Lift Pump Puzzle....

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Aug 21, 2006 | 10:21 PM

#16

Mopar1973man

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Joined: Apr 2004

Posts: 2,148

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From: New Meadows, Idaho

Quote:

Originally Posted by GrampZ

Switched to P4601HP, moved it to frame rail near tank. Used big banjo on filter inlet. Should have seen 18 psi, no? Fired it up and got 10 psi. 10 psi idle and 9 psi WOT. I am puzzled?! Used to see 15 idle and 9 WOT. ??????
Double checked with another gauge, same result. Looks like I'm getting a well regulated but low pressure flow.
Label on pump sez it should be used with Part #XXXXXXX regulator....
I can see a regulator to lower pressure if it's too high. But ***? Parts store has another pump coming tomorrow. Guess I'll try that and see what's up.
Any ideas?

GrampZ

I've used the exact same pump as you and got the same results... I sent that one back and went to a Cummins shop in Boise and ordered a Campaign pump. I'm now seeing 15.0 @ idle and 13.0 @ WOT... This is also with the Vulcan Big Line Kit...

I got to admit that the 4601HP pump looks just like the OEM LP pump... but I think there is a difference in the internal regulator...