We are having quite a few customers come in with machines that haven’t been plugged in for a year or more. One came in that hadn't been used for 12 years! After sitting for ANY amount of time, I.e. a month or more, start out by plugging it in and making sure that the motor runs!. Then prime with water first to make sure that it will prime and then build pressure. And do this BEFORE you go out on the job.
If you wait and take for granted that everything will work, you are gambling with your time and energy. If you just put it in paint and it doesn’t prime or pressurize, you then have a wet machine to manually clean before repairs can be made. If you are on the job, this is a mess and you have to spend time going back to the shop and starting over.
Think of it like you would a car or truck. If you hadn't started the vehicle for a year or two or twelve, and are planning on a cross country trip, would you load up all of your luggage and family and then see if it will start?
