Can a leaking fuel pump gasket cause vacuum leak?

17-18 at idle doesn't sound all that good, could be as high as 21-22. have you adjusted your valves yet? if it sputters on a WOT from a stop, your accelerator pump is not up to par, check the linkage and also your timing. make sure your pot holds a vacuum and the plate is moving. pop cap and suck on advance hose: observe breaker plate rotating, now use your tongue to plug vacuum hose and see if plate holds. easier done than said. My 1920 had a strange hole in the side that spit fuel when the accelerator pump went bad. strange design.