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Author Topic:   Fuel lines
34Racing
Member
posted July 20, 2004 12:20 PM
if you are running a quadrajet, 5-6 psi
is ideal. you don't want any more than
6 psi. i have used a rubber hose system
from fuel cell to carb for 4 years and never
had any trouble. i use a stock fuel pump too.


BrianW
Member
posted July 20, 2004 03:09 PM
This is easy - pressure and volume are directly related - Pressure measures the "backup" of the fuel in the line waiting to get into the carb - volume is how fast you can deliver the fuel flow. Now - if you're not delivering enough volume for demand then your "backup" is going to lessen thus the pressure drops - if the pressure is consistant all the way through the RPM / load range then you've got enough volume for your current demand - OR - you have a restriction between the pump and the delivery mechanism (carb) - could be that your needle/seat doesn't flow enough fuel to keep the bowl filled or your jets can't flow enough fuel to keep the engine "fed" in it's healthy A/F range. Or you've got a blockage in the carb somewhere restricting fuel flow.


34Racing
Member
posted July 20, 2004 05:01 PM
what kinda compression are we talking about here and what octain fuel also any chance of a vacume leak causing the leaned out condition.if you were running outfront and the motor wasn't cutting out on youit'snot a starvation problem.i had that problem atthe beginning of the year plugs real lean and blubbered big time at the top end when the bowl ran dry was just float level that fixed it but in youyr case i'd check for a vac leak with a can of wd 40 while the car is running and spray anywhere youcould get aleak and see if it revs up thats your leak if it does


34Racing
Member
posted July 21, 2004 05:40 AM
I fought a starvation problem for 4 weeks, motor would fall on its face at the end of straight. 1/2 fuel line stock pump, was getting 2 1/2 psi at end of straight and was causing lean condition, switched to a high volume standard pressure holley pump and it fixed my problem. 9 psi at idle and holds 5 to 6 all night.



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