Navman FUEL 3100 Installation And Operation Manual page 22

b Speed sensor cable is unplugged or
damaged. Perform a visual check.
c Speed calibration is incorrect (see sections
3-8 and 3-9).
d Interference from electrical noise may be
affecting the measurements. Review the
installation.
5 Low Fuel Alarm sounds when fuel not
low:
The fuel REMAINING reading is incorrect.
a
The fuel tank capacity (SIZE) may be
incorrect, or the fuel REMAINING setting
may not have been updated after a refill.
See sections 2-6. and 5.
6 The display unit fogs:
a Moist air has entered the breathing tube at
the rear of the unit. Air the boat or run the
instrument with backlight fully on.
b Water has entered the breathing tube.
Return the instrument for servicing.
7. Flow indicates no fuel or low fuel
a FUEL 3100: Check that the fuel cable
connectors are securely plugged in and
the collar is locked in place. The collar must
be locked in place to give a watertight
connection.
b A fuel sensor may be clogged. If so, remove
the sensor from the fuel line and gently
blow through it in the opposite direction to
the fuel flow. A fuel filter between the fuel
sensor and the fuel tank must be installed
as per the fuel installation guide. Failure to
do so will void the warranty.
c Inspect the fuel cable from end to end for
damage such as cuts, breaks, squashed or
trapped sections.
d Check that the fuel filter is clean.
22
8 Fuel used or remaining seem inaccurate:
a In rough seas, fuel may surge back and
forth through the fuel sensor, resulting in
incorrect readings. Try installing a one-way
valve between the fuel sensor and the fuel
tank.
b The amount of fuel must be reset after
every refuelling (see section 5 ).
c The fuel tank may not refill to the same
capacity each time due to air pockets. This
is particularly noticable with underfloor
tanks (see section 5).
d Petrol fuel sensors wear out over time and
should be replaced after every 5000 litres
of fuel.
9 A twin engine installation shows only
one flow rate:
a Check that the number of engines is set to 2
(motor in the FUEL menu, see section 3).
10 There is no reading for fuel economy:
a The boat must be travelling through the
water to generate an economy reading.
b If an optional paddlewheel sensor is fitted,
check that the paddlewheel spins freely.
NAVMAN
FUEL 3100 / DIESEL 3200 Installation and Operation Manual