I put a new fuel pump from Chevy Duty on my truck last fall. It's the one with the vacuum booster and fuel filter. It was OK when I put it on, but it has recently taken to leaking oil out the small rectangular vacuum intake hole. I take it the oil seal has gone south.

Does anyone have a fix? The shop manual speaks about disassembling and rebuilding. I don't know if there are still kits available for these. Should I just get another fuel pump and forget about the vacuum booster feature?