wow, the 2nd gens run 45psi into the P-pump. Thats impressive. I guess I'll stick with the 1st gen piston pump for now. Maybe later I can just get a P7100 in there so I dont have to run a regulator. lol

 

So what where the results? Did You reduce the fuel pressure on the piston lift pump with out using a regulator? I'd be interested to know how You accomplish that. Any new part #'s for this piston lift pumps?

Thank You.

 

I might switch to one of this pumps in the future but I see there are many options and I could use some help on what exactly I need to buy instead of wasting money on something I didn't really need. I know the top for the ve is 15psi so I was thinking if I could just use a simple regulator (one of those that come attached to some electric fuel pumps) or some one actually figured out how to modify the piston lift pump in a way that it will pump up to 15psi but with the same large fuel volume.

Thank You.

 

I have been running the modified pump for a year now, it has the 1st gen pressure spring with the second gen diameter piston. Haven't had any issues, just keeps on working. We never did get the pressure guages put on. Some day i'll get around to it.

 

That's good to know. I haven't been able to find any good deals on the low pressure pumps, so ended up getting a low-priced 2nd Gen pump off the big auction site for my spare. I figure to just throw the smaller spring in it if/when I ever need it.

 

I thought I read that 15psi was the max pressure for the VE or it would start blowing seals, what do You guys do then?

 

They'll take a little more than that, not much. Noboy's exactly sure how much and the failure point is a moving target, depending on the individuial VE. That's why I use the low pressure piston lift pump - 15psi.

 

trust me it sucks when the front seal blows, makes about 15 gallons of oil in the pan and then blows it out the dipstick and blowby tube, not a fun mess to clean up, run a regulator with a stock second gen pump.

 

I am planning on gathering the parts to do this modification to my truck soon. If i run the lower pressure piston pump do i need a regulator? Any other helpful hints or ideas? What about running a flexible stainless line from the lift pump, good idea or bad? thanks everybody.
ez

 

The Dodge Cummins didn't have the Piston Lift Pump option but Cummins B series engines with VE's had an optional "Low Flow" Piston Lift Pumps. If you really dig around on Quickserve you will find some info. There's Low Flow and High Flow piston pumps and three different springs in those pumps. Ylw 6.0 like you took out of your lift pump. Ylw 6.0, Blk 6.7 and Silver 6.8 springs in low flow and Blk in high flow. I thought the #'s were the coils in the springs but after looking at the pics it isn't so. The way to determine low or high flow is to measure the outlet fitting height, low flows have a longer fitting height. And there have been several different vendors and as always the p/n changes regular. The last time I looked the p/n Bill gave actually shows 32-43 gph @ 30psi pump measured flow @ 1100 pump rpm on Quickserve. The volumes they show don't always compute if you do the math, they show LPH in the specs usually but the calculated volume is way more than they would flow, like 190+ LPH etc. If you have a Quickserve paid membership it is an interesting time killer. I wonder what the bigger piston pump would do with the ylw spring myself...

 

The type of spring in these pumps is of a constant pressure design. As such, cutting or shimming the springs will make no usable difference in their operation.

 

Are you able to get to this info on the Preferred Member version of Quickserve, or only the Fleet?

What is the relationship to the springs and pressure?

Yellow 6.0= ? psi
Black 6.7= ? psi
Silver 6.8= ? psi

Are there part numbers on these springs?(available separately, or only in the pump)


Sorry for all of the questions, but knowledge IS power. And I am all about increasing power