Originally Posted by Guy
Nice but why 2 pumps? I guess if it's a boat part one will probably fail? Do you use O ring fittings or pipe thread because you sure have a bunch.
When you follow the link I posted above the picture, then you get the full blog entry with pictures etc.
There are two pumps for different applications: one is mainly for bleeding everything that comes behind it and also a boost pump to help push fuel through a mostly clogged filter in tight situations. The output of this pumps connects to the feed-manifold.
The second pump connects to the return manifold and it's main purpose is polishing and also transferring fuel between tanks
Both pumps draw from the transfer manifold and share the same filter turbine on their vacuum side.
The manifolds are very easy to make: just 1/4" bras/bronze T's and nipples and I used Permatex Hi-temp thread sealant
(rated for hydraulics). Everything is bone-dry, no sweating. The mini valves are very nice and can be seen on the pictures. I think Port Supply (West Marine
wholesale) has everything that I used.
I designed this system many years ago but took the core
of it from how this is done aboard Nordhavn trawlers. It's proven design and never required any maintenance
other than cleaning
the filter over the years.
The system becomes much simpler with one tank only, without genset etc.