Small Engine Troubleshooting Problems? Ask a Mechanic Now.
I see what you have done, but have you ran a cylinder balance test? Loosen the spark plug wires, and with engine idling, remove one wire at a time, engine should continue to run. If engine dies when either wire is removed, the opposite cylinder is not firing. Major loss of power on the twin Briggs is usualy because it is running only on one cylinder.
OK< check it. and see what you have. Next test I would want to do, is removing the fuel solenoid in the carburetor and plug the hole and run unit with it out of the system.
No.leave it unplugged.
Try running a test line from the fule pump inlet, back into the fule tank filler opening, bypassing the tank out and lines to the fuel pump.
Fuel pump putting out good flow? If there is good flow to the carburetor, then problem will be in the carb.
Yes, lack of fuel when the horsepower is required!
Did you come up with a solution?