Fuel pressure on Carb motors

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#11 (permalink)

04-14-2010, 12:53 PM

Jerry Clayton Jerry Clayton is offline

CC Member

Join Date: Jul 2005

Location: Bartlett, Ill

Cobra Make, Engine: Everett-Morrison LS1

Posts: 2,448

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The inlet valves are NOT OPENED by fuel pressure!!!Gravity causes the float to drop, opening the needle seat. With larger diameter needle/seat assys, too much pressure will force them to leak overrunning the carb at the vents.
Also--too much volume/pressure can cause a carb to syphon fuel thru the vent at higher engine rpm.

I like to set carbs up with around 3 1/2 to 4 1/2 pressure and reasonable needle valve assy for the type of driving the car sees.

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