Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Pressure washer engine? Have you removed the carburetor bowl and checked it for water? Do you have good flow of fue from tank to the carburetor inlet?
With old hose, you may have a piece of debris stuck in the inlet port with the needle valve. I would replace the fuel line, and clean the needle valve port and fuel inlet to the carburetor.
The on/off switch is easily tested by removing fuel line at carburetor, and opening the valve, fuel should flow freely. Here is link to carburetor pictures.
Float has to have pin removed, to let it come down with the needle to open the passage. If there is debris, it needs to be blown out in reverse, from needle passage to fuel inlet.
yes, and float moves needle valve up anddown