are you using the right flare for your fittings there are two diffrent flares 45 and 37. if you put a 45 to a 37 degree fitting it would cause a sizable leak. also if you take your time and set the line in right on the mechanical double flaring tool they come out great. i have never had a problem but its the only way ive ever done them too i quess. MO


MO's 1951 chevy 3100 resto mod project