Moki 2.10
RH, Thanks for the information. Everything was set up correctly before I installed the pump - large ID tubing from large ID clunk to carb and the tank was positioned correctly. The engine used to go lean on up-lines, so I had to richen the main needle to prevent this. I then had a crappy midrange. The front edge of the tank is 14" from the back of the carb. With the pump, the mixture settings don't change and I have much better throttle control. What prop do you use?