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06-11-2010, 05:16 PM
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#1
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Name: Kronic_187
Title: Mekanical injection junky
Status: Not Here
Join Date: Sep 2009
Location: British Columbia, Canada
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Posts: 1,343
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Max fuel pressure to put on a p7100
alrighty.... just wanting a genral consenus of how much is "max" pressure you should be running.... currently i have mine set @ 35-40ish
here some guys crank it to 50
@ what point are the seals "thought" to be pushed and fuel runnin into the oil ???
__________________
96:CCLB/4x4:NV5600/3250DD, 178/208, 7mmDV's, 5x.016, 155*, 2095, 4GSK, H11, 61.5/68/.9-88/96/1.32, Hammy VS/Manton PR, Dual 3.5" Pusher, 1/2"Feed-3/8Return,6" longarm, Junkyard Freespin Kit
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06-11-2010, 05:49 PM
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#2
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Name: Btp 2332
Title: Too Much Time
Status: Not Here
Join Date: May 2008
Location: Curtisville PA
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Posts: 1,430
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Have mine around 40-45psi on my new air dog.
__________________
1994 CTD tow rig /2012 Dodge Challenger Rt 11.51
1998 12v 11.46@116.5 S475 sold
Dads 97 12v-10.78@125 S480 sold
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06-11-2010, 05:56 PM
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#3
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Name: Valair1
Title: Valair Inc. Clutch
Status: Not Here
Join Date: Jul 2008
Location: Crowley Texas
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Posts: 2,498
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Dam'n I only got mine at 30, will boosting it up help?
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06-11-2010, 06:21 PM
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#4
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Name: Btp 2332
Title: Too Much Time
Status: Not Here
Join Date: May 2008
Location: Curtisville PA
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Posts: 1,430
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I set mine there because my old Walboro pump drained down to 0 last time I went drag racing. Truck is strong with this Air Dog, I took it for a ride and got on it pretty good, fuel pressure guage moved maybe a lb or two stayed around 40psi.
__________________
1994 CTD tow rig /2012 Dodge Challenger Rt 11.51
1998 12v 11.46@116.5 S475 sold
Dads 97 12v-10.78@125 S480 sold
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06-11-2010, 06:38 PM
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#5
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Name: 01PPUMP
Title: Too Much Time
Status: Not Here
Join Date: Aug 2006
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Posts: 1,164
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40-45 psi is plenty of pressure there is no gain above that. As for max pressure the seals will live a long time well over 50psi I would be more worried about cavitaion and eroding on the inside of the pump with anything over that. Dual feed with 5/8 line at 40psi and you will have plenty of psi and volume.
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Northeast Diesel Service
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06-11-2010, 06:44 PM
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#6
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Name: flcrawler
Title: Green Behind the Ears
Status: Not Here
Join Date: Jun 2009
Location: Florida
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Posts: 64
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I have seen as high as 50 at wot, with a belt drive. Installed the pump about 3 months ago, no problems yet.
__________________
2000 2500 qc/lb 4x4 5-speed, GDP fuel boss lift pump, 180 P-Pump,4k gsk.
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06-11-2010, 08:38 PM
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#7
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Name: White Knight
Title: Too Much Time
Status: Not Here
Join Date: Aug 2007
Location: SLO/Ferndale California
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Posts: 1,380
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Quote:
Originally Posted by 01PPUMP
As for max pressure the seals will live a long time well over 50psi I would be more worried about cavitaion and eroding on the inside of the pump with anything over that.
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I have to ask, why? Cavitation occurs from a sudden extreme pressure drop, and erosion is a result of flow. Since pressure has almost no effect on flow I do not see how either could be a problem.
__________________
Derek
98 Dodge 2500 12 valve, 5-speed, 4x4
It's not what you buy, its what you build
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06-11-2010, 09:46 PM
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#8
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Name: Chevycummins
Title: Bad case of Tinkeritis!
Status: Not Here
Join Date: Jul 2008
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Posts: 3,488
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if i remember correctly i think Jim Fulmer did a test and found there is no gain over like 45 psi of fuel pressure
__________________
2020 Ram 2500 4x4 Big Horn
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06-12-2010, 08:14 AM
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#9
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Name: 01PPUMP
Title: Too Much Time
Status: Not Here
Join Date: Aug 2006
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Posts: 1,164
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Quote:
Originally Posted by White Knight
I have to ask, why? Cavitation occurs from a sudden extreme pressure drop, and erosion is a result of flow. Since pressure has almost no effect on flow I do not see how either could be a problem.
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With the constant flow of fuel in and out of the pump it can cause erosion, I have seen alot of housing with erosion problems with stock fuel pressure(25-30psi)
__________________
Northeast Diesel Service
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06-12-2010, 09:57 AM
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#10
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Name: Kronic_187
Title: Mekanical injection junky
Status: Not Here
Join Date: Sep 2009
Location: British Columbia, Canada
Member`s Gallery
Posts: 1,343
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i'm running 1/2" dual feed, pump is moving 1gpm give or take (going by aeromotive flowchart) set @ 40ish (i say ish because the gauge on my regulator bounces around like a fish out of water) noticed a "stronger" sounding idle and noticebly stronger mid-top fueling bumping it from 20 to 40, but nothing really after that in my own "testing"
__________________
96:CCLB/4x4:NV5600/3250DD, 178/208, 7mmDV's, 5x.016, 155*, 2095, 4GSK, H11, 61.5/68/.9-88/96/1.32, Hammy VS/Manton PR, Dual 3.5" Pusher, 1/2"Feed-3/8Return,6" longarm, Junkyard Freespin Kit
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