Fuel Tank: Description and Operation

FUEL TANK
The fuel tanks of all Chrysler Motors built vehicles are equipped with fuel and vapor controls that allow the vehicle to pass a full 360° rollover without fuel leakage.

Both Front Wheel Drive and All Wheel Drive fuel delivery systems contain a fuel tank pressure relief rollover valve. The valve is mounted on the filler tube. The valve functions as a pressure relief valve while the vehicle is upright, but contains a check valve that prevents fuel from escaping from the fuel tank when the vehicle is turned over.

The fuel filler cap also acts as a pressure vacuum valve. When air pressure inside the fuel tank gets too high or too low, the fuel filler cap opens to relieve the difference in pressure.

An evaporation control system restricts fuel evaporation into the atmosphere and reduces unburned hydrocarbons. Vapors from the fuel tank are collected in a charcoal filled canister. The vapors are held in the canister until the engine is operating. When the engine is running, the vapors are drawn through the intake manifold into the combustion chambers.

Hoses
The hoses used on fuel injected models are of a special type and only hoses marked EFI/EFM may be used as replacements.

Fittings and Clamps
There are two ways that the fuel lines are attached to various fuel system components.

^ The first way is with a rolled edge type clamp (the purpose of the rolled edge is to prevent the clamp from cutting the fuel hoses).

Quick Connect Fuel Fitting Assembly:

^ The second type of fitting is called a Quick-Connect fuel fitting. These fittings consist of internal O-rings, a metal locking retainer, and a plastic release collar to disconnect the fitting from the fuel tube.

No-Lead Filler Tube
All catalyst equipped models have a special filler tube. The filler tube also contains a deflector to prevent the addition of fuel by other than an unleaded fuel nozzle. "Unleaded Fuel Only" Labels are attached at the instrument panel and near the fuel door, to remind the operator.

Pressure/Vacuum Filler Cap
The loss of liquid fuel or vapor is prevented by using a filler cap which releases under 10.9 to 13.45 kPa (1.58 to 1.95 psi). Only caps with these specifications may be used as replacements to maintain the integrity of the fuel system.