Century L4-151 2.5L (1989)
splashing back out of the filler neck.
FUEL TANK FILLER CAP
The fuel tank filler neck is equipped with a screw type cap. The threaded part of the cap requires several turns counterclockwise to remove. The long
threaded area was designed to allow any remaining fuel tank pressure to escape during the cap removal operation. A ratchet type torque limiting device
prevents over-tightening. To install, turn the cap clockwise until a clicking noise is heard. This signals that the correct torque has been reached and the
cap is fully seated.
NOTE: If a fuel filler cap requires replacement, only a cap with the same features should be used. Failure to use the correct cap can result in a serious
malfunction of the system.
FUEL AND VAPOR PIPES
The fuel feed and return pipes extend from the fuel pump/gauge sending unit to the engine compartment. The pipes are secured to the underbody with
clip and screw assemblies. Both fuel feed pipes and return pipe must be properly routed and retained, and should be inspected occasionally for leaks,
kinks, or dents. If evidence of dirt is found in the fuel injector assembly or fuel filter during disassembly, the pipes should be disconnected and blown
out. Check the fuel strainer on the fuel pump/fuel gauge assembly for damage or omission.
The vapor pipe extends from the fuel pump/gauge assembly to the canister. However, it may not follow the same route as the fuel feed pipe.
Due to the fact that the fuel pipes/hoses are under high pressure on fuel injected systems these systems require special consideration for service.
NYLON FUEL LINES
Nylon fuel lines are designed to perform the same function as the steel or rubber fuel lines they are replacing. The use of nylon fuel lines eliminates the
'knocking' noise that sometimes accompanied engine warm-up when metal lines were used. Nylon lines are made to withstand maximum fuel line
pressure, exposure to fuel additives, and changes in weather. There are two sizes used: 3/8" ID for the fuel feed and 5/16" ID for the fuel return. The fuel
feed and return lines are assembled and serviced as an assembly. Quick connect type fittings are used at the ends of the fuel feed/return lines and at the
in-line fuel filter.
Lines are soft and flexible prior to installation in a vehicle. When filled with gasoline for 72 hours, the lines will harden. Nylon fuel lines are somewhat
flexible and can be formed around gradual turns under the vehicle. Nylon lines, if forced into sharp bends, will kink and restrict fuel flow. Special care
should be taken when working with nylon fuel lines. Nylon fuel lines cannot be repaired and can only be replaced with the proper part number
replacement.
QUICK CONNECT FITTINGS
Quick connect type fittings provide a simplified means of installing and connecting fuel system components. Two types of quick disconnect fittings are
used at various parts of the fuel system. O-rings, located inside the female socket provide the fuel seal. One type quick disconnect fitting uses hand
releasable locking tabs. The other type of quick disconnect fitting has a locking tab that requires the use of a special tool.
Nylon Fuel Line Tool
FUEL LINE O-RINGS
