Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSCHEVROLET2009TAHOE BASE, 4.8 CREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 276 (ENGINE CONTROL SYSTEM & FUEL SYSTEM - HYBRID (LZ1) - REPAIR INSTRUCTIONS)REPAIR INSTRUCTIONSFUEL PRESSURE SENSOR REPLACEMENTINSTALLATION PROCEDURE

2009 Chevrolet Tahoe Base, 4.8 C

Installation Procedure

2009 Chevrolet Tahoe Base, 4.8 CSECTION Installation Procedure

WARNING: This page is about a different car, the 2010 GMC Yukon, 2010 Chevrolet Tahoe, and 2010 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Locating Fuel Pressure Sensor & O-ring Seal

Courtesy of GENERAL MOTORS CORP.

Lubricate a NEW fuel pressure sensor O-ring seal with clean engine oil.
Install the NEW fuel pressure sensor O-ring seal (2) onto the fuel line fitting.
Wrap a shop towel around the fuel pressure sensor fitting in order to absorb any fuel that may leak out.

CAUTION: Refer to Fastener Caution .

Install the fuel pressure sensor (1) to the fuel line.
Tighten: Tighten the sensor to 15 N.m (11 lb ft).

Fig 2: View Of Chassis Wiring Harness Electrical Connector, Fuel Pressure Sensor, Fuel Pipe Bracket & Wiring Harness Clip

Courtesy of GENERAL MOTORS CORP.

Connect the chassis wiring harness electrical connector (1) to the fuel pressure sensor (2).
Lower the vehicle.
Use the following procedure in order to inspect for leaks:
1. Turn the ignition ON, with the engine OFF, for 2 seconds.
2. Turn the ignition OFF for 10 seconds.
3. Turn the ignition ON, with the engine OFF.
4. Inspect for fuel leaks.
If equipped with 4WD, install the front propeller shaft. Refer to Front Propeller Shaft Replacement .

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.