Engine/Transmission (1998.5 - 2002) who has the Best VP44

[JohnBoy5]

When you look at the placement of the poor VP44 it's a wonder they don't burn up before they do. They're all tucked in between the engine block on one side, the TPS housing above, vacuum pump below and timing cover to the front. Might as well have put it in an oven.

On my wifes Jetta, which has a Bosch distributor type pump similar to the VP, the IP is mounted in front of and away from the engine somewhat. It receives cooling air from the fan before that air ever gets to the engine. These pumps almost never fail and they don't even have a LP feeding them.

There was a nice write up a few years back on cooling the VP. I think what we came up with is cool, clean fuel at a decent pressure (13. 5psi comes to mind) and some sort of air cooling to the VP.

Here... I just found it:

https://www.turbodieselregister.com...emperature-input-vp44-80-100-your-inputs.html

Ok thanks for the great info on that. i can see i have a lot of reading todo and i can asure you that i will be making some sort of modification to help cool the IP now.



Have you done anything for your VP?

 

[JohnBoy5]

i might have misdiagnosed my problem. my lift pump pressure was about 25 psi. i lowered it to 17 and have not had a moment trouble with it since. why when i first put my fass system in was the 25 psi ok then all the sudden it is not? the pump seems to run 10 times better with the supply pressure starting at 17 and only dropping to about 14 or 15 wot... any thoughts on this?

 

[JMetzger]

JohnBoy5, If you are now running those pressures your VP 44 should be Dumb Fat & Sassy. I have a FASS HPFP 95 & that is what I run on mine. How did you change the pressure? As far as cooling down I try to let mine idle for 5-10 min before shut down. Chip Fisher from Blue Chip diesel is working on a way to keep the fuel pump running after shut down. You might go on line at bluechipdiesel.com & read about it. It is under New Product To Make VP44 Run Longer.

 

[JohnBoy5]

JohnBoy5, If you are now running those pressures your VP 44 should be Dumb Fat & Sassy. I have a FASS HPFP 95 & that is what I run on mine. How did you change the pressure? As far as cooling down I try to let mine idle for 5-10 min before shut down. Chip Fisher from Blue Chip diesel is working on a way to keep the fuel pump running after shut down. You might go on line at bluechipdiesel.com & read about it. It is under New Product To Make VP44 Run Longer.

i ordered some springs from daves diesel and you take off the return line and the fitting that goes from the fass pump and change the spring. more seat pressure on the spring = more psi. so i lowered mine from 25 to 17. this truck has never run this well since the fass system. i figured for a few $ i would try the spring and who would have though a few psi would change things this much...

i have another spring to lower it a tad more that i might try and see what it does. but i am not sure i will do that yet. it only takes about 2 min and a little diesel fuel down the arm and arm pit lol!

o i am on the list for the vp44 cooling system beta testing thing also! been on it for a while...

 

[AlaskanCummins]

Blue Chip all the way baby! I went with a MWFI first go-around and ended up very dissapointed.

 

[JohnBoy5]

Blue Chip all the way baby! I went with a MWFI first go-around and ended up very dissapointed.

What is MWFI?

 

[AlaskanCummins]

Sorry so long.....



MWFI is Midwest Fuel Injection; a compay that has had mixed responses on this site.



Some have had good luck, others bad. I had bad.



Blue Chip is twice the price, but he's built twice the pump.

 

[monkeyman]

I am doing an experiment, maybe not this year as its getting cooler, I bought a Mercedes Fuel cooler on e-bay, fuel runs through it as well as freon to cool the fuel.

Rick

 

[krtcummins]

After reading the info on the Blue Chip site, I would say they would be the one to buy a pump from. I also like the upgraded "Special X" pump that makes more HP. Great pricing for what you get.

 

[DEWright]

Sticks, I am running a ddrp fass and it had low pressure from the factory, I changed the spring out at their recommendation and it idles about 22psi. Running it drops down below 20 but never below 10 when hammering on it. I heard the same as what you are saying about the higher pressures that this will not hurt the pump because some of the fuel is being returned to the tank. You seem to be up on the real deal. THx.

 

[JohnBoy5]

my question is and i think you might know the answer. like i stated i had about 25 to 26 psi at idle and about 22 at wot. when i lowered the pressure to about 17 and 14 it seems to run better and starts every time. whats the deal with that?

From the mouth of Bosch... "The VP44 requires a minimum of 10 psi for reliable operation and longevity"



Worked for a Bosch warranty and rebuild shop for several years. We were also the supplier for several DC dealers and other distributors. Central Motive Power, Denver CO. 1 year warranty, no mileage. All new internal components and computer board, 75% of the time a new housing.



If 6 psi was acceptable, then we (my personal experience included) would not have seen so many VP failures from the carter pump dropping to half output... 7psi, let alone the DC in tank pump fix that was "Flow" not pressure and would often drop to 0 psi within 10 minuets.



Maximum pressure... that one I can not remember, but I have done dozens of combination in tank transfer pump and OEM block mounted pumps that put out 22-25psi and those trucks never had any issues.