Westerbeke 21A Installationshandbuch PDF herunterladen (Seite 31)

This shutoff valve is necessary to guard against the possibil-

ity of gasoline siphoning through the supply line to the car-

buretor and into the engine in case the carburetor float valve

doesn’t close, the carburetor needle valve doesn’t operate

properly, or the fuel line ruptures between the engine and the

fuel tank at a point below the fuel level. The shut-off valve

can be installed at the tank withdrawal fitting, or at a location

where the line from the fuel tank will no longer remain

above the fuel tank top level. It can be electrically operated

automatically (with manual override) to open when the

engine starts and close when it shuts down. A manually oper-

ated valve can also be used, operated either from the

Start/Stop panel area or from the vessel’s deck. The shut-off

valve should be of the fuel oil type, and it is important that

all joints be free of pressure leaks.

NOTE: The use of mechanical spring-type check valves

instead of a solenoid shut-off valve is not recommended since

these may tax the fuel lift pump’s ability to draw fuel through

a check valve. A check valve can trap debris under its seat

which inhibits the valve’s ability to close. In addition, if a

check valve’s cracking pressure is too high, it can contribute

to vapor lock. Should a mechanical-type spring-loaded check

valve be used, it should be an adjustable type, such as a

Weatherhead #43 x 6. This adjustable type valve should be

adjusted to have a cracking pressure that will prevent

siphoning when the engine or generator is not operating but

not so excessive as to prevent the fuel lift pump from drawing

fuel through the valve.

Fuel Tanks Located

Below

the Engine/Generator

An installation having a fuel tank located below the engine or

generator’s fuel system, with the fuel supply line to the car-

buretor routed above the level of the fuel tank’s top, does not

require an anti-siphon shut-off valve, but does require two

manually-operated service shut-off valves — one located at

the fuel connection to the tank, and another located at the

fuel connection to the engine/generator.

GASOLINE ENGINE/FUEL TANKS

FUEL TANKS/ FUEL SYSTEM

DIESEL FUEL SYSTEM ANTI-SIPHON DEVICES

Fuel system anti-siphon devices should not be used with a

diesel engine/generator. It is not necessary and, in addition,

introduces air into the fuel which may cause erratic operation.

The fuel system should include one or more fuel shutoff

valves.

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