⚠️ Chevrolet manufacturer position
GM truck fuel service often requires tank lowering—consult GMSI for cab/bed/tank combination. Wrong fuel excluded from warranty.
Vehicle information
| Make | Chevrolet |
|---|---|
| Model | Silverado 1500 |
| Market status | Sold new in the US 1999–present (Silverado 1500) |
| Body styles | Full-size pickup truck |
| Generations | GMT K2XX, T1XX (2019–present light duty) |
| Engine options | Gasoline: 5.3L V8, 6.2L V8, 2.7L turbo four-cylinder (model year dependent) Diesel: 3.0L Duramax inline-six (where equipped) Electric: Silverado EV (separate—no fuel tank) |
| Fuel tank capacity | 24–26 gal typical (varies with bed/tank option) |
| Fuel system | Gasoline injection or Duramax common-rail diesel with DEF |
| Access method | Tank drop or OEM truck tank access—varies by configuration |
| Anti-siphon | Yes |
| Service portal | GM Service Information (GMSI) / ACDelco TDS |
Misfuel risk High
Light-duty Silverado with Duramax diesel is a primary US gasoline-in-diesel misfuel risk at travel centers.
If the engine was not started
Do not start Duramax if gasoline was added; avoid cycling key-on fuel pump.
If the engine was started
Expect HP fuel system component inspection on diesel; gasoline trucks need filter and pump evaluation.
Access procedure
- Depressurize the fuel system per GM service information; disconnect battery negative.
- Access fuel module via under-seat/trunk panel or perform tank lowering if required for the platform.
- Disconnect electrical connector and fuel line fittings; use line plugs as specified.
- Remove lock ring and lift module; extract wrong fuel with approved recovery equipment.
- Inspect tank and lines; replace filters if contamination reached the engine supply circuit.
- Reinstall module with new seal; verify connections and perform leak check.
- Prime system and clear DTCs per GMSI before returning vehicle to service.
Notes
- Confirm 1500 versus HD (2500/3500) powertrain before procedures.
Related models
- GMC Sierra 1500
Frequently asked questions
How do I know if my Silverado is diesel?
Check the fuel door label, badging (Duramax), and window sticker. Diesel uses the green/yellow handled truck lane at many stations.
Does DEF go in the fuel tank?
No. DEF has a separate blue-capped port. If DEF enters the fuel tank, follow GM contamination procedures—do not start.
Need professional misfuel recovery?
Find a certified operator or read consumer guidance for your next steps.
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