Fuel pressure on a carburetor v-6

[wogi]

What is the optimum fuel pressure for a V6 Mercury with wmv-22 carbs. Want to run a electric fuel pump with adjustable regulator. Looked in many manuals and can't find what fuel pressure should be. Thanks

[skialot2]

I believe 4-6 psi is correct for just about all carb motors. Any more and you can push the needle off the seat.

[tlwjkw]

ran 6 ta 7/8 on our BP's, oval ports (20's, 22's 46's) and 245's (wmv's with and without pumps) no problems but 90% of run time was with both feet on tha floor.. but agree with 4 ta 6 will work..

[wogi]

Thanks, I was thinking 4to6 psi, just wanted to know what others have been running. I was thinking that more than 7 may blow the needles off the seats like was stated by the replies. Thanks for the input

[tlwjkw]

have some friends run as low as 3lbs (bone stock 2.4's/2.5's) without problems.. so there's that!

[NZ Sidewinder]

I run WMV carbs at full pressure of a 7psi aero flow pump I think it's called.
Vane pump and horribly noisy.
It sits on the floor and pushes fuel up through a Sierra water separator under the cowl, then past a gauge and into the carbs.
At idle the pressure is over 7psi
It's a red pump

[john j 80 viking]

I run a red Holley fuel pump with the shims removed from the bypass valve. This gives me 4-5 psi without a regulator.

[rjdubiel]

I bought a cheapo MR Gasket dial fuel regulator and just adjusted it back till the needle seated and it stopped drooling out the carbs. Have read a lot of people run the carter fuel pumps, less money and only put out 4-5 psi.

RJ

[VkingMike]

I'd imagine unless your really spinning up the rpm's, the stock diaphragm pump works just fine

[Jim Speros]

No one has asked or mentioned oil pump. If your not pre mixing oil and using stock oil pump you need to set at 2 or 3 lbs. More can/will starve mix of oil.

[NZ Sidewinder]

If that dial reg or flow valve is a chrome thing with a large dial type knob, then it won't flow enough to run a 2.5 at 6500rpm.
Motor will be lean at 6000

[wogi]

All my stuff is premixed, don't trust oil injection