup? Im tossed between airdog and fass, is there anything wrong with the single filter fass platinums?

 

[Ramitt]

The thing is the vp can pull enough fuel to keep the truck running. Also a half dead lift pump only pushin a few lbs will keep the truck running with no ill signs. This is why a fuel psi gauge inside the cab is critical. Fass is the only way to go right now. Their pumps are designed to only push so much fuel. So about 20 psi is all you will see. 14psi is what you ideally don't ever wanna see below. My fass 150 pushes about 19-20psi at idle and 17-18 driving at all times

 

[yinzer5.9]

The thing is the vp can pull enough fuel to keep the truck running. Also a half dead lift pump only pidgin a few lbs will keep the truck running with no ill signs. This is why a fuel psi gauge inside the cab is critical. Fass is the only way to go right now. Their pumps are designed to only push so much fuel. So about 20 psi is all you will see. 14psi is what you ideally don't ever wanna see below. My fass 150 pushes about 19-20psi at idle and 17-18 driving at all times

i understand that the vp will also lift which is why most people burn them up, thats why i put the gauge on it so i can just pop the hood and look everytime i get fuel, for now till i get a proper gauge set up

and im more than likely going with fass, but ill probly need an apps and to rebuild the rear-end :banghead:

according to mopar man 20 psi is too much and the velocity of the fuel flowing into the pump ( especially on a motor at idle) will actually increase heat and friction in the pump, which according to fluid dynamics, makes sense when pressure is increased and consumption is decreased fluid goes from laminar flow to turbulent flow, thus making heat (why a pond freezes and a stream does not)
so is a 150 gph pump necessary if ur not making 500 hp?

and he said he has his regulated at 16 psi :confused013: i would think a regulator would make the lift pump run harder and burn it up

 

[Mopar1973Man]

Part of the problem is the size of the return port out of the VP44 there is only so much fuel you can get out of that port. Return is on the left and supply is on the right. So going over 20 PSI is pointless.

 

[HMH]

200:1 tw3 2stroke

 

[Brad92]

Most of it is simply internet regurgitation of what someone else posted. Apparently they have had enough failures that it gets promoted. Hopefully it gets (or is) fixed. My old AD 100 is working fine (today - and yesterday - tomorrow, who knows).

I haven't run Airdog. But I do know of two friends personally that have had issues. On one, the Airdog leaked fuel into the pump motor. On the other truck, it pulled so much power it kept popping the fuse and Airdog told him to run his pump directly to the battery without a fuse. He ended up pitching a fit and they gave him a new pump.

My Fass has been good. I just need a sump.

 

[yinzer5.9]

I haven't run Airdog. But I do know of two friends personally that have had issues. On one, the Airdog leaked fuel into the pump motor. On the other truck, it pulled so much power it kept popping the fuse and Airdog told him to run his pump directly to the battery without a fuse. He ended up pitching a fit and they gave him a new pump.

My Fass has been good. I just need a sump.

well when I pulled my sending unit out i put a new 1/2" line on it that picks fuel right up off the bottom of the basket if i hookup a fass (without a draw straw) straight to my main fitting on the sending unit will it work ok and not have 1/4 tank issues?

 

[Ramitt]

i understand that the vp will also lift which is why most people burn them up, thats why i put the gauge on it so i can just pop the hood and look everytime i get fuel, for now till i get a proper gauge set up

But what im trying to get at is a stock truck can run with very low psi and you would never know till its too late. It doesnt take long to burn up a vp especially if its been dealing with it over its lifetime. This is why its so much nicer to have the gauge in the cab that way you can check on it more often. Sometimes they will last hundreds of miles with low pressure and other times they are lucky to make it 20 miles. Its a crap shoot really. Just trying to save you from buying a 1,000 vp thats all

 

[yinzer5.9]

But what im trying to get at is a stock truck can run with very low psi and you would never know till its too late. It doesnt take long to burn up a vp especially if its been dealing with it over its lifetime. This is why its so much nicer to have the gauge in the cab that way you can check on it more often. Sometimes they will last hundreds of miles with low pressure and other times they are lucky to make it 20 miles. Its a crap shoot really. Just trying to save you from buying a 1,000 vp thats all

wow i had no idea they can go that fast without rhyme or reason, well I just ordered a trio glowshift set fuel, boost and egt so hopefully i wont have to replace the vp anytime soon while i save for a fass

and i guess the titaniums dont have adjustment you can just shim the ball and spring check valve so im assuming if i get a fass and its pushing 20 psi i would need to pull the spring out and compress it some?

 

[yinzer5.9]

Part of the problem is the size of the return port out of the VP44 there is only so much fuel you can get out of that port. Return is on the left and supply is on the right. So going over 20 PSI is pointless.

if only some magical drill bit could drill that hole out to 3/8" and not get any filings in the pump haha

 

[Mopar1973Man]

if only some magical drill bit could drill that hole out to 3/8" and not get any filings in the pump haha

Won't do a lick of good. The drill better be able to turn two 90* angles from that port to the distributor where it goes. Sad to say. So as for over pressure and cracking up excessive amount of pressure isn't going to flow much more.