Reply to "fuel pressure"

joules"Racing is Life, anything before or after is just waiting" - Steve McQueen

Yes 7 psi for a carb, but it's not so much presuure as the regulator will maintain that once set, it's lbs/hr the fuel pump is rated for.

Based on rule of thumb where Brake Specific Fuel Consumption (BSFC) is about 0.4 for a naturally aspirated engine, your 425HP will require about 170 lbs/hr fuel. A pump manufacturer should provide a pump curve, so just select a pump that can deliver min 170 lbs/hr @ 7 psi. Oversizing to some degree is not an issue as the excess will return to the fuel tank via the regulator return.

Electric pumps are a) not good suction pumps and b) don't tolerate running dry, so should be fed from the bottom of the tank (or in tank) to remain permanently 'primed'.

Julian

5/15/1010:43 PM

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