Small Engines (Lawn Mowers, etc.): Briggs@stratton not getting gas, briggs stratton engine, briggs stratton

Question
QUESTION: I have briggs&stratton engine series 402700-402799.I had a problem with it starting.rebuilt and cleaned old carb.but no luck.I bought a new carb with fuel pump.it started right off.Iwent to start it again and starter went out i just put new starter on.its back to square one.if i put fuel in carb.it starts till gas is burned.but no fuel to carb.this happened before and i replaced the breather.this was about 2 years ago.I forgot how to test the vacuum.i have a mitey mite vacuum deal but forgot how to do it.I changed fuel filter and cleaned tank.any help would be appreciated.I'm about to give up on this old mower.

ANSWER: I wonder how long it has been between times you start it. If you are leaving it sit for extended periods you may need to clean the carburetor out. The jets in the carburetor can get stopped up quickly and easily with ethanol/gas. Try using some SEA FOAM or DEEP CREEP next time you attempt to clean it.

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QUESTION: I will clean the carburator but i don't think gas is being pumped into the carburator.It has a new carb &fuel pump and fresh gas.how much vacuum is needed to keep it running?

Answer
It is not a great amount of vacuum that causes this unit to pump fuel. You would need a serious engine problem to keep it from pumping fuel. You should check your vacuum line and make sure it has no cracks or leaks of any kind. I would try manually choking the carburetor and see if you get any fuel then.