Fuel pressure must be limited to less than 7 psi without hurting flow.
Normal low pressure early CFi Mustang GT automatic fuel pumps are a good source.
If you already have a fuel pump, then you'll have to be carefull to ensure it scavenges out the last ounce of gas.
Holley's latest in tank fuel pump I really like, but its 450 ping
http://www.hotrod.com/articles/holle...-pump-install/
Some of the early Ford Mustang 5.0 M code CFi autos had a low pressure pump intank, and a higher pressure pump outside, and its the only stock system I like....all others are unable to scavenge down reliably, especially if replaced with an aftermarket pump. Then there's the enertial fuel pump cut out, and the return line and tank vent. There is a lot in making a safe electric fuel pump system.
I like the pre EFI carb Ferrai system, high volume, low pressure (4.2 psi). Safe as flamethrower in a fountain. I'm sure its a lot less safer, but I just love the
On a carb instillation, you need a return line to lower the pressure, not regulate the flow. If you have an EFI style Mallory 250 fuel pump, you'd run a fuel return as big as your fuel supply line to your carb. If its less than the gallons per hour specs on a Mallory 250, you'd then look at the a line smaller, the same as the vapour line from the tank. It would have to be steel or rated rubber, and deposit fuel below the fuel filler, preferably the way it does on a factory instillation.
In a full accelleration launch, any return line fuel has to go into the tank in a manner that doesn't create aerated gasoline at the pickup point to the fuel pump. In an accident, there should be a inertial cut out, and an oil pressure cut out to any electric pump fuel flow.
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