Step 1: Remove the cap.
Step 2: Insert the Diesel Guard.
Step 3: Place the adaptor onto the filler neck.
Step 4: Slide the first half of the split ring under the Diesel Guard, lining up the holes.
Step 5: Insert the first 3 snap-off screws and tighten.
Step 6: Repeat steps 3 and 4 for second half of split ring.
Step 7: Screw the cap onto the adaptor and tighten the wire loop.