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fuel pressure

Posted By: maxie

fuel pressure - 08/04/14 02:30 AM

Got the fuel pressure gage installed on the demon and the car is running a Edelbrock run quiet electric pump with a built in regulator. It had 3 psi at the carbs and we moved it up to 6.5. What are most of you running?
Posted By: MR_P_BODY

Re: fuel pressure - 08/04/14 02:40 AM

If you have a KNOWN calibrated gauge a Holley will
take 7.5 PSI.. it MIGHT go 8 PSI without blowing the
needle off the seat... I run 7-7.5 psi... the AFB
style take a lot less
Posted By: Ari440

Re: fuel pressure - 08/04/14 02:41 AM

6-7 pounds
Posted By: Cab_Burge

Re: fuel pressure - 08/04/14 03:38 AM

With the smaller volume pumps I push the pressure up to as much as the needles wil take to blow them off and then lower the prssure down 1/2 to 1.0 lbs On the bigger volume pumps I'm running 5.5 to 7.0 lbs, they both work
Posted By: maxie

Re: fuel pressure - 08/04/14 04:25 AM

I used to run the mechanical and the electric pump, but took the mechanical off. I was surprised to see the pressure that low. I am still running the 3/8 line on the car.
Posted By: dvw

Re: fuel pressure - 08/04/14 04:27 AM

Eddys will flood at much over 6.5PSI. I run 6.5 no issue with starvation.
Doug
Posted By: maxie

Re: fuel pressure - 08/04/14 04:46 AM

It has holley 4160 770 carbs on it
Posted By: maxie

Re: fuel pressure - 08/04/14 04:54 AM

Forgot I also got the custom made covers for it also.

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Posted By: MR_P_BODY

Re: fuel pressure - 08/04/14 04:56 AM

Quote:

It has holley 4160 770 carbs on it



7 psi is realistic with a good gauge.. also you MIGHT
want to increase the needle/seat more than the .110
if you need it
Posted By: MR_P_BODY

Re: fuel pressure - 08/04/14 05:03 AM

Quote:

Forgot I also got the custom made covers for it also.



Your covers can be screwing up the inlet air.. do you
have a radiused inlet under them and what is the mesh..
it might be too small for good flow
Posted By: maxie

Re: fuel pressure - 08/05/14 02:09 AM

It has the A and A velocity stacks on it that are repops of the original ones. The mesh is a cover made for velocity stacks or air filters, a pre filter if you will. I just have them on there for street duty. They were custom made to the dimensions I needed.
Posted By: gregsdart

Re: fuel pressure - 08/05/14 03:53 AM

With four needle and seats feeding the motor, the pressure can be a lot lower. It shouldn't take over 4 psi as long as the regulator is by the carbs. I had a system many years ago that dropped to 3 psi with two 800 Holleys feeding about 600 hp, never went lean.
Posted By: 383man

Re: fuel pressure - 08/05/14 04:29 AM

I set mine at 6 psi with an 850 DP. Ron
Posted By: 440W8 Duster

Re: fuel pressure - 08/05/14 03:03 PM

Mine is set at 5-5.5 lbs as per Bob Book and I have a Magna Fuel 500.

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