Balance pipe - my Hawk tanks came with an outlet on the bottom that was the same diameter as the breather pipes in the top of the tank. I resulted in a very embarrassing situation at the MOT station where the fuel was returned to one tank but because the pick up was off a T in the balance pipe it wouldn't flow back to refill one side. Soon resulted in an overflow. oops.

All history now but the balance pipe was replaced with a 15mm OD pipe and, with the Alfa 164 pump in the tank and the return line to the bottom of the swirl poy I've had no fuelling issues since. Ignoring braided line failure due to rotted rubber that you can't see.......

Chris, glad to hear that the photographed installation wasn't the final one. That gave me a sleepless night I think!

Guy