Operation Manual

28
Diesel fuel flow sensor kit Installation and Operation Manual
NAVMAN
7-4 Installing the temporary straight through pipes
Before fitting the straight through pipes, plan
where the sensors will be fitted (see section
7-3). This section describes how to fit the
temporary through pipes where the flow
sensors will be fitted. The actual sensors are
not fitted until later, after the engine has been
checked (see section 7-5).
1 Wear gloves to protect your hands from
the diesel fuel.
2 Turn OFF the fuel tap at the outlet of the
boat’s fuel tank.
3 Put a tray of rags under the pipe where
you will cut it to absorb the fuel that will
spill.
4 Disconnect or cut the fuel line where the
supply and return sensors will be fitted.
To cut solid pipe, use a pipe cutter. Do not
use a hack saw - it will leave small metal
particles in the pipes that will harm the
sensor and other items in the fuel line.
5 Fit the temporary through pipes in the
supply and return pipes where the
sensors will be fitted. Note:
The two flow sensors will be mounted
horizontally, with the wire connectors
underneath. It does not matter which
fuel connection is the inlet and which
is the outlet (see 7-3).
The exact details of how you fit the
through pipes will depend on where
you are installing the through pipes
and the configuration of your engine
installation. Instructions for the
common case of installing the pipe in
the middle of a solid copper pipe run
are given in section 7-4-1. If in doubt,
consult a qualified diesel engineer.
Apply thread sealer to the all fittings
(see section 7-2-5)
Warning: Make sure pieces of
the threadseal tape or paste can
not break off and enter the fuel pipe
Do up the fittings tightly with the
correct tool. The through pipe has
flats for attaching a spanner or
wrench.
However, when fitting the through
pipe in the supply line, tighten the
inlet connection but leave the outflow
connection loose temporarily.
Keep a real sensor on hand and use it
to check for available space, that the
fuel line aligns with the sensor ports,
and that the cables and connectors
will not be difficult to get to later.
When the sensors are fitted later they
must be firmly attached to a panel
in the boat or a mounting block. If
necessary, fit the mounting block
now. Check that the sensor can be
attached to the boat without straining
the pipe joint.
6 Carefully open the fuel tap at the fuel tank
until fuel drips from the joint at the outlet
of the through pipe in the supply line. This
should have filled the pipe and first joint
with fuel - meaning there will be less air in
the system that has to be bled out to start
the engine. Turn the tap off.
Note that there is no need to expel air
from the return pipe - it will happen
automatically when the engine starts and
fuel starts flowing.
7 Tighten the connection on the outflow
side of the supply through pipe with the
correct tools.
8 Do not leave diesel soaked rags in the
boat when you have finished - they are a
fire hazard. Take them out and dispose of
them properly.
9 Test run the engines (see section 7-5).