Bedienungsanleitung Navman Diesel Fuel Flow Sensors (Seite 26 von 39) (Englisch)

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Diesel fuel flow sensor kit Installation and Operation Manual

NAVMAN

7-3-3 Locating the sensors in the

fuel lines

The supply sensor will be installed in the fuel

supply line between the the primary fuel filter

and the engine fuel intake. The return sensor

will be installed in the fuel return line between

the engine fuel return and the fuel tank. There

are several options where to locate each

sensor, discussed below, and the best option

will depend on the layout of your engine’s fuel

system and what fittings are used. Because

there is so much variation in fuel systems, this

can only be a guide to where the sensor should

be located. If in doubt, consult a qualified diesel

engineer.

Locating the supply sensor

Before planning where to install the sensor,

identify the supply line of the fuel system:

Find the primary filter - this will be in the

fuel line coming from the fuel tank, before

the lines reach the engine. To meet

modern recommendations these lines will

probably be of metal tubing, not flexible

hose. The primary filter is typically large

and has a clear sightglass and water and

sediment separation bowl. It should be

fixed firmly to the structure of the boat.

Find the outlet of the primary filter

- this should be labelled on the filter.

Sometimes there is a one-way or

non-return valve fitting on the outlet also.

Identify the fuel supply line from the

primary filter to the engine. A solid fuel

line usually has a flexible portion joining it

to the engine.

There are four options of locating the supply

sensor in the supply line:

1 On the outlet of the primary filter (see a

below).

2 In the solid fuel line between the primary

filter and the engine (see b below).

3 At the junction of the solid pipe and the

flexible hose leading to the engine (see c

below).

4 After the lift pump (see d below).

Locating the return sensor

Before planning where to install the sensor,

identify the return line of the fuel system. This

return line will most probably start from the

injector body on the engine, have a flexible

section to take account of engine movement,

then return to the tank in solid wall pipe.

There are three options of locating the return

sensor in the return line:

1 At the junction of the solid pipe and the

flexible hose leading from the engine (see

c below).

2 In the solid fuel line between the engine

and the tank (see b below).

3 On the return inlet of the fuel tank (see e

below).

Sensor mounting positions

This section discusses issues relating to the

different mounting positions for supply or

return sensors.

a On the outlet of the primary filter

(supply sensor only)

Install the sensor after any one-way or non-

return valve fitting on the outlet of the filter.

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

outlet of the filter.

The diesel flow sensor has a female

thread. Connection to a filter with a

female thread outlet, 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 filter. 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 filter outlet and the

sensor.

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