EUROSENS
Fuel
flow
meters.
Operation
manual.
ver.
1.6
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Fuel
pump
return
line
should
be
changed
to
circulate
fuel
in
a
smaller
circle:
move
the
return
line
from
the
output
of
the
high
pressure
pump
to
the
fine
filter
and
lock
the
output
of
the
high
pressure
pump.
For
correct
operation
of
the
modified
fuel
system
you
need
to
move
bypass
valve
from
fuel
pump
that
maintain
the
required
constant
pressure
(1
...
1.5)
bar
in
the
area
of
the
fine
fuel
filter
and
inlet
of
high
pressure
pump.
At
the
output
of
the
flow
sensor
a
check
valve
(0.15
...
0.5)
atm
should
be
installed,
which
prevents
the
fuel
flow
through
the
flow
sensor
in
the
opposite
direction,
as
well
as
reduces
the
impact
of
hydrocracks
in
fuel
system.
Thus,
excess
fuel
from
supply
pump
will
go
back
to
the
tank
from
the
inlet
of
fine
filter
and
through
eurosens
Direct
will
flow
only
the
amount
of
fuel
which
is
consumed
by
engine.
Advantages
of
the
scheme
"on
pressure
side":
•
Eurosens
Direct
is
set
after
the
regular
fuel
fine
filter;
•
Reduced
flow
resistance
on
the
supply
pump
suction
side.
•
Return
flow
heats
fuel
in
the
tank.
Disadvantages
of
the
scheme
"on
pressure
side":
•
cooling
of
fuel
pump
decreases
a
little;
•
return
line
temperature
is
lower
than
in
the
standard
fuel
scheme.
4.4.3
Installation
of
Eurosens
fuel
flow
meter
under
"suction
scheme"
Installation
of
fuel
meter
"on
suction
side"
supposes
the
installation
of
a
flow
sensor
in
the
area
of
the
fuel
system,
where
the
fuel
flow
is
forced
by
suction
created
by
supply
pump.
WARNING!
Installation
of
Eurosens
Direct
flow
meter
"on
suction
side"
requires
an
additional
fuel
filter
on
the
fuel
line
from
the
tank
to
the
flow
sensor.
A
special
case
of
Direct
flow
meter
installation
under
"
suction
scheme
":
To
install
the
Direct
under
scheme
"on
suction"
in
the
engine
fuel
system
with
fuel
backup
pump
(see.
Fig.6),
it
is
necessary
to
use
the
site
between
the
fuel
pre
‐
filter
and
the
inlet
of
fuel
backup
pump.
