TP-5393 9/933-10 Scheduled Maintenance
LP Carburetor Adjustments
Main Fuel Mixture
For preliminary setting turn the MAIN FUEL valve in a
clockwise direction until it bottoms lightly (do not force),
then back out 1 turn. With the engine thoroughly
warmedupand runningatratedrpmunderfullload,turn
MAIN FUEL valve in until the engine slows down (lean
setting) then turn valve out until the engine regains full
speed (about 1/8 turn). When properly adjusted, the
engine will operate with steady governor action.
Improper adjustment (rich setting) causes improper
operationofthevaporizerandexcessfuelconsumption.
Idle Fuel Mixture
The idle system functions only at part- and no-load
conditions. For this reason, the idle setting has only a
momentary effect. To adjust, stop the engine and then
turntheIDLEFUELscrewallthewayin(clockwise)then
back out 1/4 turn. Adjust for proper no load operation.
1-917
2
3
4
1
1. Fuel Valve
2. Fuel Filter
3. Main Fuel Adjustment
4. Idle Fuel Adjustment
Figure 3-12. LP Gas Carburetor Adjustments and
LP Gas Fuel Valve Assembly
Fuel Valve and Filter—LP Liquid
The LP fuel valve contains a replaceable filter which
should be inspected yearly or after every 100 hours of
operation. Normally,the filterrequiresreplacementonly
after accumulation of filtered debris restricts fuel flow to
the regulator/vaporizer. Rough generator operation
and/or the presence of frost on the fuel valve outer
surface indicates filter replacement is necessary.
AssemblyoftheLPgasfuelvalveandlocationofthefuel
filter is shown in Figure 3-12.
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