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Navman Diesel Fuel Flow Sensors Manual

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Diesel fuel flow sensor kit Installation and Operation Manual
27
NAVMAN
The fuel line to the engine needs to be
connected to the outlet of the sensor. If
the fuel line is solid copper, a flare joint
is probably easiest to install (see section
6-3). Note that if the flaring fails you will
need to cut the flare off the copper pipe
- this can be a problem if the fuel line is
straight or the line can not be shuffled
along in its retaining clamps.
b In a solid fuel line (supply or return
sensor)
See section 7-4-1. This is usually the easiest
option to find fittings for.
The sensor can be located anywhere along the
pipe, which might make mounting easier.
You will need to cut the pipe and will usually fit
flare joints. This method does require using a
flaring tool, and possibly a pipe bender.
c At the junction of the solid pipe and
the flexible hose leading to the engine
(supply or return sensor)
This can be the best option because there is
less potential to strain the sensor fittings.
If possible, fit the sensor inlet to the existing
fitting on the solid fuel line and fit the sensor
outlet to the flexible fuel line. This requires
space for the sensor. You must obtain the exact
fittings to match those on the end of the pipe.
Another option is to cut the solid fuel line line
and connect the sensor using a flare joint.
In all cases, the sensor must be mounted solidly
to the boat. Get a fitting to adapt the sensor
outlet to flexible fuel line.
d After the lift pump (supply sensor
only)
If the engine is very sensitive to pressure drop in
the fuel line, then it may be necessary to install
the supply line flow sensor after the lift pump.
The Navman diesel flow sensor has a very low
pressure drop across it at moderate flow rates
(see appendix A). If your engine has particularly
high flow rates in the fuel lines, and if it can not
tolerate any pressure drop in the line before the
lift pump (on the suction side of the lift pump),
then it might be necessary to install the flow
sensor in the fuel line after the lift pump.
This is often more difficult than the other
options, because the lift pump is usually
mounted on the engine and the fuel line from
the lift pump to the injector body is steel tube.
However, being after the lift pump does get rid
of any of the problems of pressure drop across
the sensor.
If the sensor is mounted on the engine, then
the high temperature and vibration can affect
the accuracy of the sensor. It is better to
mount the sensor on the boat and connect it
with two flexible fuel lines if your requirements
allow this.
e On the return inlet of the fuel tank (return
sensor only)
Install the sensor before any existing fittings on
the fuel tank. This might be the best option if
the fuel line is all flexible. Note:
You have to recognise and obtain the
correct fitting to match the fitting on the
inlet of the tank.
The diesel flow sensor has a female
thread. Connection to a tank with a
female thread inlet, will require two
fittings, a male to free rotating female and
a male to male.
Ensure there is little strain on the sensor
or the tank. When using solid fittings, the
sensor mounting block must be made
accurately and the sensor positioned
accurately. If the installation requirements
allow, use a short length of flexible fuel
hose between the sensor outlet and the
tank.
The return fuel line needs to be
connected to the inlet of the sensor. If
the fuel line is solid copper, a flare joint
is probably easiest to install (see section
6-3). Note that if the flaring fails you will
need to cut the flare off the copper pipe
- this can be a problem if the fuel line is
straight or the line can not be shuffled
along in its retaining clamps.
… 27 …


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Others manual(s) of Navman Diesel Fuel Flow Sensors

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

Navman Diesel Fuel Flow Sensors User Manual - Dutch - 32 pages


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