fuel pump question - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 8 (permalink) Old 03-18-2011, 07:20 PM Thread Starter
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Unhappy fuel pump question

i bought my 1990 dodge w250 off a friend and he put a electric pump on it. well do to a failure i have to replace it but don't know how much pump i need can any one tell me about how much gph "gallons per hour" i would need. and i know i cant go over 14 psi or i risk the ve's life.
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post #2 of 8 (permalink) Old 03-19-2011, 01:17 AM
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im pretty sure you just buy one that fits the tank. like how many gallon tank it is. unless your buying after market look into buying a FASS pump. talk to them they will hook you up with what you need!
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post #3 of 8 (permalink) Old 03-19-2011, 12:27 PM Thread Starter
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well most of the parts stores around here have no idea about diesels. they realy look at me weird when i ask the about how many gph a pump can flow the say it is all about psi, so i was hoping i could get a ball park figure. my friend said i need a 100 gph + but that seams way more than i need
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post #4 of 8 (permalink) Old 04-10-2011, 07:33 PM
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napa has a real nice electric one listed for rv's its plenty and will last your lifetime
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post #5 of 8 (permalink) Old 04-22-2011, 05:13 AM
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any pump that flows 80GPH at 10PSI min has seemed to never fail even on the big all out trucks I really like the airdogs just about everything that comes through here we put either the airdog original 150 or the airdog II 165 and guys love them and only had one issue
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post #6 of 8 (permalink) Old 04-22-2011, 01:23 PM
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What are your plans for the truck?

If your only going to use it as a DD and don't plan on massive HP. The stock mechanical lift pump will work fine.

93 W350 w/duals, fuel pin turned, 6X.018" injectors, 4" exhaust, 3" air intake horn, HX40/16, G56 /SBC Con-OFE, 307's axles' 2" skyjacker lift, B&W flatbed
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post #7 of 8 (permalink) Old 04-22-2011, 08:20 PM
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I'm going this route on mine, to replace the diaphragm pump. It is a low pressure piston pump. Similar to, but not exactly the same as what is on the P-pumped trucks.


"Some people are educated beyond their intelligence."

'93 W350 CC, LE, 5spd, HTT modded H1C, 4" DE

Sold- '99 3500 Q/C, SO CTD, 4x4, 5spd.

Traded off- '97 3500 C/C, 4x4, CTD

'92 W250, LE, CC, CTD w/ tweaked pump (SOLD)


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If Obama is the answer, it must have been a stupid question.
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post #8 of 8 (permalink) Old 04-22-2011, 08:24 PM
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A Cut and Paste from a different site. Posted by jhedge on www.1stgen.org -


The piston lift pumps have been manufactured for Cummins by 4 or 5 companys over the years and Carter was probably the best (they were my favorite) but there probably isn't a whole lot of difference.

There is actually a family of pumps that were used on the B and C series in a bunch of different applications, some pumps were used on both engines and some were only used on one or the other but they all look basicly the same (this is why the B-Series engine gets a spacer between the block and the pump). There are around 7 pumps in the family and 4 of those are identified with a color coded dot, which will be either red, blue, green, or purple (Cummins called it "violet"). The dots moved around over the years, but they were always applied by the pump manufacturer and since Cummins paints the engine after it's assembled, you will only see the dot if you buy one as a replacement part (which are sold unpainted), if you pull it off another truck the paint dot trick doesn't work. I think some of the pumps did have the dot on the bottom of the primer boot, so those might show up after the engine was painted. All of the pumps have been revised over the years and received new part numbers 6 or 8 times.

One pump in the family of lift pumps flows a lot less fuel than the rest of the pumps, this is the one with the purple dot. At 800 RPM (That's 800 at the crank, 400 at the cam) it's flow profile looks like this:





At 2200 RPM, it looks like this:






It will actually put out more pressure then that, max should be around 15 psi.
Here are all of the part numbers of the purple dot pumps, in order (ie: each part number superceeded the part number listed above it):
3918076
3930349
3932228
3933256
3936320
4944714
4988751

Why so many part numbers? The earlier pumps were kind of noisy and some material changes were made to some of the seals in the later pumps to make them better compatable with ultra low sulfur diesel and biodiesel, and then some of the supplier change stuff...

The 2nd gen dodge that used the P-pump had the lift pump with the blue dot, which is the same as the green dot except for the outlet fitting.

"Some people are educated beyond their intelligence."

'93 W350 CC, LE, 5spd, HTT modded H1C, 4" DE

Sold- '99 3500 Q/C, SO CTD, 4x4, 5spd.

Traded off- '97 3500 C/C, 4x4, CTD

'92 W250, LE, CC, CTD w/ tweaked pump (SOLD)


"Obama = Hoax and Chains"

If Obama is the answer, it must have been a stupid question.
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