pusher pump...thoughts after use???

[jkern]

Those of you that have installed the pusher pump type of lift pump, what do you think after some miles of use? any problems? will it last 100k miles? any pressure adjustment on it, i really don't think that i need 22psi. and does it push through the existing lift pump? sorry for all the questions, just tryin to figure out what is best for my application. i just want 10 psi everywhere from idle to WOT. thanks



jeremy

 

[Morphious]

I have had my "pusher" pump on for about 60k or so, not a single problem with it since. I plumbed around the stock unit. My choice was the mallory 4150M. It came with a regulator, but I opted not to install it. I run around 11-12psi at idle and cruising speed, and during wot, it drops to around 9-10psi. The pump is adjustable by a set screw, but I have never touched it. I mounted it just after the tank along the inside frame rail, cut the fuel line tubing and plumbed it from the pump to fuel filter with -6an ss hose, using swept 90 into a weber carborator adapter to get rid of the banjo bolts. I also opted to use the existing power lines that came off of the stock unit, so I cut the wires and spliced in longer leads to get back to the new pump.



Morph.

 

[RustyJC]

FYI, we just got the gauges in our 2002 last weekend, and I'm seeing 16 PSI at idle both pre and post filter (only have 16 PSI sending units, unfortunately. ) I haven't been able to pull the inlet pressure at the VP44 below 12 PSI at WOT yet, although that's running unloaded. We'll take the 5th wheel out this weekend, so that's subject to change.



The reason for posting is that, although a pusher pump is a better application since pumps want to push rather than suck, maybe, just maybe, Cummins has this lift pump situation under control for 2002. At least it looks promising with 680 miles on the truck, but time will ultimately tell.



Rusty

 

[Steve St.Laurent]

The setup I'm running is still working perfect with about 6,000 miles on it now. Low pressure high volume carter back at the tank feeding the stock pump at the engine. Getting 20 psi driving down the road and a 1 psi drop (19 psi) at WOT. I'll let you know in another 10,000 miles if it's holding up better than my other pumps did - the longest a stock pump lasted on my truck was 15,000 miles.

 

[Jetson]

Be aware that if the stock pump dies, the pusher pump will NOT be able to get adequate pressure through the dead pump. The truck may run enough to get you out of a jam, but you will not see more than 1 to 2 psi at idle. I tried this various ways, pusher connected running through dead stock pump and stock pump pulling through dead pusher pump - never more than 2 psi. This was with Carter pumps. Other types might allow flow through a non-running pump.

 

[jkern]

thanks for the help guys... i think what i will do is mount a pump by the tank and bypass the stock pump. i will route the fuel line into the intake side of the filter. should i get oversized banjo bolts to make the job complete or just use the stock ones. the only other mod i may ever do is a mild set of injectors.



jeremy

 

[Mopar-muscle]

get oversized banjos , that will increase volume , less restriction . you may want to try to rig it so the stock pump is in a backup mode , make a couple connections and away you go ... thats my plan when i finally get around to it , for now 6 psi at over 100mph and a 14. 38@ 91. 7 in the quarter is fine by me with one pump ... .