On Sun, 24 Apr 2005 09:30:04 -0400, "Glenn Ashmore"
wrote:

Yesterday my neighbor had to show off his new diesel pickup. It has one of
those trip computers that displays MPG and range so I was interested in
seeing how the fuel flow sensors were set up. By tracing the supply line
from the injector pump it was easy to find the supply side sensor but the
return line, instead of going back to the tank went through a finned cooler,
then into a heat exchanger cooled by the new fuel and back into the supply
line after the flow sensor. That eliminated the need for a second sensor on
the return line which simplifies the net flow calculations, maintains the
fresh and recycled fuel at the same temperature so the density is constant
which further improves the accuracy of the flow measurement and reduced the
load on the filter.

Anyone seen this setup on a boat?


On a boat no: - but I remember the notes of a fellow who converted a
(Fuel Injected) subaru for an experimental airplane. He returned the
excess fuel to the feed line, and was hit by problems that turned out
to be due to the return fuel [GASOLINE not diesel] bubbling when it
hit the low pressure feed. He returned the fuel to the tank, and lived
happily ever after, which was formerly in doubt....

Brian W