Pg. 28-06 Step 10: Inserted a nut and sleeve over the fwd end of the Fuel Return Line and flared the end. Straightened the curve from step 9 and slid the line fwd to the installed position. Attached the line to the bulkhead clamp. Step 11: Installed the Union Bulkhead Fitting to the Firewall Shelf. Attached the Fuel Return Line to the Union Bulkhead Fitting.