what is the fuel pressure i need at the ve pump after the filter ? min -max also who has the best price online for the piston pump ? thanks for any help

 

Cummins spec is 3 psi minimum at idle. The VE has a vane pump inside that feeds the high pressure side of the pump, so as long as you have some positive pressure at all times it will do fine.

I've read that 12 psi is the max inlet pressure for the VE, but the piston lift pump that is designed for use with the VE puts out 16 psi at idle.

 

Isn't the greater worry having enough volume of fuel for WOT operation? Like you say as long as you get it to the pump you're gold. I would think if you have to much pressure you'll cause seal failure in the IP but nothing catastropic.

Edwin

 

If you have positive pressure after the filter at WOT/full load, you have adequate flow. If you had inadequate flow you would have no pressure at that point under those conditions.

Excess pressure is more likely to wipe out the vane pump from thrust loading than cause a leak. Internal pump pressure is in the 80 psi range, the lift pump pressure has little to do with that (unless the flow is inadequate).

 

OK, I'm thinking that a oil pressure light switch might be a better thing to put on the after filter fuel line. That way if pressure dropped below about 4 psi the light would come on. To many gauges are hard to keep track of and sometimes idiot lights are a good thing.

Edwin

 

That would work fine. Just make sure you put a snubber in before it so the switch doesn't get hammered to death.

 

Now you done gone and complicated me again! Where would I get a snubber? I assume it's an orifice with a tiny hole.

Edwin

 

McMaster-Carr is the easiest place. I like the sintered stainless versions myself, the orifice style are prone to plugging. Get the one rated for water and light oils. I have that one on my gauge and the needle is very steady but reacts reasonably fast.

http://www.mcmaster.com/

 

That's a great link! I put snubber in their search and it came up with the exact page I needed. Thanks for your help.

What I'm thinking of is splitting the steel line and adding an inline compression to 1/8 pipe T then adding the oil pressure switch. Your thoughts?

Edwin

 

any info on the lift pump

 

Gonna have to get it and it's associated parts from Cummins. Find a distributor nearby, call em and they'll ship if you aren't close.

 

I think you should get a tapped banjo bolt from Geno's.

 

All the part numbers are in the 1st gen FAQ. Do like Bill said, Cummins will set you up with what you need.

 

thank u all i found the parts at dieselpartsusa pump $123.66 spacer$8.44 and line $22.98 are these allright prices ?

 

Sorry to sort of hijack this thread guys.

I just took a good look and the banjo coming out of the filter has the air bleed in it so do you mean I should get a banjo with a 1/8 female pipe hole for the input to the filter?

There appears to be a union in the fuel line between the filter and the inj pump so I was thinking of putting a T in place of the union.

Edwin