Petter S Type - fuel leak from fuel injection pump

Discussion in 'Discussion' started by David Lacey, Apr 1, 2020.

  1. David Lacey

    David Lacey New Member

    Petter S Type 12HP 1923 - when running I get a small drip of fuel from the bottom of the fuel pump (circled) it drops onto the governor cam/roller beneath, washing away any lubrication and then drops to the floor.

    It's not a huge leak by any stretch of the imagination, but it just annoys me on what is otherwise a perfect engine.

    Could anyone enlighten/advise me as to my best course of action please? Many thanks!

    Attached Files:

  2. David Lacey

    David Lacey New Member

    Update to this thread - I had two small grooves very carefully machined into the bore of the fuel pump and a very small O ring installed into each groove; on both 12HP engines, this has resulted in a dry fuel pump plunger and no fuel washing the oil from the governor cam. Very pleased.

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