GAS ADAPTERS (COMBINATION GAS
-
GASOLINE)
Engines having standard gasoline carburetors are modified to also use gaseous fuels thru the
addition of a gas adapter plus
-
the necessary gas pressure regulatory equipment. The gas adapter is
installed on
the air intake side of the carburetor.
The adapter consists of a
venturi and gas jet
-
arrangement with an external main fuel (load) adjustment and usually an idle fuel adjustment. See
Figure 12
-
2 (K482) and Figure 12-1: (K662) for initial settings. The combination system must also
include fuel shut
-
off valves in both gas and gasoline lines to facilitate switching from one fuel to the
other.
Gas Operation:
Before switching from gasoline to gas, disconnect the automatic choke lead wire on
engines equipped with electric choke. Tape end of lead wire to prevent grounding then proceed as
follows:
1. Close gasoline shut
-
off valve (usually located on fuel filter).
Open gas valve in gas fuel
line.
2.
Depress gas primer (if so equipped) then start engine.
Use Step
3
if final adjustments are
needed.
3.
Allow engine to warm up to normal operating temperatures. Move throttle control to
normal operating speed and
place engine under load.
Loosen locknut then move load adjust
-
ment in until engine. starts to slow down from lean mixture then back out on adjustment past
the point where engine speed picks up then slows down again from
overrich mixture
--
lock
adjustment at point halfway between
overrich and lean settings.
If
engine runs unsteady at
no load,
idle speeds, move idle adjustment screw in or out to attain smoothest idle.
Gasoline Operation: Reconnect electric choke lead (when used) then shut off gas valve and open gaso
-
line valve. If engine is so equipped, qrime gasoline system with priming lever on fuel pump. See
Gasoline Carburetor in Section
4
if adjustment is needed.
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