Old Tecumseh engine problem has me baffled
Working on this old Tecumseh engine with a carb that still has the adjustable main jet. Changed out all the fuel and I ran it for 5 minutes to warm up the oil, changed oil, ran it some more to make sure it started easy and turned it back to the customer. Customer uses up the fuel in the tank and it stalls. Adds his own fuel and it will start, but only run for 1 second.
I figure dirt or water, so I drain the tank and bowl, and the same thing. I drain the tank, blow it dry, change the fuel line, disassemble and clean the carb, check the float, replace the needle and seat. Go to start it and same thing.
Check the governor, change the spark plug, remove the air cleaner, everything is OK. Go to start it, same thing.
When it starts, it starts easily, revs for one second and shuts down, like it's out of fuel. Loosen the jet, and fuel pours out. Jet was tried at all positions of open.
Only thing left is the coil. What do you think?