Dan,

        I run a Mustang (aftermarket) in tank pump with a 40 lb rating. I control that with a bypass regulator that is "Boost-Referenced". It increases the pressure to the carb as the boost pressure increases. The object being to keep the carb fuel pressure about 6 lbs. more than what the blower is delivering. I do this because I Don't have a real Blower fuel pump. Those pumps are rare and expensive. Clear as mud?

Frank/Rebop

Bristol, In ( by Elkhart) 

John,

those were my thoughts, but having never dealt with any engine under boost, this is a new ball game to me.

I did notice that the original paxton mcculloch VS57 instructions seemed to have the electric fuel pump mounted down the line from the mechanical pump (between the mp and carb)? Do you think I should go ahead and mount the electric fuel pump before the mechanical pump?

All of this may be moot considering there is no load, but I would like to go through the mechanics of getting everything as it should be if installed in a vehicle and put under load. There may be some dyno time later on...once I get that cam installed.

I have already tested the teapot (with no boost) and I was very pleased. Out of my "box" the carb performed very well. I will have to make some final adjustments when it gets under boost and fully warm, but after my rebuild and all of the blow through mods, it started, idled, and went to WOT very quickly with no hesitations.

And then, there is always the possibility of being able to talk my father-in-law into letting me install it into his 55 Club Sedan later this winter after the car show season is over. The 292 I put in that vehicle runs so well naturally aspirated, it may be hard to convince him!

Daniel Jessup

Lancaster, California

aka "The Hot Rod Reverend"
check out the 1955 Ford Fairlane build at www.hotrodreverend.com

Dan:

Without an electric pump, your mechanical pump has to "suck" the fuel from the tank, then pressurize it to the level required to fill the carb.  With the electric pump added it will charge the mechanical pump with pressure, negating the "suck" requirement.  The boost reverenced mechanical pump will still provide the needed pressure, so the electric pump doesn't need to supply the total pressure.  On your test stand engine, you may not even need an electric pump, the mechanical pump may be enough since it doesn't have to deal with a long fuel line and the inertia of the car accelerating.

John - "The Hoosier Hurricane"

Hate to awaken an old post, but I was wondering what range of psi the electric fuel pumps are that you fellas run on those supercharged engines (that have a good mechanical fuel pump that has been boost referenced too). The ones I find at parts stores are only 4-7 psi. I know to run 5 psi boost you need at least 8 psi fuel pressure right?

dan

Daniel Jessup

Lancaster, California

aka "The Hot Rod Reverend"
check out the 1955 Ford Fairlane build at www.hotrodreverend.com

Thanks Chuck. I know that Summit Racing sells the 427 FE pumps. Have a GREAT Thanksgiving!

Rono

  Ron Lane,  Meridian, ID

The pump I use is not much bigger than an inline fuel filter, maybe 2" diameter. It's a standard parts house pump. I don't recall who made it at this time but is was a Stewart Warner or one of those old standby companies. I use the HiPo 427 FE style pump that puts out around 6lbs. It is also boost referenced by applying boost to the top of the fuel pump diaphragm. This setup is good for hard runs up to about 65-70mph but for a full 1/4 run I need the electric pump. Otherwise I'll have fuel starvation about 1/2 way through 2d gear. I haven't had any fuel problems since I added it. Chuck 

Y's guys rule!
Looking for McCullouch VS57 brackets and parts. Also looking for 28 Chrysler series 72 parts. And early Hemi parts.

MoonShadow, 292 w/McCulloch, 28 Chrysler Roadster, 354 Hemi)
Manchester, New Hampshire

Chuck;

I run a Holly Red Top electric fuel pump in my Customline now. Is this the type of pump you had set-up with a switch for hard runs? Also, what ype of pressure does your mechanical pump put out? I'm still trying t figure out the right type of pump (single or dual diaphram). Do you use one of those overflow fuel filters that sends extra fuel back to the tank? I know...ls of questions

Thanks,

Rono.

  Ron Lane,  Meridian, ID

You are right John! It was a 427 HiPo pump from Holley. Never did cure it, replaced it! Now I run an inline electric pump with a switch on the dash. I turn it on only when making a "hard" run. Eliminated any sign of starvation. Chuck

Y's guys rule!
Looking for McCullouch VS57 brackets and parts. Also looking for 28 Chrysler series 72 parts. And early Hemi parts.

MoonShadow, 292 w/McCulloch, 28 Chrysler Roadster, 354 Hemi)
Manchester, New Hampshire

Rono:

One other thing.  I have found two rebuilt fuel pumps with no diaphragm stem seal.  Without that seal, it is impossible to pressurize the back side of the diaphragm.  So now I always check my pressurized pumps with shop air and a regulator to make sure they can contain at least blower boost pressure.  Moonshadow had one a few years ago at Columbus that couldn't be pressurized, caused him all kinds of headaches.  I believe it was an FE pump.  Chuck?

John - "The Hoosier Hurricane"

Ted;

THANKS!! A picture (or 2 or 3) is worth a thousand words. Thanks also for the fuel pump recommendations.

Rono.

  Ron Lane,  Meridian, ID