I have a mower with a Briggs & Stratton Quattro 4hp with the pulsa prime carburator. It started running very rough, chugging and barely ran fast enough to keep running. After some research I cleaned out the fuel tank, changed the plug and replaced the diaphram. It now runs great but the only way I can start it is to manually prime it by removing the air filter and pouring tiny bits of fuel in the carb. I can push the prime bulb all day and still no fuel will come out.
Before I did the work it was priming just fine and I have not dismantled the carb or primer bulb itself so not sure what went wrong here. It will still start great if its warmed up, this problem is only after the mower has been sitting a few days.
Any help or suggestions would be greatly appreciated.