So if the vacum part of the valve is failing you can just replace the - "COVER SET,****" ?

Did you need to take the gas tank and petcock etc. to get access?

 

I did buy the petcock off of ebay. it is working great. however it would not work when i first got it. the diaphragm was full of corrosion. once i disassembled it and cleaned it everything was fine. I would buy one of these again if needed, especially for the price. the only reason I did not just buy a new seal kit, was because my petcock was leaking fuel where you can not rebuild it.