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Navman Diesel Fuel Flow Sensors Manual

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Diesel fuel flow sensor kit Installation and Operation Manual
31
NAVMAN
7-5 Test running and installing the sensors
This section describes how to test run the
engine and then install the flow sensors in place
of the straight through installation pipes:
1 When you have both supply and return
lines connected up and all fittings
tightened, bleed the fuel lines. This is the
same procedure you use after changing a
fuel filter - consult your engine manual.
2 Turn on the fuel tap at the tank. Run the
engine for 5 minutes. This will flush any
particles that you have introduced in the
installation process into the supply line
down to the secondary filter. Any particles
in the return line will be flushed back to
the tank. Check for pipe leaks.
3 Once you are happy with the pipework
changes, turn off the fuel tap at the tank.
4 Wear gloves to protect your hands from
the diesel fuel.
5 Put a tray of rags under the pipe where
you will disconnect it to absorb the fuel
that will spill.
6 Undo the fittings on the straight through
pipes and remove the straight through
pipes. Remove the ¼ NPT adaptors
from the ends of the install pipe. Clean
the thread sealer from the threads in the
install pipes and fittings.
Hand tighten the connections.
10 Screw the sensor to the mounting block
or support panel with the screws supplied.
11 Do up the fittings tightly with the correct
tool, except for the fitting on the outflow
side of the sensor in the supply line.
Leave this loose temporarily.
On flare nuts, use a spanner or wrench
on the flare nut, and another on the flats
of the barrel union. Flare nuts need to be
Tip: Keep the straight through pipes in a
safe place near to the sensors - you may
want them if you ever have to remove
the sensors, for service or to move the
system to another boat. If you have the
straight through pipe you can just put it in
the gap where the sensor came from, and
no re-work of the pipework is necessary.
7 Apply new threadseal to the ¼ NPT
adaptor threads (see section 7-5-2).
Warning: Make sure pieces of the
threadseal tape or paste can not break
off and enter the fuel pipe (see section
7-2-5).
8 Screw the adaptors into the real sensor.
Do not overtighten the adaptors - the
sensor body is diecast aluminium and
applying too much force when tightening
the adaptors will strip the threads.
9 Put the sensor in position:
Fit the sensor with the blue band in
the supply line.
Fit the sensor with the red band in the
return line.
… 31 …


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Navman Diesel Fuel Flow Sensors User Manual - German - 34 pages

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