Induction & Fuel Systems Mr. Lombardi

Induction The term “induction” applies to the pathway for fuel and air to enter the combustion chamber. Including: – Fuel Storage, Filters, Lines, & Pumps – Carburetion – Fuel Injection – Manifolds

The fuel system must supply an exact amount of fuel for the engine to burn. Without this essential system, a car wouldn’t be able to run. The Purpose of A Fuel System

Basic Parts of A Fuel System Air Cleaner Fuel Tank Fuel Line Fuel Inj/Carb Fuel Pump Fuel Filter Air Filter

Fuel Tank Usually two pieces of steel, welded together to form a container Can also be made of plastic. It will have a fuel pickup in the deepest part Filler neck Vent to allow air back in Gauge Fuel pump

Fuel Filter Screens out dirt and rust particles from the fuel, normally made into cartridges containing a filter paper.

Fuel Lines A fuel line is a hose used to bring fuel from storage tank to the distribution center. (Carb/Injectors) Commonly made of steel or high density plastic.

Fuel Pump Fuel has to be pumped from the fuel tank to the engine under low pressure to the carburetor or high pressure to the fuel injection system.

Fuel Delivery Carburetor Fuel Injection

Carburetors Rely on the Venturi Vacuum principle Rated in CFM 3 Common Styles – 1 Barrel – 2 Barrel – 4 Barrel (square bore/spread bore)

Venturi Vacuum

1 Barrel (200 – 400 CFM)

2 Barrel (350 – 500 CFM)

4 Barrel (400 – 1150 CFM)

Square Bore Vs. Spread Bore

Fuel Injection Atomizes the fuel by forcibly pumping it through a small nozzle – Throttle Body Injection – 15 psi – Port Fuel Injection – 90 psi – Gasoline Direct Injection – 3,000 psi – Diesel Direst Injection – 30,000 psi

First Fuel Injection Adams Farwell Originally adopted for diesel engines.

Typical Injector

Throttle Body Injection 1 or 2 Injectors for engine

Port Fuel Injection An injector per cylinder aimed at the port opening.

Diesel Fuel Injection Fuel injection “Timing” is critical

Direct Injection Similar to Diesel, An injector per cylinder spraying directly inside each cylinder.

Intake Manifold “Wet” for Carbureted applications “Dry” for Injected applications Older manifolds were made from Cast Iron Modern manifolds are made from Aluminum Future manifolds will almost always be made of plastic (vinyl, phenolic resin, etc.)

Carbureted Intake Manifold

Injected Intake Manifold