I am at my wits end with this stupid thing. Its only 3 1/2 HP so maybe its not really worth much more effort. So its a no name (actually a worn off name label) from Sams Club with a Tecumseh horizontal shaft engine maybe 6 - 8 years old. The problem is in the carb I am sure. Runs for a little bit on starter fluid. But help me understand how this cheap engine works when I do not see any choke, only a primer bulb. I look in the intake and do not see any automatic choke valve closed. The throttle is FAST to STOP. No choke at the top, above FAST. A secondary question, as long as the primer bulb is not leaking is it working? There is nothing behind the primer bulb that could fail and I cannot see?