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Old 10-01-2009, 09:31 PM   #1 (permalink)
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Low Pressure Piston Pump $65?

Oregon Fuel Injection has a Cummins Fuel Supply pump part #3936320 listed on their website for $65. Am I mistaken or is this the correct part number for the low pressure piston pump? Isn't that half of what it normaly costs, are there non-cummins pumps on the market?

Here is a link to the page, scroll down to the very bottom,
2nd to last item.
Oregon Fuel Injection, diesel fuel injection specialist, rebuilt turbochargers, injector, injection pumps and diesel performance products.
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Old 10-01-2009, 09:41 PM   #2 (permalink)
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Those are Delphi part #s. Delphi products are generally very good quality. (Delphi was formerly Lucas Industries)
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Old 10-01-2009, 09:50 PM   #3 (permalink)
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So that is the right pump if I wanted to convert my stock lift pump? I read somewhere that #3936320 was an obsolete number. Thats a pretty good price, I just don't want to end up with the wrong pump.
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Old 10-01-2009, 10:17 PM   #4 (permalink)
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I have yet to hear back but a couple guys have gotten that pump. One person reported a lower then normal pressure.
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Old 10-04-2009, 12:16 AM   #5 (permalink)
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There was a big thread on this pump over on another site, I forget which. Apparently it's a low low pressure piston pump that matches output of the stock diaphragm deal. Not an upgrade at all as a new diaphragm is $20 cheaper.
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Old 03-29-2010, 01:33 PM   #6 (permalink)
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you can check out some comparison products at Ingersoll Rand Fluids
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Old 03-29-2010, 03:21 PM   #7 (permalink)
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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".
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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.

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Old 03-29-2010, 06:41 PM   #8 (permalink)
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My local Cummins dealer said the new PN replacing 3936320 is 4988751.

E:

Which PN is the high pressure piston pump that's for the 94-98 ppump trucks?
I think I want to go that route with a regulator.
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Old 03-31-2010, 02:36 AM   #9 (permalink)
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I have the Lucas low pressure piston pump, and it runs pretty steady at 10psi; pulls down to 9 on a hard run in a stock truck. I'd recommend it only if your stock pump goes out, and you dont have the cash for a Cummins/ Carter pump (i.e. myself, 5mo ago).

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Old 03-31-2010, 06:09 AM   #10 (permalink)
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I bought a used low pressure Cummins piston pump for 100.00 and felt pretty good at that.

$65.00? I'd say that sounds like it isn't the same thing.
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Old 03-31-2010, 11:15 AM   #11 (permalink)
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hey-Hey!!!,
Been considering a piston lift pump myself. Saw a thread showing the usual VE and a higher pressure variant. The higher pressure variant had a stiffer spring and a larger bore piston( the VE one was sleeved down ). Now if this one is otherwise mechanically the same, one could swap springs( if that part is available by itself ) and be good to go.
cheers,
Douglas
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Old 04-06-2010, 05:04 PM   #12 (permalink)
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Douglas2- yes, you can do that. DTanklage on 1stGen had some part numbers to use a 2ndGen pump, swap out some springs, and have a high flow, low pressure lift pump. Theory is, you have more volume, but the same pressure as the 3936320 pump.

DP
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