Hangar Flying

Hangar Flying => Hangar Flying => Topic started by: walter on April 03, 2007, 12:46:27 PM

Title: leak detection
Post by: walter on April 03, 2007, 12:46:27 PM

I am currently in the process of pressure checking the fuel tanks on my varieze. The tanks will not hold presssure. The bleed down time from 3000' is approximately 1 minute. My connections are sealed. The hose is new surgical tubing type so I don't think it is the equipment or process that is flawed.
Anyone have any suggestions on how to find the leak other than the cigarrette smoke method mentioned in the plans?

Title: leak detection
Post by: admin on April 03, 2007, 03:32:32 PM

I remember that someone using a freon leak detector. There are
very sensitive and it took only minutes to find the leak.

Title: leak detection
Post by: walter on April 03, 2007, 04:23:51 PM

I wonder if an auto parts store would have a detector I could use?

Title: leak detection
Post by: Waiter on April 03, 2007, 06:44:10 PM

Walter,

This leak sounds substantial enough that you may be able to use soap solution to find the leak.

Before you invest to much time and energy, try this:

Pressurize the tank (blow into it, no more than about 1/2 psi (150kts)

Mix about 2 or three tablespoons of dishwashing liquid into a cup of water.

Use a paint brush and start brushing onto fittings, connections, joints, corners, etc. look for bubbles.

Waiter



Double check

Title: Leak detection
Post by: EZRider on April 03, 2007, 07:52:59 PM

Make sure it is not the fuel caps that are leaking.  They do not seal all that well.

Title: leak detection
Post by: walter on April 03, 2007, 08:28:50 PM

I knew they would not seal well so I have put off installing them until I get the pressure test done.