Well I bought a third generation pro 4. Leaking fuel right out of the box! Called Jiffy and they told me to check a few things and depending on the results they would determine what need to be done, encluding replacing the power head at no cast to me! Turns out it was leaking from the connection between the hose end that goes to the carb. New one on the way. I have read bad reviews about Jiffy customer service, but seems like they are pretty willing to help with problems.
Keep it safe! JDL
