Quote:
Originally Posted by steve25
Do you realize that when the electric pump is not running that the pump is then a great restriction and that if the fuel is hot enough at that point that the difference in pressure can make for vapor lock taking place right there at the pump?
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That's an old wive's tale. I tested mine before installing. Free flow is not restricted. When the pump is off, the rotors will freewheel and rotate to the point where the fuel flows around the vanes.. Fuel flow moves the vanes away from the inlet and outlet ports and flows through the unrestricted path. It is no different than a surge tank with a plenum inside. It naturally assumes this position when fuel is flowing and the electric pump is not running. The suction from the mechanical pump is sufficient to make the fuel flow through the pump on a dry start too.
