What Should Fuel Pressure Be Set At ??

[bigboi]

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?

[MrQuick]

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]

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]

I run at 7psi!

[johnsma22]

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]

9 psi is way too much

7 max

[Adam's 55 Chevy]

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]

Mine's @ 7 too, I would get a regulator and drop it down to 7.

[randrracing]

i run 6 psi with no trouble on the same carb as you . anymore isnt nessasary .

[recklessnova]

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]

6.5 - 7 psi is good. I've never heard of a needle/seat that could handle 11 psi!

~S~