JackinMichigan
Well Known Member
We recently had to replace a number of fuel lines in some very hard to reach areas (in the forward part of the tunnel). After completing this arduous task we leak-checked the system by capping off the wing tubes and pressurizing the system with air thru the firewall to 50psi.
With an artist brush and a bottle of children's soap bubble compound I painted all the fittings and could not see any foaming anywhere, but the system pressure dropped about 3psi over 30 minutes. We decided to leave it overnight, and this morning it was down to 20psi (approx. 14 hours later). The total volume involved is equivalent to probably 12 feet of 3/8" aluminum tube.
Does anyone have any tips on how to locate such a slow leak? Soapy water, a flashlight and an inspection mirror don't seem to be cutting it.
With an artist brush and a bottle of children's soap bubble compound I painted all the fittings and could not see any foaming anywhere, but the system pressure dropped about 3psi over 30 minutes. We decided to leave it overnight, and this morning it was down to 20psi (approx. 14 hours later). The total volume involved is equivalent to probably 12 feet of 3/8" aluminum tube.
Does anyone have any tips on how to locate such a slow leak? Soapy water, a flashlight and an inspection mirror don't seem to be cutting it.