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Old 04-13-2019, 07:10 AM
Burtonport Burtonport is offline
Join Date: Sep 2013
Location: Watertown, New York
Posts: 49
Default RV12iS Fuel Tank Leak Test

Hello. I am going to leak test my recently built RV12iS fuel tank. I have seen other references in the past that mention leaving the unit sealed with air for 24 hours and then verify that the balloon does not lose too much air. It seems like a good idea but I donít see any reference to the 24 hour wait period in the Fuel Tank Pressure Testing instructions. It just mentions checking the tank with soapy water and looking for bubbles.
Was the 24 hour waiting period something that was used in older instructions?
Damien Graham
Watertown, NY
VAF dues paid until 7-20
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Old 04-13-2019, 09:04 AM
Mich48041 Mich48041 is offline
Join Date: Apr 2008
Location: Riley TWP MI
Posts: 2,886

A 24 hour test is not necessary. The pressure will fluctuate as atmospheric pressure changes over time. That change might lead one to believe there is a leak when there is none.
Joe Gores
RV-12 Flying
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Old 04-13-2019, 12:55 PM
rvbuilder2002 rvbuilder2002 is offline
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 8,286

Originally Posted by Mich48041 View Post
A 24 hour test is not necessary. The pressure will fluctuate as atmospheric pressure changes over time. That change might lead one to believe there is a leak when there is none.
Which is why the KAI recommends a procedure of using a soap bubble test.
If you already have the tank slightly pressurized anyway, it takes only a small additional effort to brush a soap solution over all the joints.
A lot of people just put it in the bath tub and then rinse it off well when done.
Any opinions expressed in this message are my own and not necessarily those of my employer.

Scott McDaniels
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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Old 04-15-2019, 11:36 AM
RFSchaller RFSchaller is offline
Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 2,509

After 7 years my tank is still tight. I did the soapy bubble test on all the seams and fittings. Drop tests are Ok, but to my thinking all they do is tell you if something is leaking: no indication of what or where, so you might as well just do the soapy bubble test. Remember the leak in a drop test might be in your test rig or itís fittings.

At the time I put the tank together and saw those big holes at the corners I thought there is no way this sealer will make this leak tight. Fortunately I was epically Wrong!😝
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Old 04-15-2019, 06:32 PM
rcarsey rcarsey is offline
Join Date: Jul 2012
Location: North Brunswick, NJ
Posts: 129

I did the soap test.. no signs of leaks.

I made the mistake of letting my Dove soap dry without rinsing it off (it was summer, it dried on its own [aka. i forgot]).

Not sure if it was something in the detergent or if the spray bottle was contaminated with something, but the entire tank showed signs of surface corrosion after a few months. I took a sander to the tank (until i could no longer see where the corrosion was).. I'm sure most of the Alclad is gone. I sprayed with primer. And the carpet will cover almost all it anyway.

Rinse your tank when finished!.
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