EUROSENS
Fuel
flow
meters.
Operation
manual.
ver.
1.6
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Page
21
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30
Fig.6.
Installation
under
scheme
«on
suction
side»
with
fuel
supply
pump.
Check
valve
is
necessary
only
for
“Direct
P,
PH”
series.
Under
successful
operation
of
the
injectors
their
return
flow
is
not
more
than
0.1%
of
fuel
consumption,
so
it
can
be
neglected.
To
prevent
measuring
the
volume
of
fuel
returned
to
the
fuel
tank
it
is
necessary
to
change
the
circuit
return
line.
For
this
special
case,
it
is
necessary
to
change
the
fuel
pump
return
line
so
that
the
fuel
is
circulated
in
a
small
circle
without
return
to
the
fuel
tank.
This
is
done
by
connecting
the
return
to
the
input
of
the
fuel
supply
pump.
Thus,
to
the
inlet
of
supply
pump
two
lines
are
connected:
1)
supply
from
the
tank,
passing
through
the
flow
sensor;
2)
The
return
fuel
pump.
Thus,
through
the
flow
sensor
Direct
goes
only
the
amount
of
fuel
which
is
consumed
by
the
engine.
WARNING!
One
of
the
advantages
of
fuel
return
to
the
tank
through
the
fuel
line
is
heating
the
rest
of
fuel
in
the
tank.
Therefore,
if
vehicles
work
at
low
temperatures
it
is
recommended
not
to
change
the
scheme
of
the
fuel
but
to
use
differential
flow
sensor
Delta,
or
install
extra
fuel
heater.
To
install
Eurosens
Direct
"on
suction
side"
in
the
engine
fuel
system
without
the
fuel
supply
pump
(see.
Fig.7),
it
is
necessary
to
place
the
flow
meter
between
the
fuel
pre
‐
filter
and
the
fuel
pump
bypass
valve.
At
the
same
time,
an
additional
fine
filter
in
the
area
between
the
place
of
installation
of
the
flow
sensor
and
the
pre
‐
filter
should
be
installed.
