[~The Jester~]

Instructions??? Who reads those??? That thing ain't tight enough bro. Problem is once it starts leaking, it's not gonna quit. You need a new nylon washer, and tighten that puppy up. Don't get carried away, you're playing with aluminum, so don't overtighten. It's a careful line there.

Also check the threads in the pump itself for damage, and the threads on the line. You may be barking up the wrong tree.