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vortec fuel psi
Posted: Wed May 13, 2009 2:31 pm
by FJ JOHN
i need to know what psi a jeep 4.0 fuel pump runs at and if it can run a vortec 5.7? HELP
Posted: Wed May 13, 2009 7:50 pm
by Grumpy
So, this is just a hunch, but I'd say you best keep things matched. That 5.7 may want more pressure than the 4.0 did. Lurch or whoever can confirm if my guess is right...
Posted: Thu May 14, 2009 7:03 am
by tobyw
Jeep 4.0 fuel pump runs ~45psi, and the Vortec fuel system requires ~90psi if memory serves... And I believe that if the Vortec injectors do net get adequate pressure, they won't fire at all.
Posted: Thu May 14, 2009 7:31 am
by Lurch
My source at chevy says it should be between 55 and 60.