I'm doing a little plumbing under the hood and I'm trying to find out what size/thread the fuel in/out fittings are on the spin on filter head.

Also the fittings on the filter on the back of the head.

Last time I did this kind of thing was on a 7.3 IDI filter head. After a month of trial and error I finally asked on a forum and was informed by EVERYBODY that it was a proprietary fitting that I has to get from International.

It was one of those things that everybody just knew. Except me.

So this time I thought I'd forego the month of trial and error and just ask right away. fuel filter.jpgfuel filter.jpg