Northstar Explorer 557/567 Installation and Operation Manual
73
2-6 Autopilot not responding to 557/567; no
NMEA output:
a NMEA output disabled or the required NMEA
sentences are not turned on. Check NMEA
settings (see section 15-10).
b Check that the instrument is connected
correctly.
2-7 No DGPS fix or loss of DGPS fix:
a To receive a DGPS fix, WAAS/EGNOS must be
enabled or an optional DGPS antenna fitted
(see section 7).
b With WAAS/EGNOS: Boat out of coverage
area (see section 7).
c With WAAS: GPS antenna does not have a
clear view of the horizon towards the equator.
b With beacon DGPS: boat out of range of a
DGPS beacon.
3-1 Number of engines or tanks is wrong
Check that the number of engines and tanks
is correct (see section 15-4).
3-2 Fuel flow(s) seem inaccurate:
a Check that the fuel setup data is correct (see
section 15-4).
b Check that the fuel cable connectors are
securely plugged in and the collar is locked in
place. Check the fuel cable is not damaged or
pinched.
c A fuel sensor may be blocked.
A fuel filter must be installed between the
fuel transducer and the fuel tank as described
in the sensor installation manual.
Otherwise the warranty is void.
d Recalibrate the fuel flow sensor(s) (see
section 10-7).
e Check that the fuel filter is clean.
f In rough seas, fuel may surge back and
forth through the fuel sensor(s), resulting in
incorrect readings. Try installing a one-way
valve between the fuel sensor(s) and the fuel
tank.
3-3 Fuel remaining seems inaccurate:
a The 557/567 is not wired for auto power (see
section 15-4).
b You added or removed fuel but did not tell
the 557/567 (see section 10-3).
c The fuel tank may not refill to the same
capacity each time due to air pockets. This is
a particular problem with underfloor tanks.
3-4 Erratic fuel flow readings:
a The Flow filter value is not suitable for the
engine. Check that the value is not set to zero,
then try increasing the value until a steady
flow rate is shown (see section 15-4).
b The fuel flow sensor(s) may be too close to
the fuel pump or may be subject to excessive
vibration. Refer to the fuel sensor installation
manual.
c Check for leaks in the fuel line or in the fuel
pickup in the tank.
3-5 There is no reading for fuel economy:
a The boat must be travelling through the
water to have a reading.
b If you selected a paddlewheel sensor (see
section 10-5-1), check that the paddlewheel
spins freely.
B-3 Fuel consumption problems
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