Careful
There are other recent threads on this..the primer system works great. Pumping the throttle works great..EXCEPT, that is shooting fuel straight up from the carb, and a failed start can lead to airbox/engine fire. The primer system puts the fuel into the combustion chamber where it belongs. I have experienced said fire in a Cessna 150, and its no bueno. I have the VANs electric solenoid system on my -4, and it has been flawless.