Fuel filter half full?

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  • starback
    Low Range
    • May 2012
    • 2
    #1

    Fuel filter half full?

    Greetings everyone!

    I'm working through some fuel line issues on a 69 IIA SWB and have swapped the existing fuel filter, a metal bodied AC-DELCO GF61, with a clear plastic equivalent to find the fuel inside the fuel filter remains only half full (the filter is positioned horizontally).

    It runs fine (knocking on wood), but I'm thinking that the filter should be full. Its a mechanical fuel pump. I've tightened the connections, removed and cleared the intake at the tank and cleaned the bowl. Still only half full no matter what i've done.

    Do I keep at it because there is a air leak or let this go because it is what it is?

    Also, I've read a suggestion to place another filter after the pump. Is this a good recommendation and would it be the same type as used before the pump?

    Thanks in advance! These forums have been a great help. Thanks to the hosts and posters!
    Tags: fuel filter, iia
    • SafeAirOne
      Overdrive
      • Apr 2008
      • 3435
      #2
      I don't use one but from what I've seen of other folks that use them, this is pretty normal. I don't think I've seen one full.
      --Mark

      1973 SIII 109 RHD 2.5NA Diesel

      0-54mph in just under 11.5 minutes
      (9.7 minutes now that she's a 3-door).

        Comment

        • I Leak Oil
          Overdrive
          • Nov 2006
          • 1796
          #3
          No, it won't be full. Sometimes at high revs it may even appear empty!
          Jason
          "Clubs are for Chumps" Club president

            Comment

            • stomper
              5th Gear
              • Apr 2007
              • 889
              #4
              The only time I have seen one full is if you turn the engine off, and manually pump the fuel lever to fill it. It will go back to half full once you start the engine though.
              Bad gas mileage gets you to some of the greatest places on earth.

                Comment

                • starback
                  Low Range
                  • May 2012
                  • 2
                  #5
                  Awesome! Thanks so much for the quick response.
                  Peter

                    Comment

                    • jac04
                      Overdrive
                      • Feb 2007
                      • 1884
                      #6
                      Originally posted by starback
                      Its a mechanical fuel pump. ... Also, I've read a suggestion to place another filter after the pump. Is this a good recommendation and would it be the same type as used before the pump?
                      Typically, mechanical fuel pumps don't like any restriction on the inlet. The original pump used a sediment bowl, which isn't very restrictive at all.
                      It is recommended to run a fuel filter on the discharge side of the fuel pump. Even though some carbs have an internal filter, you are better off catching anything in a separate filter that is easy to change. I highly recommend that you don't use a clear plastic filter, and you continue to use the metal-bodied GF61 (or equivalent metal filter). I have had the plastic filters fail, and they don't seem to hold up well to the hot underhood conditions.

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