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.

2001 GMC C3500 HD 6.5 F, AutomaticFACTORY OEM SERVICE PROCEDURE

Removal Procedure

Remove the fuel tank filler cap.

CAUTION: Refer to Battery Disconnect Caution in Cautions and Notices.

Disconnect the negative battery cables.
Raise the vehicle on a hoist. Refer to Lifting And Jacking The Vehicle in General Information.
Remove the fuel tank. Refer to Fuel Tank Replacement (Extended Cab Side Tank) or Fuel Tank Replacement (Cab and Chassis Rear Tank) or Fuel Tank Replacement (Cab and Chassis Side Tank) .

Fig 1: Fuel Sender Unit Cam Lock

Courtesy of GENERAL MOTORS CORP.

Remove the sender unit by turning the cam lock counterclockwise using the J 36608 fuel sender tool. See Special Tools .

Fig 2: Fuel Sender Assembly & Seal Ring

Courtesy of GENERAL MOTORS CORP.

Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready Tools Compare Repair Quote Quote Shield Pro

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.