Connecting CNG High Pressure (Gyrolok-Type) Fitting

Tighten the fitting in 2 stages. Tighten the tube nut until snug. Tighten an additional 1/2 turn. Pressurize CNG system and inspect fittings for leaks. Perform COMPRESSED NATURAL GAS LEAK TEST under FUEL SYSTEMS in SYSTEM & COMPONENT TESTING - EEC-V - NGV article.