Alternative Lift Pump(s)

[Greenleaf]

Guys,



Any of you ever set down next to a glowing fire and curl up with your 5. 9 Service and Repair Manual? (Cummins # 3666087-01) It's a real good way to get to know your engine. It will give you insite to other aplications as well as HP ratings/rated load speeds etc. etc.



Listing of two types of fuel lift pumps found;



Diaphragm and Piston



Of particular interest is the piston pump used on B series engines equipped with the distributor injection pump.



Part no. 3918076 and part no. 3918000 piston pumps.



Will these work on our engines? (to supply increased flow to a high performance VE) I'm thinking the cam may be different as they are used on much higher HP engines.



The engines using the P7100 injection pump have a different part no. listed. In fact the book gives a listing of about 12 different lift pumps and corresponding flow volume.





BTW anyone ever wonder what the little shield is at the rear left corner of our cylinder head is for?? KSB 3-ohm resistor



-S

 

[glhs]

I am running one of those piston pumps on my truck. I need to look at the part # and see which one. I had to grind a little of the sound insulation off to fit.



Kurt

 

[Greenleaf]

Please do that!! PLEEZZ



I spoke with the designer of the FASS unit and it seems this is the way to go. I'm still searching for other options as well. There are many, however with the higher HP output and cooler EGT the FASS unit claims, it's looking more and more lucritive to go this route.



Will the piston pumps bolt up onto out bolck and operate off the cam with out performing any major strucural modifications... ... ... ... ... ... ... ??????? Anyone know.



Cummins lists about 12 different piston pumps. I'm thinking they are all basically the same, however they do list different flow rates in the spreas sheet.



What does flow rate have to do with pressure?? I'm looking at a specific pressure and don't know much about the flow rate.



I was told with the FASS unit, I'll need 9 psi @ 95 gmh



I'll bolt up a piston pump to my truck but the plumbing will have to be modified and do not wish to go that route if'n it ain't gonna work, i. e. pump fuel.



sCoTt

 

[Greenleaf]

More news on the FASS unit...



The 95 gph unit was recomended. The 150 gph can pull more fuel than our tank pick-up can allow in some cases.



The LP is adjustable with use of springs.



Recomended that the OEM LP and filter is bypassed.



The FASS LP will operate when ever there is power supplied to the motor. Pulls about 5 to 7 amps. Power is to be supplied at both cranking and on position. Fittings are sold to by-pass the OEM eqipment and feed the VE direct.



EGT's are reportedly reduced a significant amount. Throttle response is improved as well as cold weather starting. Engine noise is to be reduced. HP is to be increased.





If this information is accurate, I'd hate to spend three hundred on a system and not gain anything when I can have all this for 550. 00



I need to reasearch the piston pump idea further.



-S

 

[JLEONARD]

cold weather starting

For this to be improved it would have to start the truck when I put on my coat.

Jay

 

[JLEONARD]

What does flow rate have to do with pressure??

Depends... you need to make sure both attributes meet what you need.



You can have lots of pressure and little flow... an example is a fuel injector.

You need to match flow rates to rpm and make sure the pump can maintain a certain pressure at that point in order to keep the injection pump fed.



I'd be surprised if our fuel system would allow 95 gph... . My marine install manual calls for full 1/2 inch ID fuel lines to supply an P pump whose lift pump circulates 63 GPH (at a nominal 22 psi).

What do we have for line ID... 5/16? Fittings are smaller right?



By the way, what fuel rate are you thinking about?

An example of fuel burn rate as a ballpark estimate might be the marine 370 hp B series. . I happen to have a spec sheet handy... . it's fuel consumption (fuel burn) is listed at 19. 3 gph at 3000 rpm and 370 BHP. So you need that flow rate PLUS whatever the VE pump returns... probably 5 gph max.

Total being say 25 gph for round number's sake.

Make sense??

I can look up more numbers at home.

Jay