The 1999 Toyota Tacoma has a fuel tank capacity of 21.1 US gallons (79.5 liters) for Regular Cab models, and 18.5 US gallons (70 liters) for Double Cab and Extended Cab 4WD models.
Gallons:
- Regular Cab: 21.1 gallons
- Double Cab 4WD and Extended Cab 4WD: 18.5 gallons
