
It seems for me that the small rubber seal inside the fitting is always the problem with a fuel presser test gauge.I replaced mine with this fitting. It works really well and no leaks. I use it on GM and it's the correct size for that application.

Lucas Oil Fuel Treatment Quart - Tan Color, 1QT Size
31 Review

Restore Your Diesel Engine Performance With Archoil AR6400-D Fuel System Cleaner
31 Review

GOOFIT PD18 18Mm Carburetor For 4-Stroke GY6 49Cc 50Cc Chinese Scooter 139QMB Moped Replacement - Taotao Kymco Jonway Baja
19 Review

Hy-Per Fuel Complete Gas System Cleaner By Rislone
24 Review