Fuel injection system questions

Discussion in 'General Automotive Questions' started by Clark, Aug 17, 2020.

  1. Clark

    Clark In Maximum Overdrive

    Messages:
    2,317
    Location:
    Brighton, Colorado
    This is 2002 Ford Ranger - not Ranchero. This truck has butchered up/patched up fuel lines which I need to replace.

    As I see it, Ford ran two nylon fuel lines from the tank to the fuel filter under the cab and then one nylon fuel line on to the engine compartment.

    Playing with a new fuel filter, I believe the two fuel lines from the tank connect to empty space on the inlet side of the fuel filter. A centered port on the inlet side of the filter is 5/16" diameter. The other port, offset to the side, is 3/8" diameter. I assume here that the 5/16" port is pressurized fuel from the pump and the 3/8" port is a return to the tank. The two nylon lines from the tank to the filter appear to be the same size although clearly the (missing) quick connectors would have been different sized.

    My real question is why did Ford do this?
    Why run a return line all the way to the fuel filter?
    Why a return line at all except to always have flow through the pump to prevent over heating?
    Why nylon fuel line? I see it as difficult to splice without heating - ugh!
     
  2. 65restomod

    65restomod In Overdrive BRONZE MEMBER

    Messages:
    785
    Location:
    Danville,VT left NJ forever
    In all the connectors are really simple to disconnect at the filter
    It's a matter of a squeeze and pull if they are still there
    they make repair kits for the lines
    The lines are made so there is one less chance to leak and for emission standards ( rubber will leach vapors )
    As the video states hot water


    I just found this it may help a lot
     
  3. Clark

    Clark In Maximum Overdrive

    Messages:
    2,317
    Location:
    Brighton, Colorado
    65restomod: Yes, but why did Ford do it this way?
     
  4. 65restomod

    65restomod In Overdrive BRONZE MEMBER

    Messages:
    785
    Location:
    Danville,VT left NJ forever
    In fuel systems with a return line, the fuel pump is continuously pumping gas through the fuel system at a much higher rate than is actually needed. This keeps gasoline in the fuel lines cool and flushes out any vapor bubbles that might form. This prevents vapor lock in your fuel system.
     
  5. handy_andy_cv64

    handy_andy_cv64 In Maximum Overdrive SILVER MEMBER

    Messages:
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    Location:
    Seguin, TX
    With the nylon line repair kits, I always heated the hose barb, instead of the line, making the line easier to handle, as the barb only heats what line it touches. Having said that, the nylon line is still a pain to handle when you repair it.
     
  6. Clark

    Clark In Maximum Overdrive

    Messages:
    2,317
    Location:
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    Thanks handy-any. I was wondering if heating the barb was an option.
     
  7. handy_andy_cv64

    handy_andy_cv64 In Maximum Overdrive SILVER MEMBER

    Messages:
    11,154
    Location:
    Seguin, TX
    I do so in boiling water, and handle the barb with needle-nose pliers. No sense in zorching my fingertips....:eek:
     

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