I'm not sure where you read that... A gas leak is a gas leak. Admittedly, if it holds pressure for 5-10 minutes, it "should be good" but what if it doesn't hold pressure for 11 minutes?? In other words, where do you draw the line?
I've always been taught to use a manometer to pressure test the LPG system and to leave the manometer hooked up for at least 15 minutes. Most "patient and thorough" technicians will wait at least 30 minutes before declaring the system "leak free" and I know several that insist on leaving the manometer hooked up for at least an hour, some even test it "overnight"...
Waiting 5-10 minutes is, IMHO, not long enough.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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