forddieseldoctor Posted December 9, 2021 Share Posted December 9, 2021 I have a guy who wants me to install an aftermarket inline fuel heater on his 17 F450. It needs to go in the line that goes into the filter from the tank. I cannot find a description of which line is which between the pump and filter and I would rather not unplug them all and power up the pump to see which one sprays. Can anyone help me out with this? Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted December 9, 2021 Share Posted December 9, 2021 The fuel return between the fuel filter water separator and the tank is in the middle of the three facing sideways. This is described in the WSM in the fuel filter replacement procedure. Quote Link to comment Share on other sites More sharing options...
forddieseldoctor Posted December 9, 2021 Author Share Posted December 9, 2021 I saw that. I need the inlet to the filter from the pump. I believe that one is return from motor after it goes through the filter housing and heads back to the tank. Quote Link to comment Share on other sites More sharing options...
forddieseldoctor Posted December 11, 2021 Author Share Posted December 11, 2021 We pulled the tank out of the truck and did some investigating on how the fuel flows through the lines and the filter. I’m gonna refer to the ports on the fuel conditioning module by number from top to bottom in my picture with #4 being the port that is turned 90 degrees from the rest of them. #1. The filter housing is under suction just like the previous body style’s filter. #2. The line that the book calls the “return line” is actually the line that draws fuel from the tank into the filter on port #2. #3. The fuel flows through the filter assembly , out port #1 and then goes into the fuel pump and gets pressurized. There is actually an arrow on the filter housing to indicate direction of flow. #4. Fuel leaves the pump and goes to the secondary filter and the hpfp. #5. Fuel returns to the fuel conditioning module on port #4 and then if the fuel is warm enough back to the tank. Otherwise if it’s too cold it gets sent right back through the filter to the pump and back to the motor. 2 Quote Link to comment Share on other sites More sharing options...
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