Quote:
Originally Posted by NeighborsComplaint
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.
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Just because it is able to pull fuel through it doesn't mean that it's not a restriction. Doesn't take much pressure drop to make high vapor pressure fluid boil.