I had my Dolium 45L tank fitted to my Puma by OL in Darwin, and it leaked initially requiring 3 subsequent trips for them to get it right. They changed the washers in the connection of the small draining hose at the aux tank end - fixing that leak. In the end they realised they had moved the fuel breather outlet to a position below the upper level of the aux tank and as such diesel was siphoning out... The position they had left the breather was also fairly vulverable to water crossings...

I am sure other fitters must be better than OL Darwin (that's not the only issue I had).
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