ZG 327 Fuel issue

[rlchurch]

My ZG 327 Zero turn mower is filling the cylinders full of fuel and as if the float is stuck. I removed carb and found no trash. Float does not appear to be sticking. Any ideas?

 

[100 td]

Replace the needle. It's probably a rubber tipped one, may have a ridge or split in it, have a good look under strong magnifier. One other thing, some have the pulse fuel pump (not sure about yours) and they work via crankcase pressure, if the diaphragm is torn the fuel goes into the crankcase.

 

[100 td]

If it has an electric pump, needle tip is critical.

 

[lugbolt]

What year is it? Newer I assume?

The newer ones have charcoal canisters, thanks to the EPA. They control fuel vapor emissions. They also have a set of check valves in the fuel lines and valves in the charcoal canisters. If any one of those valves fails, the fuel tanks will build pressure and fill the engine with fuel.

Conventional wisdom would say that the float valve is failed, but the float/carb is higher than the tanks and fuel level are (unless the tanks are full), so it can't gravity feed unless the tanks are completely full and parked facing uphill. Even then, fuel would have to get past the electric pump. It is not likely on these.

 

[rlchurch]

Thanks for the reply. I have not had time to do any investigation yet due to personnel issues but I will get back to you when I find something.