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1998 and up Rangers got a Returnless fuel system, they run at 65psi pressure, so 1997 was the last year that had an FPR, 35psi pressure, FPR controlled fuel flowing back to the gas tank on the fuel Return line.
From 1998 computer calculates fuel use and cycles the fuel pump power accordingly.
There is an over pressure valve on the fuel line in the gas tank with the pump, but it isn't technically an FPR.
And as on all fuel pumps there is a Check Valve in the pump that holds pressure in the system when pump is off
Returnless does have a Pulse Damper on the fuel rail, when using pressures above 50psi the opening and closing of the fuel injectors can create pressure waves in the fuel rail, these can build up causing fuel flow issues out of injectors as the waves pass by.
Pulse Damper absorbs the waves to stop them from building up.
It is at the end of the rail and will have a vacuum hose attached, this hose is a safety feature not part of Pulse damper operation, if Damper were to leak fuel would be sucked into engine not dripped onto hot exhaust or engine parts
Last edited by RonD; 07-31-2016 at 12:42 PM.