Fuel Filter replace,what's the oring size ?


What is the filter # that you're using? There are many that are similar in appearance. They don't all use the same sealing rings and fittings.
If you're using the filter discussed here and fuel lines with the correct fittings on the connecting end the GM# is 22514722. Most after-market vendors should be able to do an interchange from that information. NAPA could be CRB 212301.
These are for a 3/8 fuel line using a 16mm Saginaw sealing system. There are adapters to use this filter type converting it from the 16mm Saginaw to conventional AN fittings if that would make life easier for you!
Scott



