Are you leaking any fuel? I got my Cat Adapter and put it on. It has a slight leak. Came to find out, with the help of Nick at Nicktane, that my filter head was warped. Got a new filter head and installed the adapter, problem solved. I have changed the Cat filter twice and no leaking. I would take the adapter off and see if the o ring has not properly seated itself or if the o ring on the bleeder screw is bad. Good luck.
Justin 2001 LB7 Silverado 2500HD LT CCSB 4x4.
EFI Live by Idaho Rob, 415K+ and rolling, Undercover Bed Cover, Vortex spray in bed liner, Westin steps, Bilstein Shocks, Road Master Active Suspension, M/A Pump Rub Kit, MBRP 5" Exhaust, Edge Insight CTS, K&N drop in filter, AirDog II 100 w/ CAT 751, LLY FF Housing w/ Racor, Running on LMM Blacked out Wheels & Michelin LTX M/S2 tires.
ADRENALINE TRUCK PERFORMANCE
Lincoln Diesel Specialties