Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 587

FUEL SYSTEM 6C – 7

ANEROID COMPENSATOR

The aneroid compensator consists of the compensator housing, the bellows, the adjusting pin, the aneroid
compensator lever pin, and the aneroid compensator lever.
Atmospheric pressure decreases as altitude increases. The decreased atmospheric pressure causes the bellows to
expand and push the adjusting pin down.
The adjusting pin pushes the aneroid compensator lever pin and the aneroid compensator lever to the left.
The aneroid compensator lever pushes the tension lever to the right.
The tension lever actuates the control sleeve to decrease the fuel flow.

6C – 8 FUEL SYSTEM

BOOST COMPENSATOR

The boost compensator consists of the compensator housing, the diaphragm, the adjusting pin, the boost
compensator lever pin, and the boost compensator lever.
The increase boost pressure cause the diaphragm to lower and push the adjusting pin down.
The adjusting pin pushes the boost compensator lever pin and the boost compensator lever to the left.
The boost compensator lever pushes the tension lever to the right.
The tension lever actuates the control sleeve to increase the fuel flow.

FUEL SYSTEM 6C – 9

FAST IDLE ACTUATOR

The vacuum-type fast idle actuator increases the engine idling speed to provide the additional power required to
operate the air conditioner.
Fast idler diaphragm movement is caused by changes in the negative pressure created by the engine’s vacuum
pump.
The diaphragm motion is transferred to the injection pump control lever to increase or decrease the idling speed.

6C – 10 FUEL SYSTEM

WAX TYPE COLD START DEVICE (W–CSD) (If so equipped)

Because engine starting in cold conditions is very difficult, the W-C.S.D. (wax type cold start device) has been
developed to provide the optimum fuel injection timing for engine starting by responding to temperature changes.
The thermo-wax piston contains a wax that changes its volume according to the temperature changes of the engine
coolant which flows through the unit at all times.
The engine coolant temperature above A

°C the wax expands in proportion to the coolant temperature, below A °C

it contracts.
The coolant temperature A is classified as –20, -10 and 0

°C.