I was reading an thread about changing the fuel filter and was thinking to my self, hmm... I haven't changed my filter since first purchased!
Looked over some website who sells the after market fuel filters and it says -8 fitting?

My question is, what size fitting does it take for 94 FD?

 

I wouldn't bother, you're just introducing another failure point into the FD's fuel system.

I recommend simply extending your fuel lines (with high pressure fuel injection hose) and clamping a new oem fuel filter to your rear subframe. Makes future changes a 5 minute affair. If you search around you can find pics.