Factory Lift pump rpm and HP limits on a 160 pump

chad256 said:
I have a 180 pump, but I have gone 10.50 at 132 with a stock lift pump fed by a cheap electric pusher pump. Made 840 on the dyno. Been planning on upgrading the fuel system but just been pushing it off since it seems to be working alright.
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What does the pressure look like when doing a wide open run ?
 
I ran an eBay 140 gph on a relay feeding a stock lift pumps for a few years, than I got a new pump from the Cummins dealer and swapped a comp cam #375 spring iirc and left the screen out of the pump. I didn’t notice much of a difference until I removed the pusher pump. With the comp cam spring the pusher became a restriction. My precision industries billet input lasted less than a week after I removed the pusher. My fuel pressure can still get pulled down but it takes a little longer. Throttle response seemed better also.
 
FWIW, I just changed over from 3/8” lines to a 5/8” suction from sump, ported fittings, 1/2” dual feed and saw nearly 10psi gain at all RPM. Stock piston pump.
 
SCHMITTY said:
I’m going to try a belt driven lift pump from PDD
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I was going to as well, was really looking forward to trying it. Just got tired of waiting since they've been on backorder so long, so i went a different route. Hopefully they are available soon and we can see how they work.
 
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