92 VE pump fuel Pressure??? - Dodge Cummins Diesel Forum
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View Poll Results: How Much Pressure
3-5 0 0%
5-10 4 22.22%
10-15 14 77.78%
Voters: 18. You may not vote on this poll

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Old 12-06-2011, 10:41 AM   #1 (permalink)
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92 VE pump fuel Pressure???

How much fuel pressure is safe for a VE pump. We put an air dog on my dads 92 and it's running 18 psi. At this site 92 Ram engine specs it shows 18-24 at idle but ive heard that 18 will blow the seals....??? What is the proper supply pressure for a VE? Thanks in advance. BTW its a Brand New injetion pump Thanks!!
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Old 12-06-2011, 11:22 AM   #2 (permalink)
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The factory service manual says the stock fuel pressure is 3-5 PSI and below 3 psi replace the LP. Yes to much pressure will blow the seals out of the IP. When they run high pressure they locktite the seals in.
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Old 12-06-2011, 01:43 PM   #3 (permalink)
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yea.............what he said............

I never really understood that cuz a LIP seal isn't designed to withhold more then 14 psi or is it 16(??) so........lock-tite on the steel body of the seal isn't going to do anything for the LIP..............

Case in point; the John Deere fuel pump. It literally BLOWS the lip out, not the seal's steel body..............
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Old 12-06-2011, 01:48 PM   #4 (permalink)
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I never understood why anyone ever needed to run over 5-7 PSI if you run a gauge you can tell if your pump isn't putting out enough. I run a stock LP and don't have any problems.
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Old 12-06-2011, 02:24 PM   #5 (permalink)
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Same happened to me when I put my ad150 on it could hit 20 at times at idle
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Old 12-06-2011, 02:45 PM   #6 (permalink)
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just with my injectors and turning up the pump i could pull my FP down to 0 as soon as i mashed the pedal, so i had to upgrade.

if you can hold a little preshure theres no need to change it.
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Old 12-06-2011, 03:46 PM   #7 (permalink)
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yep pretty much the same here. ive also gone through 3 stock lift pumps in the past 3 years so im gunna try an electric one out
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Old 12-06-2011, 04:27 PM   #8 (permalink)
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I run the OE piston lift pump because it puts out more flow. With the diaphragm pump (and engine mods) I see O psi of supply, thus, per industry standards,I need to see minimum of 3 psi...............which is actually TOO low in the real world as we have found out with moddified engine operation.

Cummins "thought" that the engine mounted electric supply pump on the ISB engine would get the job done, but, again, in the real world, it don't.
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Old 12-06-2011, 10:27 PM   #9 (permalink)
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Hows teh piston lift pump working on ur first gen?? i was thinkin bout doin one of them. would u recomend it?? this it the one im looking at. 89-93 dodge 1st gen low pressure piston lift pump
Which piston lift pump do u have?

Thnkx!
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Old 12-06-2011, 10:42 PM   #10 (permalink)
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With the mods in my sig, I can bring fuel pressure from 15psi to 10psi when at wot.
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Old 12-07-2011, 03:10 AM   #11 (permalink)
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Quote:
Originally Posted by Greenleaf View Post
yea.............what he said............

I never really understood that cuz a LIP seal isn't designed to withhold more then 14 psi or is it 16(??) so........lock-tite on the steel body of the seal isn't going to do anything for the LIP..............

Case in point; the John Deere fuel pump. It literally BLOWS the lip out, not the seal's steel body..............
that's exactly right. The misconception is the seal pushes out of its bore. That's not the case. There was actually a guy on DTR who accidentally put a second gen piston lift pump on his mess and filled his case with diesel. Turns out the lip of the seal where it mated to the metal had separated/failed. Too bad I found this info out after machining and locktiting small screws over the edges of the seal...

More related to the OP. I've heard guys running up to 17-18 psi and never heard of a failure.

Like mentioned OE spec is something like 3-5 psi. It should be 10-15. I'd be inclined to say anything at/up to 15 is tried and true so keep it below that, but above the OE recomended low pressure of 3. Even though I'd think that's kinda too low myself...
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Old 12-07-2011, 07:06 AM   #12 (permalink)
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pump no. 3936320; This is made for the VE injection pump. There are a few items which require change to utalize this pump.
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