After reading the reply from Keifer I contacted Seastar Solutions (a distributor for Seirra products). I spoke w/ their tech support & they stated that the Seirra spin on fuel filters are for gas only. And they do not have any spin on canister for diesel that fits that bracket. Yet in their web info they state "filter media specific for gas & diesel fuel applications". I asked why the spin on filters should not be used with diesel - "I don't know, we haven't done any testing with diesel fuel". I have been running my set for over 2 years w/o any problems BUT, in light of the current info, I would NOT recommend This set up. It's back to the drawing board.