Fuel filters, sized correctly in terms of flow rates and filter media is essential for safe flight. SDS recommends and supplies billet style filters that use 40 micron filter media. This media is much smaller (finer) than the media found in traditional aircraft fuel filters many of which were designed with carbureted engines in mind.
I made a conscious decision to locate my filters within the wing roots as this location is easily accessible for periodic inspection, cleaning and if necessary replacement of filter media. I do not recommend installation of these filters under the seats as this location does not facilitate easy access. Further, if there is any spillage of fuel, it will be outside the fuselage.
The first pix shows the original installation. You will note that due to the 90 degree fitting at the bottom, filter servicing requires removal of the filter bracket. Yo will see some black square spacers (temporary) that I was using to space the bulkhead fitting outboard. This is not ideal.
Subsequently, the bracket was fitting on an angle, to provide clearance in the wing root, and a straight fitting used to connect the filter to the fuselage. Now when removing the filter it is only necessary to loosen the retaining band on the mounting bracket and undo the top and bottom filter connections. Now the filter slides straight out at the top.
Not shown in the pictures is a 5 degree bevel I made on the base of the mounting bracket as well as addition of a few spacing washers on the mounting bolts (between fuselage and mounting bracket base). This moved the filter outboard and provides clearance for the filter from the fuselage.
In the second pix you will note there is a 135 degree hose end on the filter. This will be used to connect the top of the filter to the fuel tank outlet.
Once located on the fuse, I installed nutplates for the mounting bracket cap screws. The supplied mounting cap screws were replaced with longer screws.
You will also notice that there is no valve etc. to isolate the filter from the tank. If / when maintenance is required, one simply needs to ensure that the fuel in the tank is at or below below 10 USG and the fuel connection to the top of the filter is kept above the fuel level in the tank (a zip tie is handy for this purpose).