Float Level Testing
The float level cannot be tested 100% using this method, however, it can reveal a stuck float or a large incorrect float level - which will let you know which carb has the problem.
This testing can be done with the carbs on the bike on the centerstand.
- Clear tubing that fits the drain nipple of the carb's float bowls
- Method to short the fuel pump relay/fuel pump or alternate fuel source
- Hook clear tubing up to the drain nipple on the carb. Hold the open end of the tube up against the carb.
- Now unscrew the float bowl drain screw.
- Short the fuel pump relay/fuel pump or hook up your alternative fuel source.
- The fuel pump should stop pumping as the float needle shuts off the fuel source.
- If the fuel pump doesn't shut off and the gas level doesn't rise, then another carb's float needle is not sealing or you have a gas leak.
- The fuel level in the tubing should stop where the float bowl meets the carb body.
- If the fuel level continues to rise in the tubing, it means that carb's float needle is not sealing.
Pictures courtesy of Billy Carr