I finally picked up an Autolite 1100 for my wifes 63 (thanks Dave) and rebuilt it and have run into the same issue multiple times now. The pump diaphragm for the anti-stall dashpot will not seal. At first it was seeping which screwed up the diaphragm (or it was a bad one) so I replaced it and now it shoots a good 3 foot stream of fuel out the top right under the pivot point for the pump arm. Does anyone have any advice on what might be causing this issue and how it can be fixed?

Thanks,
Kevin