Hello All:
I have been researching this but of course everyone has different circumstances. I have just tested my first tank. I used my air compressor and turned it down all the way just so I would feel small bits of air coming from the nozzle (did not even register PSI on the guage). I then double zip tied balloon to the vent line. Capped off all fuel return and supply lines with AN fittings and teflon tape etc.
Blew air into the fuel strainer and allowed balloon to inflate to about 10" diameter. I sprayed the **** out of the tank with soapy water with a flashlight to see better. ABSOLUTELY NO BUBBLES ANYWHERE! I did this several times.
I was super excited and thought I had a leak free tank
I spoke to soon :-( :-( My balloon was deflated within 2 hours. My fuel cap was taped over with masking tape. I sprayed edges of the tape and no bubbles.....
SO WHY IS THE BALLOON DEFLATING?? I had to take a break for the night because I was so furious haha.
I did this test several times and approx 2-3 hours for balloon to slowly deflate. It was done approx 70 degrees in my garage with blue skies outside.....don't think this will have and influence .
Perhaps trying different balloon and wrap it better around the vent line fitting. I am pretty sure its tight around the fitting because I also sprayed the fitting and no bubbles from where balloon is connected.
I was told I should build a manometer but how will this help? Anyone have any links to fabricate home made manometer?
WHY is this happening. No bubbles but deflating balloon.
ANY help or tips will greatly be appreciated