Bedienungsanleitung Navman Diesel Fuel Flow Sensors (Seite 27 von 39) (Englisch)

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Diesel fuel flow sensor kit Installation and Operation Manual

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.

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