Series 60 – Low Power – HIGH FUEL PRESSURE

To determine if high fuel pressure is causing lack of power, perform the following steps:
1. Remove the Supply Fuel Temperature Sensor (SFT Sensor) fitting from the fuel pump.
see Figure 12-3 for SFT Sensor.

2. Attach a calibrated gauge capable of reading 0-517 kPa (0-75 psi) to the fuel pump.

3. Start and run the engine to the speeds listed in Table 12-3 and record the fuel pressure:

NOTE:
When checking fuel pressure, start the engine, run at the speeds listed in Table 12-3,
and record fuel pressure. Shut down the engine.

4. Shut down the engine.
5. Remove the calibrated gauge from the fuel pump.
6. Reinstall the SFT Sensor, refer to the Series 60 Service manual (6SE2007), fuel system
chapter.
7. Analyze the measured fuel pressure readings.
[a] If the fuel pressure is within specification listed in Table 12-3, check for high fuel
temperature return; refer to section 12.5.
[b] If the fuel pressure is greater than specifications listed in Table 12-3, refer to section
12.4.1.

12.4.1
Fuel Pressure Regulator Replacement
Perform the following steps to replace the fuel regulator:
1. Remove the fuel pressure regulator; refer to appropriate service manual, fuel system chapter.
2. Install a new fuel pressure regulator; refer to appropriate service manual, fuel system chapter.
3. Verify new fuel pressure regulator replacement; refer to section 12.4.1.1.

12.4.1.1
Test the Engine with Replaced Fuel Pressure Regulator
Perform the following steps to determine if the replaced fuel pressure regulator resolved lack
of power condition:
1. Start and run the engine.
2. Run the engine at idle with a no-load for approximately 5 minutes, allowing the engine coolant to reach normal operating range.
3. Test drive the vehicle to ensure lack of power has been resolved.
[a] If no lack of power occurred during the test drive, no further troubleshooting is required. Shut down the engine.
[b] If lack of power occurred during the test drive, shut down the engine. Check for high fuel temperature return; refer to section 12.5.

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