Small Engine Troubleshooting Problems? Ask a Mechanic Now.
What engine is this? Purple wire? Is it the charging wire from under the flywheel?
Blows as soon as key is turned on? Or when key is turned to start?
When key is turned on, check the voltage regulator, and the fuel solenoid in carburetor.
Just unplug the regulator to test. If fuse doesn't blow. you know it is bad.
Same with fuel solenoid, if it has one.