Small Engines (Lawn Mowers, etc.): 5 hp BS engine on tiller, water in the fuel, check the flow

Question
Hi Michael,
I have an old tiller with a 5 hp B&S engine that has never failed me. It cranked about 2 months ago and now it won't. I changed the spark plug, put in fresh gas and changed the oil. Still nothing. No fire, nothing. Almost sounds like it's not getting gas. Any suggestions? It's time to get to work in the garden and spring is here!! thanks
/charlene

Answer
Hi Charlene,

You will need to determine if the problem is a lack of spark or a lack of fuel flow.  Right after it quits, remove the spark plug, reconnect the wire and lay it against the engine head.  Pull the engine over and watch for spark at the plug's electrode.

If good, then try to start it while squirting fuel or starting fluid into the carb intake.  If it starts and you can keep it running by adding fuel, then the carb most likely has dirt, debris or gummed fuel inside.  First, check the flow from the fuel line at the carb's inlet. Also check for water in the fuel.    
If all is good, you will then need to remove the carb, disassemble it, clean all the small internal openings and blow it out with compressed air.   Probe each and every hole with a small wire.   Adding a carb rebuild kit wouldn't hurt either.  

Let me know how you make out.
Michael