I just purchased the Cat fuel filter 1R0750 and it does not have a center post gasket. I think that some fuel can bypass the filter element by going through the threads. Anyone have any thoughts on this?

Can a large nitrile 'O' ring be used to make a seal for the threads? Will the nitrile 'O' ring stand up to diesel fuel?

 

yes get the thickest 1" or 15/16 oring that u can find, buna-n is nitrile.