Kohler KT735 keeps flooding

[Craftsman Garage]

I've got a Kohler KT735 V-Twin engine here, and it just keeps flooding. The first and only planned repair was to replace the head gasket, it had blown and I always wondered what that hissing sound was when it was cranking before I found it. It was blowing to the outside, if that matters. Anyway, after I replaced that and assembled everything, the electric fuel pump system kept flooding the carburetor. I sorta expected that, since it is electric instead of vacuum but it had worked for months before this repair. I converted it back to a vacuum system, just to eliminate that as a possible issue, and it is STILL flooding. I will crank it and crank it and no starting, but only when I turn the key to off will it flood the carburetor and intake with fuel. The fuel pump works, and it floods like this with both a aftermarket as well as a OEM carb. The fuel solenoid DOES work and you can hear it click with the key at RUN. Any ideas why this could be happening? This is on a 2014 Craftsman T7400, by the way. Thanks guys.

 

[Auto Doc's]

You need a new carburetor needle and use only the vacuum pulse pump. An electric pump makes well over 5 PSI pressure which is way too much for the small fuel needle to handle for very long.

 

[slomo]

You need to pressure test the carb needle/seat. Should hold 7psi for 30+ minutes. Many a video on youtube about this testing procedure.

Auto Doc is right about your pump. Possible over pressure blowing the needle off the seat. Typically most carbs with pumps, 3.5 psi is plenty of pressure.

I too would ditch some aftermarket electric pump and put it back as it came new.

 

[StarTech]

This is the question about the electric fuel pump. What is the make and model? I install electric fuel pumps on some Kohler, Briggs, and Kawasaki time to time but needs to be a low pressure model...Usually 4 psi or less.

As for the flooding problem I need the spec number to see which is used as if a Walbro it may need a new needle seat as there has been problems with those.

 

[Craftsman Garage]

The electric fuel pump I had installed was one for a Kawasaki Mule 2510, which has a carbureted Kawasaki V-Twin. It is advertised as only pushing 1-2 PSi. Here is a description from the listing

• Electric Fuel Pump Input Voltage:12V, Pressure:1-2psi, Flow Rate: 60lph, Current:1.0A

I figured it would work since it worked on a similar both carbureted engine, and it did for a few months. Tried a new oem as well as aftermarket carburetor, inspected before install, and the float needle and seat looked perfect.

 

[Craftsman Garage]

This is the question about the electric fuel pump. What is the make and model? I install electric fuel pumps on some Kohler, Briggs, and Kawasaki time to time but needs to be a low pressure model...Usually 4 psi or less.

As for the flooding problem I need the spec number to see which is used as if a Walbro it may need a new needle seat as there has been problems with those.

I can get you that Walbro model number later today