How the Fuel System Works on 1984 Suzuki Three-Wheeler


Suzuki's ALT 50 was a three-wheel ATV produced from 1983 to 1987. It came standard with a 49-cubic-centimeter air-cooled two-stroke gasoline engine and single-speed drive.

Fuel Tank And Pump

  • Fuel from the tank, located beneath the seat, is supplied to the engine by a vacuum fuel pump mounted on the tank shield just in front of the fuel tank. A hose from the pump to the manifold supplies vacuum to operate the pump.

Fuel Filter

  • A strainer-type fuel filter is located inside the fuel tank outlet. Servicing the fuel filter requires removal of the fuel tank.

Fuel Petcock

  • The ALT 50 has a two-position vacuum-operated fuel petcock installed on the fuel tank outlet. The two petcock settings are "Prime" and "On." When the petcock is in the "Prime" position, fuel flows continuously to the carburetor; in the "On" position, fuel flows only if the engine is running and vacuum is present at the petcock. A single fuel line runs from the petcock to the carburetor.


  • The Mikumi VM12SC carburetor is mounted on top of the engine case, immediately behind the cylinder head. Adjustment screws on the side of the carburetor body allow setting idle speed and air/fuel mixture. A manually operated priming pump is installed on the side of the float chamber, with a spring-loaded button to prime the carburetor with extra fuel for easier starting after periods of storage.

Starting System

  • Instead of a standard choke, the VM12SC utilizes a bypass-type enrichener starting system to supply additional fuel to the engine for cold-weather starts.

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  • Haynes Inc: Suzuki ATV's, Three And Four Wheelers Owner's Workshop Manual: Kurt Choate: 1985, 1986
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