I"m using hose with barb fittings. I have 5/8" return lines
and 3/8" feed lines. I didn't have the right size barbs for
my secondary filter so I had to use a reduction barb.

Everything is double clamped.

The fuel is definitely good, from a clean tanks, and all
filters are new. The only thing I've changed recently is
the electric pump.

"DSK" wrote

What kind of fittings, what kind of hose, Bart? I happen to like flares
but a lot of people like compression fittings of one type or another. I
have worked with flare fittings on hi-pressure air, hydraulics, various
gasses, and other stuff, for about 30 years and the biggest problem I've
had in over ten years has been our own fuel system!