I have posted three pics showing how the vented loop has been
installed on my Perkins in my Super Maramu. Look for them in
the "Super Maramu - interior" photos folder on this site.
I recommend Nigel Calder's "Boatowner's Mechanical and Electrical
Manual". He has a good write up on pages 258-259 (with drawings) on
siphon breaks for engine installations both above- and below- the
All the best,