vortec fuel psi

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FJ JOHN
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vortec fuel psi

Postby FJ JOHN » Wed May 13, 2009 2:31 pm

i need to know what psi a jeep 4.0 fuel pump runs at and if it can run a vortec 5.7? HELP :?: :idea:
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Grumpy
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Postby Grumpy » Wed May 13, 2009 7:50 pm

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...
Dave
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tobyw
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Postby tobyw » Thu May 14, 2009 7:03 am

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.
Yep, I've wheeled one of those, too...
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Lurch
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Postby Lurch » Thu May 14, 2009 7:31 am

My source at chevy says it should be between 55 and 60.
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