2002 Ranger fuel lines

[mikkelstuff]

I'm would like to understand the fuel line system in my 2002 Ranger XLT 4WD pickup. My pdf manual does not address this.

There are two lines into the fuel filter and one out. Blowing into a new filter, it appears that the centered input line connects through the filter to the centered outflow line. I'm guessing the more perimeter located line on the input end of the filter is actually an overpressure return line. Any chance this is correct?

 

[sheep herder]

Correct.

By the way, Dirtman is sexually attracted to dinosaurs.

 

[mikkelstuff]

Ok. Any idea at what pressure the relief is supposed to open?

 

[Dirtman]

Its not really a pressure relief, the pump has a built in pressure regulator set to 65psi. The system cant always use the VOLUME of fuel the pump is putting out. For example, it uses less fuel at idle than at full throttle but the PRESSURE is always the same no matter what. The bypass at the filter simply allows the unused VOLUME of fuel back to the tank, it doesn't regulate the the pressure.

 

[mikkelstuff]

Ok, not a pressure regulator but an alternative fuel return. Still, I'm thinking, the bypass line must be smaller or restricted as compared with the line from the pump so the pump can maintain fuel pressure.

I understand the need for the bypass but why that this bypass should have been built into the fuel filter seems very strange to me. I may cut apart a spare filter to see just how this was built.