navman fuel transducer

[dazza]

hi all,
have a navman fuel transducer, was working like a treat but now not accurate. telling me i am using 6l/hr at full noise.
i wonder if there is not a bit of something stuck in it, it is before my fuel filters, so this is quite possible,
any suggestions??
cheers
dazza

[aido]

take the tranducer out and clean it out,
carefully, i think there is a procedure in the manual.

[dazza]

hi aido,
my manual dosen't really shed too much light on "cleaning out" might try to squirt some fuel through it and see what happens
cheers
dazza

[smerl]

I would give Navman Australia a call be for eyou do anything to drastic. I have called them before when I was having trouble with my chartplotter and they were very helpful. Their contact details are:

Navman Australia Pty Ltd
Suite 2, 408 Victoria Road
PO Box 479
Gladesville
NSW 2111

Tel : +61 2 9879 9000
Fax: +61 2 9879 9001

Cheers

Smerl

[aido]

from the transducer manual....

2 My fuel computer is giving high or erratic readings
a) This problem is almost always caused by air
getting into the fuel suction line before the flow
transducer. Check all of your fittings up to the filter
for signs of air leaks. One of the most common
causes is if customers use metal hose clamps
rather than the plastic compression clips provided
as the metal clamps if over tightened distort the
flow transducer tails and allow air ingress. This air
then accelerates the turbine, which consequently
becomes erratic and over reads.
b) Check that the fuel line is clean, i.e. that the
transducer is not clogged up with dirt, and
check that the turbine is spinning freely. This
can be done by very gently blowing into the
turbine and listening for a whirring sound. This
must be done carefully because the turbines
are made to spin in petrol, which acts like a
lubricant. If the turbine is spun too fast in air the
bearings can be damaged, in which case the
transducer will be ruined.
c) Each flow sensor is generally accurate to +/- 10%
out of the box and as each fuel transducer will
have slightly different characteristics then onboard
calibration may be required. We have found that
by methodically going through the manual many
calibration related problems are solved. There is a
good section on calibration in each user manual.
3 My fuel computer gives erratic or low readings
a) This is usually due to dirt or contamination in
the fuel line clogging the transducer if it is the
older style screw apart transducer you may
open the transducer and clean the internal
gauze filter. If you have the current one piece
flow transducer then it will have to be returned
to your distributor for strip down and service,
which requires special skills and tools.
b) Another cause of erratic readings is the way the
newer EFI engines operate which is by delivering
fuel to the engine from a fuel reservoir. This
reservoir (or bowl) is refilled from the main fuel
tank only when the bowl level is getting low. This
produces a high flow rate through the fuel
transducer when the bowl is filling and little or no
flow rate when the bowl is not filling. Although the
fuel flow transducer can accurately follow these
changes, it can be difficult to display the fuel flow
rate due to the rapid variation. Please contact you
local NAVMAN dealer for any further questions
or advice.

[scubapro]

Dazza,

Try this site

http://www.navman.com/marine/support...ndex.html#2100

Scubapro