Get engine hot first for easy restart.
Turn the fuel stop to off, this will stop fuel running back into tank,
The primary filter screws off for replacement through a bolt on top, it comes apart into 2 parts bottom with drain off valve, then filter itself. Replace "o" rings and put a little diesel on it, not a difficult job. A Friend told me today he used a small funnel to fill this filter when replaced.
Secondary filter is mounted upright (so fill replacement with fuel first), mounted near the top of the engine, left side of engine looking from front.
When replaced there will be air in the system so you need to get as much out as pos, by venting through a bolt on the top of the filter housing that has a slot milled in it so you can vent air out when unscrewed and at the same time pump the little lever up and down, all this is on line and there are pictures as well.
pictures show both filters
You can look on utube for a video.
Important points, engine hot and fuel stop valve off.
Odysseus.
