have a question about the fuel pumps capability

[hron13]

just wondering if with my new 4 barrel swap i could keep the stock fuel pump, or if im going to need to go electric?

any help would be appreciated, the motor is an L31 with a 390 holley and a cam.

[gnosez]

try www.hybridz.org

[mayitin]

you can try it by just accelerating hard and see if it back fires. But I think the V8 will need more gas. Gnosez gave you a link, those guy have done so many swaps and have a lot of info.

[sblake01]

mayitin, where did you get "V8" from? Anyway, the following is very elementary research that you could have easily done yourself. According to the factory service manual, a stock 240Z fuel pump puts out 3.41 to 4.27 psi. According to a file on the Holley website, a 390 requires 5-7.5 psi. You'll need a fuel pump with more output than the stock one.

Edited January 18, 2010 by sblake01

[sblake01]

the motor is an L31 with a 390 holley and a cam.

Tell us more about the engine. Are you saying it's a stroker? L28D crankshaft, etc.?