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Technical 1953 Mercury dual action fuel pump problem

Discussion in 'The Hokey Ass Message Board' started by d2_willys, Feb 11, 2021.

  1. d2_willys
    Joined: Sep 8, 2007
    Posts: 4,148

    d2_willys
    Member
    from Kansas

    I have a 1953 Mercury with original flathead engine. I am having trouble with the fuel pump. I have tried three different fuel pumps and the same thing happens:
    After installing the fuel pump (and filling the fuel pump filter bowl), I hit the starter button and only one spurt of fuel comes out, then nothing. I take the top portion of fuel pump off, only to find the diaphragm rod is not connected to the cam lever assembly. The vacuum portion is still connected.
    When installing the fuel pump, I leave the existing pump push rod cover on, then manipulate the pump into place.
    Is there something I am not doing correctly, or what would cause this to happen?
    Thanks :(
     
  2. d2_willys
    Joined: Sep 8, 2007
    Posts: 4,148

    d2_willys
    Member
    from Kansas

    Think I will pose this question to people who rebuild fuel pumps, such as then and now, etc.
    In the meantime, I will look over one of the spares I have to see if I can diagnose why the problem exists.
     
  3. Dangerousdan
    Joined: Apr 12, 2018
    Posts: 203

    Dangerousdan
    Member
    from Arizona

    Just a thought? I have seen the rod that operates the pump some times becomes short due to wear. My $0.02
     
    Lost in the Fifties likes this.
  4. Lost in the Fifties
    Joined: Feb 25, 2010
    Posts: 435

    Lost in the Fifties
    Member

    Dangerous Dan is right! We used to build up pump rod by welding pump end, filing and polishing and replacing. It was quite common practice. Today, you just buy a new one.
     

  5. d2_willys
    Joined: Sep 8, 2007
    Posts: 4,148

    d2_willys
    Member
    from Kansas

    Guys, the pump rod wear is certainly possible, but 3 pumps having the same issue? But I will check my spares to see what the "hook" end looks like. I am thinking that the round end of the rod (takes in the camshaft push rod) might have something to do with the problem.
     
  6. Let us know...........
     
  7. hotrodjack33
    Joined: Aug 19, 2019
    Posts: 2,081

    hotrodjack33
    ALLIANCE MEMBER

    @Lost in the Fifties nailed it. If all 3 pumps won't work, it's definatly the fuel pump rod has worn out (too short)...a very common problem on Flatheads. As mentioned, a spot of weld on the end of the rod will add length to it...an old time trick.
     
    dirty old man likes this.

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