I bought a AC mechanical fuel pump mod ACX 10 (Canadian), that
fits my 1931 3L. I think however the rocker arm is the wrong type
as the pump does not work if fitted to the engine. The fork inside
the house moves only 5 mm. I heard that a fuel pump, model A
should be the right one..

Does anyone have drawings of or a spare rocker arm to be fitted
to my pump?

Thanks for your assistance