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View Full Version : What Should Fuel Pressure Be Set At ??



bigboi
11-10-2007, 07:12 PM
I have a Big Block 396 with a Holley 650 Double Pumper Mechanical Secondaries. I am running a Holley Mechanical Fuel Pump straight to the carb. The pressure gauge on the fuel log reads 9psi. Is this too much pressure? Should I put a regulator on and set it around 6psi?

:screwy:

MrQuick
11-10-2007, 08:12 PM
Should be fine up to 11 psi. After that you'd risk over powering the needle pressure. 6-8 psi is where I keep mine

ProdigyCustoms
11-10-2007, 08:50 PM
I like 6 3/4 to 7 myself, As Vince mentioned your pushing the needle if you go much higher, and 7LBS should flow plenty even in drag racing situations.

class67
11-10-2007, 09:13 PM
I run at 7psi!

johnsma22
11-11-2007, 07:21 AM
Holley recommends no more than 5-7 psi of fuel pressure at idle for all of their 4150 series carburetors. They also require a minimum of 4 psi at WOT.

Shaker455
11-11-2007, 02:52 PM
9 psi is way too much

7 max

Adam's 55 Chevy
11-11-2007, 08:16 PM
The base setting for a Holley is 6.5psi. No way run it at 11 or even 9 or you will have fuel coming out the vent tubes. If the guage say this and your not having problems it's reading wrong.

whytry
12-06-2007, 03:30 PM
Mine's @ 7 too, I would get a regulator and drop it down to 7.

randrracing
01-20-2008, 07:44 PM
i run 6 psi with no trouble on the same carb as you . anymore isnt nessasary .

recklessnova
02-20-2008, 10:26 AM
do you rember what holley pump your running like the part number and also what type of gauge liquid filled or not?
i tend to try and not buy new parts like a regulator unless i need it my holley pump pushes 6 psi all the time on the street or the track no reg
josh

Scott Parkhurst
02-20-2008, 12:08 PM
6.5 - 7 psi is good. I've never heard of a needle/seat that could handle 11 psi!

~S~