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.
1997 GMC C3500 HD 6.5 F, StandardFACTORY OEM SERVICE PROCEDURE
Component Locations
COMPONENT LOCATIONS
| Component | Location |
|---|---|
| Balance Fuel Pump | On Inside Left Frame Rail, Near Front Of Rear Tank |
| Balance Fuel Pump Relay | On Balance Fuel Pump |
| Crankshaft Position (CKP) Sensor | Lower Left Front Of Timing Chain Cover |
| Data Link Connector (DLC) | Under Left Side Of Instrument Panel |
| EGR Control Pressure/Baro Sensor | On Bulkhead, Right Of Steering Column |
| EGR Solenoid | Left Rear Top Of Engine, Above Valve Cover |
| Electronic Fuel Injection Pump | Top Of Engine Near ECT Sensor |
| Engine Coolant Temperature (ECT) Sensor | Lower Front Of Engine |
| Fuel Pump Oil Pressure Switch | Under Intake Manifold, Center Of Engine |
| Fuel Pump Prime Connector | At Instrument Panel Harness, Near Fuse/Relay Center Breakout |
| Fuel Pump Relay | In Underhood Fuse/Relay Center |
| Glow Plug Relay | Left Rear Of Engine Near Bulkhead |
| Intake Air Temperature (IAT) Sensor | On Air Intake Duct |
| Mass Airflow (MAF) Sensor | On Air Intake Duct |
| Powertrain Control Module (PCM) | Under Right Side Of Instrument Panel, Above Blower Motor |
| Underhood Fuse/Relay Center | Left Rear Of Engine Compartment, On Wheelwell |
| Wastegate Solenoid | Left Rear Top Of Engine, Above Valve Cover |
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.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.