Bedienungsanleitung Navman Diesel Fuel Flow Sensors (Seite 23 von 39) (Englisch)

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Diesel fuel flow sensor kit Installation and Operation Manual

NAVMAN

This section discusses fuel pipes terminology

and the fittings and tape used to join the pipes.

7-2-1 Pipe

Diesel fuel lines are often solid copper pipe.

Copper pipes are rated by their diameter:

Usually fuel lines will be called by their

outside diameter (OD) - this is also typical

of refrigeration pipe fittings.

However, domestic copper water pipe

is commonly measured by its inside

diameter (ID).

So ½ inch refrigeration pipe is a different size

from ½ inch water pipe - make sure you know

what size your boat fuel piping is before you

purchase fittings to install the sensors.

7-2-2 Flare Nuts

Flare nuts are often used to connect a sensor to

a solid copper fuel line. There are two different

systems of flare fittings:

45 degree flare: 45 degree fittings are

more common, and are in standard use

for refrigeration pipe work.

37½ degree flare: 37½ degree fittings

are more common for hydraulic systems.

JIC fittings are 37½ degree flare.

Fitting flare nuts

Push the flare nut along the pipe before

flaring the pipe!! Then flare the end of

the pipe using the flaring tool. Inspect the

inside face of the flared pipe - it must be

smooth and scratch-free. If it is not, cut it

off and try again.

7-2-3 Flexible Hoses.

Flexible hoses can make installation a lot

easier, but modern recommendations are that

only one short length of flexible hose should be

used - on the final link from the pipework fixed

to the boat to the engine, to allow for flexing

and vibration.

In many countries a boat licensed to carry

paying passengers has stringent codes of

installation practice to comply with - frequently

these require fixed, rigid fuel piping until the

last section. If your boat has to meet such

inspections, then check carefully before

attempting to use flexible hoses. At the very

least you may have to use metal braided flexible

hose to meet fire regulations.

There are also recommendations that the

fittings on the end of the flexible hose should

be professionally hydraulically crimped on.

Failing that, there are recommendations on

specific forms of field fitted hose fittings. Check

the use of flexible hoses against Coast Guard

recommendations, ABYC guidelines or with a

marine surveyor before deciding to use flexible

hose on your boat.

7-2-5 Threadseal tape or paste

Threadseal tape or paste is needed for all joints

where thread to thread sealing is required, for

example the adaptor fitting threads that are

screwed to the diesel fuel flow sensor.

Some manufacturers say to never use tape,

only use paste, while others say tape is OK.

Follow any requirements given by the engine

or boat manufacturer. The one thing you must

guard against with either type of threadseal is

bits of the thread sealer breaking off and getting

into the fuel.

Warning: Make sure pieces of the

threadseal tape or paste can not break off

and enter the fuel pipe.

7-2 Notes on pipes, fittings and installation

Only use fittings with the same flare in

your system. Do not mix fittings with

different flares.

If you don’t know how to use a flare

tool, then don’t fit a fuel flow sensor at

your first attempt. Ask to be shown how

to use the tool, then practice on some

scrap pipe before working on the pipes

on your boat!.

Warnings for flare nuts

Here are some comments and reminders:

Mark the pipe where you wish to cut it,

then cut it using a pipe cutter.

Do not cut the pipe with a hack saw - it

will leave small metal particles in the

pipes that will harm the sensor and other

items in the fuel line.

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Navman Diesel Fuel Flow Sensors Seite 23

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