| frank ziherle |
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| #1 |
hello howard,thanks for the recommendation of pn5011 reg to be used w/edelbrock victor mech. pump on my sbc 355.i thought i read where you said to run a deadhead system on mechanical systems like mine .the 5011 has a return- -do i use it and the idle bleed or am i hopelessly confused? thanks! frank z |
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| Howard |
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| #2 |
The terminology on regulators can be a bit confusing.
A "return style" regulator is simply a pressure relief valve. They install on the back side of the fuel log. They open at the set pressure and return the quantity of fuel necessary to maintain the set pressure. This style regulator is very simple and works well with "dumb" pumps.....pumps that are not able to adjust their output for the fuel the engine is using.
A "dead head style" regulator is designed to work with variable displacement pumps..."smart" pumps that pump only the quantity of fuel required to maintain the set fuel pressue. The Race Pump and the older style diaphgram pumps are variable displacement "smart" pumps.
The down side to using a variable displacement pump and a dead head regulator is the fuel pumped from the tank to the engine compartment stays there until the engine consumes it. Today's pump gas has a lower "vapor" (boiling) point and the typical street car has a higher engine compartment temperature. These factors combine to cause vapor lock in a street driven car with a varibable displacement pump and a dead head regulator.
The Race Pumps idle bleed/return regulators are simply dead head regulators with a constant .070" return to the tank off the low pressure side. This keeps the fuel in the engine compartment cooler and prevents vapor lock.
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