Okay I'm new to the rhino, I recently bought a used 660 (04 model). It has an aftermarket electric fuel pump. The problem I'm having is I believe it is vapor locking but I'm not sure. It only cranks over when it wants to. I can pull the spark plug and crank it over, put the spark plug back in and it will start. Now if I turn it off or it happens to quit it will not crank over until I pull the spark plug and repeat. I do know the fuel pump that was put on is putting out to much pressure (5 psi). Any suggestion? Thanks in advance.