Engine/Transmission (1998.5 - 2002) pump volume

[JeffWhite]

got the in-tank recently, and am wondering if we can settle this question -

I want to check the volume on my new pump, and get someone to supply

comparison data for the old engine mounted pump - I would think that low

as the pressure is, must be low volume, but maybe they did remove a

restriction on the return line as I have heard speculated on. Someone with

a scientific mind tell me how I should test mine so it will be usable to compare

to something known. I would like to just see how much it will push out the

fuel filter drain on a key-bump cycle, but don't know if this will be precise

enough to be any good, and have no data from the old style pump. Jeff

 

[.44 mag]

I've got the same question / concern about the new pump. I had one installed a few weeks ago. I plan on installing a fuel pressure gauge this weekend. I'll get back to you with my numbers as soon as I have something.



Hank

 

[nps]

The previous standard as set forth in the DC TSB for lift pump diagnostics is a MINIMUM of 44 ounces in a 25 second bump-the-starter test period.



My original LP puts out 12psi @ idle and 6psi@WOT. It pumps 46 ounces in the 25 second run.



To test, there is a rubber line between the fuel filter and VP fuel inlet. Take this line loose and attach about 2 feet of line (fuel line, old garden hose, etc) to the hard line coming out of the FF- it doesn't need to be a pressure proof fitting, just a fuel flow guide. Then put the line into a pail and bump the starter. It's a good idea to measure the minimum volume in the pail using water and mark the level BEFORE you run the fuel volume test (the wife gets upset when I use her measuring cups for diesel ).



At fuel prices today, I then would run the fuel through a coffee filter while pouring it back into the tank. :-laf

 

[JeffWhite]

thanks

I will try to do that this wkend and post the results -

I got to clean out my rad fins and relocate the vent tube while I'm at it.

I agree on straining any fuel I run out - probably let the first go, haven't

drained the thing in awhile, might have a touch of water. Jeff

 

[WOT]

got the in-tank recently,

Are you saying you put the newer 3rd gen intank pump into a 2nd gen?

 

[nps]

Are you saying you put the newer 3rd gen intank pump into a 2nd gen?

There is a 2nd gen intank kit available from the dealer. How common the kit parts are with the 3rd gen I don't know.

 

[JeffWhite]

yep

got it put in under warranty, they told me when they tried to order the

old style lift pump, the 'puter would not accept the order. Had to clue

them in on the kit, they had heard nothing about it. Thanks again, TDR

 

[.44 mag]

Here's what I got for fuel pressure with the new in-tank pump.



Idle 11 - 12psi.



Cruise 8 - 10psi.



WOT 5 - 6psi.



This is from a short test run around town with a burst on the highway for a WOT of approx. 3200rpm.



Never had a pressure gauge on the old pump system. How do these numbers sound??



Thanks!

 

[WOT]

Idle 11 - 12psi.

Cruise 8 - 9psi.

WOT 5 - 6psi.

Sounds kinda low unless you have some power mods. My 2000 would hold 8 psi WOT all day long (with a new lift pump & EZ on max setting). Of course they didn't seem to last very long



If the new pump maintains those numbers for 100K miles then life would be pretty good.