I'm working on my cousins mower with a B&S 31S8770001 G1 code 15111820. He was mowing and it shutoff and would not crank back up. I checked the spark at the plug and it has good spark. Checked the compression and it was around 80. Checked the valve adjustments and they are around .005. So I don't think I have a valve problem. I had a carburetor off my daughters JD110 with the basically same engine and used the Nikki carb. It cranked up ok. So I took the original carb apart and cleaned with carb cleaner, put back together and it cranked fine. I cut grass for about 20 minutes fine, then started acting up blowing black smoke like it was flooding out. So I just ordered another carb and replaced today. Cut grass for about an hour or so with no problems. I shut it down and then it would not crank. Pulled in to shop, pulled plug and checked sparkplug for spark and it was fine but noticed it was blowing an excessive gas spray out the plug hole. I noticed the fuel filter was full of gas, not partially full like normal. Disconnected the fuel line from Carb and it cranked up and emptied the bowl of gas. I connected the fuel line back up. It ran for a few minutes and the started sputtering again before shutting down. Now I figure I either still have carb problem with float not stopping fuel from filling the bowl too full, maybe a fuel pump problem pumping too hard. Can any0ne tell me about how much vacuum I should have at the pump, what should the fuel pump pressure be? Or any other good words of wisdom.
Thanks.
Thanks.