Join Date: Nov 2005
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Cummins Part # 3936320 lift pump is the correct number for the low pressure piston pump for first gens.That number may have been changed, I'm not sure. They will idle around 15PSI and the pressure will drop off as you load things up. The pressure will drop depending on what you have done to the truck. I can drop it to about 4 PSI with the big injectors installed which is not enough. For a mildly modified truck they will work fine.
If anyone finds out there is a new number, let me know and I'll change the number shown in the first gen tech section. There is a thread there called "part numbers for a first gen".
93 D250, PDR Twins HX35&HT3B, 60+# boost,PDR stage 2 head w/o-rings, PDR Cam, modified VE Pump, piston style lift pump, modified 5" intake w/AFE, ATS ported manifold,DTT 89% converter, 4" RIP exhaust, modified tranny, EGT/boost/tranny/tach gauges, TPS removed, a little chrome under the hood. Mag-Hitec tranny and diff. covers. Rear sway bar. Line-x bed liner, after market seats. Single stage Water/Meth system installed. Oversized intercooler w/3" IC lines.
05 Chevy 2500 HDcrew cab 4x4, Duramax W/Allison, 17" Hummer wheels w/285-70-17 BFG's, Banks intake, ported turbo mouthpiece. Predator programmer, Autometer EGT and boost gauges.
Last edited by Paccool; 03-29-2010 at 04:24 PM.