Piston lift pump

[lectro_static]

I was looking around at different lift pumps and found Cummins # 3936317 I cant seem to find any info on it. I THOUGHT I saw somewhere it was rated at 18psi but cant seem to find that again. If it is rated at 18psi will a VE pump take that much in, or is there any way to tell without buying it putting it on and chancing blowing the seal out.

[Mark Nixon]

It's for an 6bt inline pump application.
High pressure, I'm sure.

Mark.

[peobryant]

This is what you need...

[Mark Nixon]

I just downloaded a PDF that shows all kinds of parts and information, for everything from the 3.9 up to the N14s and more.

It's pretty in-depth.

Mark.

[lectro_static]

I just talked to a guy at Oregon Fuel Injection you are correct Mark the pump I was asking about is for an inline. They do carry the 3936320 pump and it sells for LESS then $65, he looked around a bit and found a pump that looks just like those two but is set at 12psi its a delphi #HFP701 and sells for $83.56. Does anyone know what the 3936320 is set at?

Mark would you share the url of where you got the fuel pump info at I think that could be very useful.

[Mark Nixon]

I'm sure SOMEONE here has already found it before, but here's the link:

www.endurancepower.com/media/CATALOG_CUM.pdf

It asks you about saving it right away!

I can imagine myself using it to order parts with, that's for sure!

Mark.

[lectro_static]

Thank you, it does have a lot of useful info

[Richie O]

I just talked to a guy at Oregon Fuel Injection you are correct Mark the pump I was asking about is for an inline. They do carry the 3936320 pump and it sells for LESS then $65, he looked around a bit and found a pump that looks just like those two but is set at 12psi its a delphi #HFP701 and sells for $83.56. Does anyone know what the 3936320 is set at?

Mark would you share the url of where you got the fuel pump info at I think that could be very useful.

My 3936320 is at 13 to 15 psi AFTER the filter so its more then there 12psi unit. I had looked at there pumps ( online that is ) and some guys on DTR bought some of there cheaper ones. I think the cheaper one was in the 7 or 8 psi range. Its been awile since that thread over there has been active so don't hold me to it.

[lectro_static]

On another board BC847 said

With the lift-pump, running PDR "190" injectors with the typically tweaked injection pump, I'm seeing . ..

- Approximately 12psig while free-revving the engine to 2500rpm.
- Approximately 9psig at idle.
- Approximately 7psig under WOT.

Is that about where you are at Richie? I would like at least 10psi at all times but would really like to do it without the expense and hassle of running a bypass regulator etc. Im not at all opposed to running the lift pump that everyone else is, just trying to get a bit more psi

Are you saying that OFI's pumps are not as good? That would be good to know before I buy a pump........

[Richie O]

I'm gonna talk to someone I think bought one. I will get back to you. Also I can draw mine down to 3 psi on a good run. I do have stock filter and lines though. I assume I could increase some with bigger lines and filter.

[PToombs]

With my 3936320 I have 15-16 at idle and from 11 to 14 psi at wot (depending on temps) with my 370's and a maxed pump.

[Richie O]

With my 3936320 I have 15-16 at idle and from 11 to 14 psi at wot (depending on temps) with my 370's and a maxed pump.

Is the rest of your fuel system including the filter stock?

[mprmn08]

mine pumps the same as ptombs and mines about 16 at idle and i only pull down to bout 14 on WOT but i got stock sticks and lines.

[PToombs]

All stock lines and filter, for now. When I get it in it's getting a draw straw, 1/2" lines and a large prefilter. Then stock from the LP to the IP. I'll see what happens with pressure then.

[Richie O]

Well you are making more power so I am not sure why I am dropping more. I have bigger sticks but I am at 300 hp tune right now.