Can a leaking fuel pump gasket cause vacuum leak?

I don't smell any fuel in the oil so hopefully it hasn't started to get into the pan. I'll have it changed within a week. So it won't be driven all week. I was told it could be an accelerator pump issue but I swapped out the carb two different times with another and the problem always remained. I may as well swap out the fuel pump regardless for reliability. I can't trust the fuel gauge either so never know how much gas is actually in the tank, I've had all kinds of problems out of these gauges that I've had redone. I get one working and then another goes out. Now the fuel gauge works seemingly correct sometimes and sometimes it will go all the way to full and I just had it redone, it took forever to get it back too. Luckily I had a spare one redone while having the temp gauge redone. Can you run any seafoam through this engine since it doesn't have a brake booster hose to use, what can I use to inject it? I'm sure the valves could use some cleaning since it's not been in service for over 10 years. It doesn't smoke. It definitely isn't a powerhouse stock. It sounds like a v8 but sure doesn't match it in power. Little 170 with 101hp and 155lbs-ft. No idea why whoever swapped the 225 for this 170, according to fender tag should be a 225. Block number comes up as a 1966 170. Still it's cool to cruise around in eventhough it's just a junk car that was on it's way to the crusher when I was able to save it.