Skytrak 6042 Service Manual User Manual download pdf (Page 214)

Engine: Cummins 4BT3.9

7.20

Model 6042 Legacy Origin 7/02

7.8.3 Fuel Level Sender and Gauge

The fuel level sender and gauge assembly is described in

Section 9.15.14, “Fuel Level Indicator and Fuel Level

Sender.”

7.8.4 Fuel Lift Pump Inspection and Testing

1. Inspect the camshaft lever and return spring for

excessive wear.

2. Test the diaphragm, remove the fuel inlet line

(Fig. 7-20, 1) from the fuel lift pump (2). Block the

fuel inlet with a finger and operate the hand plunger

(3). A properly operating pump will provide suction

that will remain until the finger is removed from the

inlet.

Figure 7-20 Testing a Typical Fuel Lift Pump

a. Fuel Lift Pump Removal

1. Disconnect the negative (-) battery cable from the

battery.

2. Clean debris from around the lift pump (Fig. 7-20, 2).

3. Disconnect the fuel inlet line (Fig. 7-20, 1).

4. Remove the capscrews (Fig. 7-20, 5), gasket, and

fuel lift pump (2).

b. Cleaning and Drying

Clean the exterior of the pump with mineral spirits, and

blow dry with compressed air.

Note: Parts replacement is not practical. The fuel lift

pump is serviced as an entire assembly.

c. Fuel Lift Pump Installation

1. Clean the mounting surface on the cylinder block.

2. Install the fuel lift pump (Fig. 7-20, 2) with a new gasket.

Install and torque the capscrews (5) to 18 lb-ft (24 Nm).

3. Connect the fuel line (Fig. 7-20, 1). Vent air from fuel

system. Refer to the appropriate owners/operators

manual.

4. Connect the negative (-) battery cable (Fig. 7-2, 1).

7.8.5 Fuel Filter

Refer to the appropriate owners/operators manual for the

proper procedure for removing and replacing the fuel filter

(Fig. 7-20, 4).

7.8.6 Venting Air from the Fuel System

Refer to the appropriate owners/operators manual for the

proper procedure for venting air from the fuel system.

7.8.7 Fuel Injectors

The engine uses Bosch 17 mm closed nozzle hole-type

injectors. The injectors have different part numbers for

different engine ratings. The last four digits of the

Cummins part number (stamped on the bottom portion of

the injector) identify the injector.

IMPORTANT: Use only the specified injector for the engine.

Damage to engine can occur if incorrect injectors are used.

During the injection cycle, high pressure from the

injection pump rises to the operating (or “pop”) pressure,

which causes the needle valve in the injector to lift. Fuel

is then injected into the cylinder. A shimmed spring is

used to force the needle valve closed as the injection

pressure drops below the pop pressure to seal off the

nozzle after injection.

Failure of the needle valve to lift and to close at the

correct time, or a needle valve that is stuck open, can

cause the engine to misfire and produce low power. Fuel

leaking from the open nozzle can cause a fuel knock,

poor performance, smoke, poor fuel economy and rough

running.

MT2530

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Skytrak 6042 Service Manual User Manual Page 214

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