Engine/Transmission (1998.5 - 2002) Pusher pumps questions

[easleyj1]

I am about to replace my vp44, but before I do I think I want to modify the fuel system to provide #1 more fuel pressure and #2 cooler fuel. My first question is if I add a pusher pump will I be able to maintian 14+ psi fuel pressure under load on a stock truck? Is my understanding correct that this is the minimum pressure needed to keep the VP44 cool through by-passing? Will stock fuel plumbing from the lift pump to the VP be ok? What pressures are those that have pusher pumps feeding the stock lift pump getting. What pumps are giving the best service as pushers. I've had my eye on the Holley but am open to suggestions. Are there reasonably priced pumps available that will meet my requirements and eliminate the stock pump? I am not able to afford Fass or the mechanical rig. I feel that I should be able to do a very nice install for around 200. 00. Comments and suggestions are welcome. Thanks.



Jonny



Ps With my stock LP I have 15 psi idle, 9psi WOT under load.

 

[JKinney]

I along with other members have had great luck with this http://www.vulcanperformance.com/servlet/StoreFront

Vulcan big line hose kit and move your lift pump to the frameMy preasures are 14 idle 12. 5 underload

 

[LOtero]

I along with other members have had great luck with this http://www.vulcanperformance.com/servlet/StoreFront

Vulcan big line hose kit and move your lift pump to the frameMy preasures are 14 idle 12. 5 underload

ill second that, best hundred bucks youll spend

 

[Turbo1Ton]

Just curious, what, other than the line sizes, is the difference between the one direct from Vulcan and the one that Geno's carries? The one from Geno's is only $70 and it says that there was no noticeable difference between the big line and this one.



http://www.genosgarage.com/CoastalData/showdetl.cfm?&DID=30&Product_ID=1943&CATID=1

 

[easleyj1]

Thanks for the replies. I don't have a problem with purchasing the big line kit in fact I had already considered it, But I want to have a minimum of 14 psi at wot underload. If I understand what I have read Bosch says 14 psi is the sweet spot. This is a work truck and it spends lots of time underload. I think that to get the pressure I'm looking for a pusher will have to feed the stock pump. Is anyone running two pump config like this. It may not be a good idea thats why I'm asking. All I know for sure is I don't want to toast another VP. By the way all 4 of my lift pumps were replaced before they failed. I watch fuel pressure like a hawk.



Jonny

 

[CCutshaw]

Just curious, what, other than the line sizes, is the difference between the one direct from Vulcan and the one that Geno's carries? The one from Geno's is only $70 and it says that there was no noticeable difference between the big line and this one.



http://www.genosgarage.com/CoastalData/showdetl.cfm?&DID=30&Product_ID=1943&CATID=1

Goog question I also saw this one.

http://www.vulcanperformance.com/servlet/the-13/Vulcan-Big-Line-System/Detail

 

[Gary - K7GLD]

I've used this pusher setup since my truck was nearly new - it has worked flawlessly for 40 plus thousand miles and 4 years:



#ad




It is a plain Carter 4600 pump, installed down on the frame at the fuel tank - the added filter seen was removed a year or so back because I have several other filters in the line, and it was no longer needed. I get about 22 PSI at idle, 18 PSI down the road empty, and 15 PSI towing in the hills - all PSI readings take right at the VP-44 fuel inlet - all STOCK lines and fittings.

 

[easleyj1]

Thanks Gary, that was good info. Just to be clear you are running the Carter 4600 as a pusher to the stock LP.



Jonny

 

[Gary - K7GLD]

Thanks Gary, that was good info. Just to be clear you are running the Carter 4600 as a pusher to the stock LP.



Jonny

YUP - and with my mods, I *should* be up around the 400 HP level - absolutely NO problem with this setup providing more than adequate PSI under the heaviest RV towing loads so far!

 

[wlowe]

Gary,



Is that picture before you installed the by-pass or have you removed it. I used your install to design my own but I used a carter check valve as a bypass. Got it from Summit Racing, works great and only cost $20, part # CRT-169-1002 . I pulled the fuse on the pusher and only lost about 1 psi throught the check valve. Thanks for the install info.



Bill

 

[Gary - K7GLD]

Gary,



Is that picture before you installed the by-pass or have you removed it. I used your install to design my own but I used a carter check valve as a bypass. Got it from Summit Racing, works great and only cost $20, part # CRT-169-1002 . I pulled the fuse on the pusher and only lost about 1 psi through the check valve. Thanks for the install info.

My pusher has gone thru several "evolutions" over the years - same pump - but yes, the later added bypass valve to permit fuel flow in case the pusher fails is still there - here's a later pic:



#ad




Since THAT pic, I've added a frantz sub-micron fuel filter down the line immediately in front of the stock FF, so have removed the FRAM fuel filter in front of the pusher seen above. My bypass works well too - about the same 1 PSI drop you mention when I disable the pusher - now I need to do the same on the stock LP for the same reason...



Here's a pointer to the thread here on TDR for the bypass valve used in the above pic - and I'll check the part # for the one you mention above - sounds interesting! Thanks.



http://turbodieselregister.com/forums/showthread.php?t=59880