Fuel System; Fuel Tank Position; Fuel Line; Fuel Valve Installation - Honda GX240 Technical Manual

GX240 • GX270 • GX340 • GX390 (UT2/RT2) Technical Manual
F S
UEL YSTEM
If the engine is supplied with an incomplete fuel system (no fuel tank, no fuel hose, etc.), the OEM is responsible for
ensuring evaporative emission requirements/regulations are met, including certification.

Fuel Tank Position

If a remote fuel tank is used, it must be installed so that its maximum gasoline level is within 50 cm (19.5 in) above the
carburetor gasoline level. If a fuel pump is used, the maximum fuel level should be within 50 cm (19.5 in) above or
below the carburetor gasoline level.

Fuel Line

Use a low permeation fuel line (displaying an Executive Order number) rated for use with gasoline. The fuel line should
have an inside dimension of 5.5 mm (0.22 in). Keep the fuel line as short as possible. Install the fuel line so it will not
rest against any sharp objects or make sharp bends that can restrict the flow of fuel. If the fuel line passes through an
enclosure wall, protect the line with a rubber grommet. Route the fuel line away from hot engine and exhaust system
components and away from electrical wiring. Secure the fuel line to prevent sagging and bending.

Fuel Valve Installation

If a remote fuel tank is used, a fuel valve should be installed so it is easily accessible. Install the fuel valve at the outlet
of the fuel tank and use an easily read label to indicate valve location and operation. If under the fuel tank is not the
ideal location, securely install the fuel valve in-line with the fuel tube in a cool location, so that engine heat cannot
cause vapor lock.

Fuel Pump

A fuel pump should be selected that provides a maximum operating pressure of 0.1 kgf/cm (1.4 psi) and delivers 15
2
liters/hr (4.0 US gal/hr). If a secondary fuel pump is used, to prevent carburetor flooding, its operating pressure must
not exceed the standard fuel pump's operating pressure.

Fuel Tank Filter Installation

It is recommended that a fuel tank strainer with a mesh rating of #80 be installed at the fuel tank inlet to catch debris
when refueling. It is also recommended that a fuel tank sump be provided at the fuel tank outlet to reduce the chance of
contaminants entering the fuel system.
C
ONTROLS

Engine Switch

Use a three-position engine switch with continuity between its terminals as shown.
Wire Color
EXT+ EXT – ST BAT
(Red) (Black) (Black/White) (White)
Switch Position
OFF
ON
START
7
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