I have a Perry pump I bought second had with a GMS 120 2 stroke. I have fired it up but it seems to delivery to much fuel. The pump is silver colour with Perry written on it. On the back plate there is a small hex bolt, is this a flow adjuster?? And if so which way do you turn it.

The other problem I have is I only run a line from the tank to the carb, Do I need a pressure relieve line to the exhaust as it seem the pump is causing a vacuum in the tank. The other question is I was going to put a bypass line on the main fuel line to carry excess fuel back to the tank is this a must too ??.

Hay thanks for any input!!!!!!!!!!!