Here’s what I found about the fuel tank of the Volkswagen Polo 1.6 (commonly referred to as the ''H-spec'' in markets like Malaysia):

Fuel Tank Capacity

• For petrol-powered Polo 1.6 models (e.g., hatchbacks with manual or auto transmissions), the fuel tank capacity is typically 45 litres. This is confirmed by sources such as:
  
• ZigWheels specifying 45 L for the Polo 1.6 L Comfortline  .
• encyCARpedia listing 45 L for the Mk4 (2006–2010) 1.6 16-valve variant  .
• cararac.com giving 45 L for a 1.6 L saloon (mid-1990s variant)  .
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• Some diesel versions (1.6 TDI) have slightly different capacities:
  
• Auto-Data and Agricool note 45 L for Polo V 1.6 TDI (90 hp)  .
• Agricool suggests that certain Polo VI 1.6 TDI (95 hp or 80 hp) models might have a 40 L fuel tank  . But since you asked specifically about the ''H spec'' 1.6 — likely a petrol variant — 45 L is the typical answer.
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Description & Context

• Capacity: A 45 L fuel tank offers a balance between sufficient driving range and compact vehicle design.
• Model Variation: Diesel versions (especially later generations) sometimes had smaller tanks (around 40 L), but for petrol models like the Polo 1.6 Hatch / Comfortline, the 45 L tank is standard.
• Design Details: The fuel tank is usually located beneath the rear floor, and modern tanks include components like breather/vent hoses, gravity valves, and charcoal canisters for vapor recovery. While I found illustrative schematics (see image below), the focus here is on capacity .