Hey Kevin ,
It's a GP30K its stamped on the plate & serial number AT13L30849
I believe it's a Mitsubishi engine most parts have the Mitsubishi logo on them.
I was working on it today, and this is what i did. I started the forklift , disconnected the cables that come from a black box that also has a vacuum hose, anyways I disconnected the cables that come from the black box to the carburetor , but once I connected the cables again it wont run anymore, I had to depress the diaphragm on the valve regulator to get it to start. please help.

P.S the black box has the wires coming from the TPS and distributing them to the carburetor and the distributor.