I use 2 o rings per fitting. Do it all the time. Never leaks!! Knock wood.
jaybrd,
By the way your tank is backwards.
I've had this fuel line like this for 10 years with 2 rubber o rings per side. Someone made fun of it back then and I said I'll fix the line when it starts to leak. Well 10 years and no leak. Guess what it's staying.
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