Engine/Transmission (1998.5 - 2002) discussed with intank lift pump!

[Gregg Mig]

Got my truck back on wednesday after being tied up at the dealer for a week in a half for a new in tank lp and vp. After getting home and hooking up my mech, fuel pressure gauge,its showing barely 7 psi and it takes several minutes to get there. At load its about 5. I bit the bullet and ordered a Fass fuel pump kit with the filters. I hope this was the right discission on my part. I do not want to fry the new/ rebuilt VP even though its still got warranty. I will not tie my truck up again like that. Gregg

 

[steved]

Got my truck back on wednesday after being tied up at the dealer for a week in a half for a new in tank lp and vp. After getting home and hooking up my mech, fuel pressure gauge,its showing barely 7 psi and it takes several minutes to get there. At load its about 5. I bit the bullet and ordered a Fass fuel pump kit with the filters. I hope this was the right discission on my part. I do not want to fry the new/ rebuilt VP even though its still got warranty. I will not tie my truck up again like that. Gregg

You won't be disappointed with the FASS as far as fuel pressure/volume.



You could have also put the stock LP back in place and used the intank pump as a pusher...



steved

 

[Gregg Mig]

I was going to go that route but when I saw that the in tank pump was putting out such low pressure I did not want to deal with this, also I read a post about someone getting a bad batch of fuel with sand and debris in it,and I don't think that's going to help the pump. At least with the fass the fuel goes the filter first. I hope that's true?

 

[steved]

I was going to go that route but when I saw that the in tank pump was putting out such low pressure I did not want to deal with this, also I read a post about someone getting a bad batch of fuel with sand and debris in it,and I don't think that's going to help the pump. At least with the fass the fuel goes the filter first. I hope that's true?

I was the one with the sand... yes, it will help... my FASS actually increased my fuel mileage some.



steved

 

[maxburk]

I have the same problem with pump pressure. I installed a pusher pump and am running 13psi normal and 12 WOT. I went with a carter pump since I already had two in stock.

Watch your pressure. I just had a problem with the relay for the intank pump not picking. No voltage to the relay. I rewired the thing to the ignition since I had no idea where Dodge was getting the voltage.

I have a 2000 with 6sp and H/O

 

[blacksheepdiesel]

I would suggest you locate the fuel sending unit assembly that the dealer took out of your truck and put it back in when you remove the in-tank pump. Recently installed a FASS after the in-tank pump had been installed and it was not fun trying to get a hose cut the correct length to suck from near the bottom of the tank. With the original fuel sending unit assembly it would have worked much better.



Trent

 

[sg5054]

Gregg,

When your "new" VP gives up the ghost, go see Chip @ Blue Chip Diesel in Greenville, NH.

www.bluechipdiesel.com

My current pump, #3, is from Chip and the truck runs like a champ.

 

[Gregg Mig]

Thanks guys, I feel better about getting the fass.

 

[pwr2tow]

Your money, spend it the way you want but I thought I would throw out a tid bit.



Pressure means squat, it's fuel flow you want, GPH.

Your VP44 doesn't need any more than approx. 45 GPH.

You can have a pump that flows 100 GPH at 1 PSI.

You can also have a pump that flows 30 GPH at 80 PSI.

The point is don't be too concerned about fuel pressure, alot of advertizeing hype going on.



It is well known that as long as there is positive pressure at the injection pump inlet and your flow test shows the recommended amount of fuel flow there is nothing to worry about.



Flow test: put a bypass valve inline from filter to injection pump, bump starter, use a timer, measure fuel, take fuel measure X's time that equals 1 hour and you have flow rate.



Example only:

3 quarts in 1 minute run time X 60 minutes in an hour = approx. 45 gallons. Don't have a calculator on me for exact numbers but you get the picture.

 

[steved]

The documentation regarding the VP44 indicate it should be at 14psi ideally.



I was told by a Cummins Service Writer (on the topic of the $65 lift pump that I bought Tuesday) that the VP44 should have an inlet pressure of 13-15psi as directed by Bosch. He offered this in conversation, I didn't ask him for the pressures at all.



I agree with your statements regarding pumps, just pointing out that while volume is important, so is pressure it seems.



steved