Sylvie Willis
EEC, or Electronic Emission Control, is a system used to control HC emissions by collecting fuel vapours from the fuel tank and carburettor fuel bowl vents, and directing them into an engine intake manifold. The EEC system was first introduced in 1970 in California due to the state's stringent emission laws, and was used in all cars across the United States from 1971 onwards. The EEC system is not to be confused with the EVAPORATIVE EMISSION system, which is not electronic and was introduced in 1970. EEC fuel tanks are the same size as non-EEC tanks, but have extra ports for tubing and equipment.
| Characteristics | Values |
|---|---|
| Full Form | EEC = Electronic Emission Control |
| Year of Introduction | 1970 |
| Usage | Used to collect fuel vapors from the fuel tank and carburetor fuel bowl vents |
| Redirects Vapors To | Charcoal canister |
| Usage of Charcoal Canister | To be routed to the intake to allow the fumes to be burnt in the engine when running |
| Usage of Air Pumps | To inject air into the exhaust |
| Function | Not needed from a functional standpoint |
| Usage | Required in states or countries that require SMOG regulations |
| EEC and Non-EEC Tank Dimensions | Same |
| Difference | EEC version has extra ports to attach EEC tubing and equipment |
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What You'll Learn
EEC fuel tanks are used for Electronic Emission Control
The EEC system is designed to control HC emissions by collecting fuel vapours from the fuel tank and carburettor fuel bowl vents, and directing them into an engine intake manifold. This process helps to reduce harmful emissions released into the atmosphere. The fuel vapours are either stored in the engine crankcase or in a charcoal-filled canister until they can be fed into the engine intake system when the engine is running, where they are burned.
EEC fuel tanks are typically distinguished by a hole in the top of the tank, which connects to a fuel line that runs along the right-side frame rail to a canister in the engine bay. This hole is used to attach the EEC tubing and equipment. The fuel tank filler caps on EEC systems also differ from those on non-EEC systems, as they often feature built-in pressure-vacuum relief to prevent vacuum lock due to fuel expansion or contraction.
It is important to note that the EVAPORATIVE EMISSION system is not the same as the EEC system. The EVAPORATIVE EMISSION system does not use an onboard computer, unlike the EEC system. Additionally, the fuel tanks used with the EVAPORATIVE EMISSION system are different from those used with the EEC system.
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They are also used for Evaporative Emission Control
The Evaporative Emission Control (EEC) system is a method of controlling HC emissions by collecting fuel vapours from the fuel tank and carburettor fuel bowl vents, and directing them into an engine intake manifold. The EEC system was first introduced in 1970 in California due to the state's stringent emission laws. In 1971, EEC systems were required and installed on all cars across the United States.
The EEC system works by collecting fuel vapours from the fuel tank and carburettor bowl vents, which are then redirected into a charcoal canister. This canister is then routed to the intake to allow the fumes to be burnt in the engine when it is running. The charcoal canister traps and stores the fuel vapours until the engine is warm and the vehicle is in motion. At this point, a purge valve opens, allowing the vapours to be siphoned from the canister into the intake manifold, where they are burned in the engine.
The EEC system is designed to prevent gasoline vapours from escaping into the atmosphere from the fuel tank and fuel system. It seals off the fuel system from the atmosphere, preventing uncontrolled evaporative emissions, which can account for a significant portion of the pollution produced by a motor vehicle.
The fuel tank filler caps used on cars with EEC systems differ from those on cars without EEC. The caps on EEC systems often have built-in pressure-vacuum relief to prevent a vacuum lock caused by fuel expansion or contraction. Additionally, EEC fuel tanks may have extra ports to attach the EEC tubing and equipment.
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EEC fuel tanks are the same size as non-EEC tanks
EEC, or Electronic Emission Control, is a system that uses an onboard computer to control HC emissions by collecting fuel vapours from the fuel tank and carburettor fuel bowl vents, and directing them into an engine intake manifold. The first EEC was introduced in 1970 on cars sold in California due to the state's stringent emission laws, and from 1971, EEC systems were required on all cars across the United States.
The EEC system is not to be confused with the EVAPORATIVE EMISSION system, which is not electronic and was also introduced in 1970. The EVAPORATIVE EMISSION system involves one or two fuel vapour valves, a charcoal canister, a crankcase filter, and a corrugated paper hose that routes from the canister to the filter.
While the EEC and non-EEC fuel tanks are the same size, the EEC version has additional ports for attaching the EEC tubing and equipment. These ports can be blocked off to use an EEC tank without the EEC equipment. The fuel tank filler caps used on cars with EEC systems also differ from those without, as most EEC caps have built-in pressure-vacuum relief to prevent vacuum lock caused by fuel expansion or contraction.
EEC fuel tanks also have an overfill limiter or temperature expansion tank, which limits the total filling of the tank. This feature is especially useful when the vehicle is parked in the hot sun after filling the tank, as it offers space for the expansion of fuel and the collection of vapour.
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They have extra ports for tubing and equipment
The EEC, or Electronic Emission Control, system was introduced in 1970 in California and was used in all cars across the United States from 1971 onwards. The system collects fuel vapours from the fuel tank and carburettor fuel bowl vents, which are then redirected into a charcoal canister. This canister is then routed to the intake to allow the fumes to be burnt in the engine when running.
EEC fuel tanks are the same size as non-EEC tanks, but they have extra ports. These ports are used to attach the EEC tubing and equipment. This tubing and equipment include the charcoal canister, crankcase filter, and assorted hoses. The charcoal canister is mounted below the windshield or washer jar, and the crankcase filter clips into the air cleaner. A corrugated paper hose connects the canister to the filter.
The EEC system also includes a liquid-vapour separator to prevent liquid fuel from reaching the engine crankcase or vapour storage canister. This separator can be contained within the tank or installed outside of it. When the separator is external, vent lines extend from the tank to the separator, allowing the tank to vent even when the car is not on a level surface.
The fuel tank filler caps used on cars with EEC systems also differ from those without. Most EEC caps have built-in pressure-vacuum relief to prevent a vacuum lock due to fuel expansion or contraction.
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EEC systems were first introduced in California in 1970
EEC stands for Electronic Emission Control or Evaporative Emission Control. EEC systems were first introduced in California in 1970 due to the state's stringent emission laws.
The EEC system is a method of controlling HC emissions by collecting fuel vapours from the fuel tank and carburettor fuel bowl vents and directing them into an engine intake manifold. The fuel vapours are stored in the engine crankcase or in a charcoal-granule-filled canister until they are fed into the engine intake system when the engine is running.
In 1970, these systems were fairly basic. The fuel vapours from the fuel tank and carburettor bowl vents were redirected into a charcoal canister, which was then routed to the intake to allow the fumes to be burnt in the engine when running. The EEC system is not the same as the EVAPORATIVE EMISSION system, which does not use an onboard computer.
The EEC system was introduced to reduce air pollution caused by vehicle emissions. By collecting and burning the fuel vapours, the system helps to reduce the amount of harmful gases released into the atmosphere. The EEC system also improves fuel efficiency by ensuring that the fuel vapours are burned and used for energy rather than released into the atmosphere.
The EEC system was first introduced on 1970 models with California emissions and was later required on all cars across the United States in 1971. The system included a charcoal canister, hoses, and a non-vented gas tank system. The fuel tank filler caps used on cars with EEC systems also differ from those used on cars without EEC systems. Most caps in EEC systems have built-in pressure-vacuum relief to prevent a vacuum lock due to fuel expansion or contraction.
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Frequently asked questions
EEC stands for Electronic Emission Control. It is a system that uses an onboard computer to control HC emissions by collecting fuel vapours from the fuel tank and carburettor fuel bowl vents, and directing them into an engine intake manifold.
An EEC and non-EEC fuel tank are the same size, but the EEC version has extra ports to attach the EEC tubing and equipment. The fuel tank filler caps also differ between the two systems.
EEC fuel tanks were introduced in 1970 due to California's stringent emission laws. In 1971, EEC systems were installed on all cars across the United States.
