Max fuel pressure to put on a p7100

Kronic_187

Kronic_187

Mekanical injection junky
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 ???
 
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.
 
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.
 
01PPUMP said:
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. :what:
 
if i remember correctly i think Jim Fulmer did a test and found there is no gain over like 45 psi of fuel pressure
 
White Knight said:
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. :what:
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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)
 
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"
 
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