Engine Fuel Tank

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The fuel tank on the Briggs and Stratton engine is a hollow metal container that houses the liquid fuel for use by the engine. The fuel tank must serve a myriad of purposes including:

-Providing the engine with a constant, steady fuel source (provided in our case by a pump extending from the carburetor).

-Venting to prevent extremely high pressure from accumulating. This must be done in conjunction with providing a leak-free storage environment for the fuel.

-Filling the tank with fuel.

How it works

The fuel tank is a relatively self explanatory part of the Briggs and Stratton engine. It is mounted beneath the carburetor, and a pump stemming from the carburetor that extracts fuel extends into the fuel tank. A fuel cap located on one of the upper corners of the tank covers up the hole through which more fuel can be added. The cap contains several valves that relieve excess pressure, often the result of a build-up of gasoline vapors. The pump from the carburetor is controlled exclusively by the carburetor and, although located within the realm of the fuel tank, is not directly controlled by the fuel tank. The gas tank is mounted to the engine via a bracket that attaches to the outside of the engine block.


1860- The first gas-fired internal combustion engine meant for large-scale production is invented by John Joseph Etienne Lenoir. The coal fuel used to run the engine is stored in a rubber bladder.

1909- The Ford Model T, one of the first mass-produced automobiles, implements a 10 gallon fuel tank that is mounted to the chassis behind the front seat.

1956- Packard introduces the first automobile with central power locking. Today, most automobiles' central locking controls the filler flap, a metal piece which covers the fuel tank in automobiles.

1990- General Motors faces a lawsuit regarding its decision to place the fuel tanks on many pickup trucks outside of the frame. This so-called side saddle design results in a $100 million fine.

1990's- Buell Motorcycle Company and several less notable motorcycle manufacturers begin constructing sport bikes that implement a fuel tank in which the fuel is dispersed throughout the frame of the bike in order to better distribute weight and give the motorcycle more stability by lowering the center of mass.


Fuel tanks

Lenoir's Internal Combustion Engine

Ford Model T


General Motors Lawsuit


3D parts

Subassembly Bill of Materials
Part Name # Req'd Function Mfg Process Material CAD File Image
Fuel Tank (Top Half) 1 Container for holding gasoline Machined Aluminum Fuel Tank Top
Tank top.JPG
Fuel Tank (Bottom Half) 1 Container for holding gasoline Machined Aluminum Fuel Tank Bottom
Tank bottom.JPG
Gas Cap 1 Caps the fuel tank Machined Plastic, aluminum Gas Cap
Gas cap.jpg
Mounting Bracket 1 Allows the fuel tank to be mounted on the engine Machined Aluminum Mounting Bracket
Tank bracket.jpg
Mounting Bolt 1 Secures fuel tank to block Machined Brass Mounting Bolt
Tank bolt.jpg
Gasket 1 Creates a seal between fuel tank and carburetor N/A Rubber Gasket
Tank gasket.jpg
Bowl 1 Contains fuel to be sent to carburetor Machined Aluminum Bowl
Tank bowl.jpg
Fuel Tank Assembly 1 To provide fuel necessary to run the engine Welding Aluminum, Plastic, Rubber Fuel Tank Assembly
Tank assem.jpg

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