Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Welcome to JUST ANSWER small engines, let me try to help you !! I don't know it all, but maybe together we can get you a satisfactory answer!
Cap has to seal, dealer is full of BS. Caps are available with different depths to the seating area, just measure depth in radiator connection , and take cap to auto supply to find one that will seal. Needs to be at least 7 lbs. 14 is ok. What is the Model number of the mower?