How big is the gas tank on a Grand Am GT?
The Grand Am GT typically uses a 15-gallon gas tank (about 57 liters). This figure is common for late-1980s Grand Am GT models, though exact capacity can vary by year and engine.
The question spans model years, trims, and small variations introduced during Pontiac's production of the Grand Am GT. Tank size is influenced by the chassis and engine configuration, and some production runs included slightly different capacities. Below is a concise guide to what owners and manuals report for this model line.
Typical tank size across generations
Below is a concise summary of the capacity you can expect across the Grand Am GT lineup. Note that exact values can vary by year and market, so use these as guidance and verify on your specific vehicle.
- Common capacity: about 15 gallons (57 liters) for most late-1980s Grand Am GTs.
- Variations: some early- or late-model variants may show a rough range around 12–16 gallons (46–61 liters) depending on engine and options.
In practice, the typical figure most owners report is around 15 gallons, with some variations. Always verify with the data plate or owner's manual for your exact car.
How to verify for your Grand Am GT
Check the vehicle data plate
Look at the label on the driver's door jamb or the fuel cap area for official capacity figures as installed on your car. The data plate is the most reliable source for exact gallons and liters.
Consult the owner’s manual or service data
Owner manuals or factory service data sheets list tank capacity by model year and engine. When in doubt, cross-check with GM's service literature or database catalogs online.
Summary
In short, the Grand Am GT is typically equipped with a 15-gallon fuel tank, with occasional year-to-year variations that can slightly adjust this figure. For precise capacity, reference the car’s data plate or owner's manual. The takeaway for owners and prospective buyers is to rely on the official specification printed on the vehicle and consult manuals for exact figures by year and trim.
