Not sure the Pex clamps meet the ABYC recommendations. The part about corrosion resistance equal to 300 series S/S and they must be reusable. The problem is that if you use non approved clamps it may show up on a survey and then the insurance company may make you fix it. Do some more research before you do it.
Hose Clamps on Diesel Fuel Systems
NOTE: Some USCG Type A hose is not designed to be clamped.
Flexible hose shall be equipped with permanently installed end fittings, such as a swaged sleeve or a sleeve and threaded insert, or may be secured with corrosion resistant metallic clamps.
Flexible hose not equipped with permanently attached end fittings, such as swaged sleeve and threaded insert, shall be attached with corrosion resistant metallic clamps.
Clamps depending solely on the spring tension of the metal shall not be used.
Clamps shall be installed to impinge directly on the hose and shall not overlap each other.
Clamps shall be beyond the flare or bead, or fully on serrations where provided, and at least 1/4" (6 mm) from the end of the hose.
Hose used in the fuel tank fill system shall be secured to pipes (smooth pipes acceptable), spuds or other fittings at each connection, by at least two corrosion resistant metallic clamps with nominal band widths of at least 0.5" (12 mm).
Hose connections used in the fuel tank vent system or the fuel distribution and return line system shall have at least one corrosion-resistant metallic clamp with a minimum nominal band width as indicated in the table below.
All components of hose clamps shall have a resistance to corrosion equal to or greater than 300 series stainless-steel.
Hose clamps shall be reusable.
Hose clamps shall be corrosion resistant metallic clamps with nominal band widths of at least 0.5" (12 mm)
Hose-Clamps-Table2