Rampage L4-135 2.2L (1983)
Technical Service Bulletin # 180486
Date: 860201
Fuel System - Vapor Lock/Fuel Foaming
Models
1983-1985 Aries/Reliant; 1983 LeBaron/Dodge 400/600/E-Class/New Yorker; and 1984 LeBaron/Dodge 400 Equipped With 2.2L Carbureted Engine
Note:
Additional vehicles mentioned at the end of this bulletin
Subject
Vapor Lock/Fuel Foaming
Index
DRIVEABILITY
Date
February 10, 1986
No.
18-04-86
P-341-C
This bulletin supersedes Technical Service Bulletin # 18-03-85, which should be removed from your files.
The revisions in this bulletin include:
1.
Fuel hoses PN 4279877 and 4279874 and roll over valve PN 4185254 added to kits PN 4342916 and 4342917.
2.
The wiring diagram is corrected to show the proper wire positions in the 8-way natural colored connector.
Symptom/Condition, Diagnosis & Parts Information
SYMPTOM/CONDITION
Vapor Lock - Engine performance is gradually reduced in high ambient temperature or high altitude driving due to a drop in fuel pressure, which starves
the engine for fuel (goes lean). Engine may not start until fuel system components cool off.
Fuel Foaming - Engine sags and/or exhibits poor performance following a hot soak restart. This condition occurs when cool incoming fuel meets the hot
fuel in the carburetor fuel bowl, which creates an over rich condition. Engine will start (unloading technique may be necessary).
DIAGNOSIS
Vapor lock and fuel foaming cause similar conditions. The following are characteristics of each condition and should be observed on a fully warmed up
engine. (These conditions do not affect cold engine driveability.)
Vapor Lock
^
Occurs after hot soak, prolonged idle, or highway speeds at any throttle opening.
^
Sag due to lean mixture.
^
No black smoke at tailpipe.
^
Fuel pressure drops to 0.
^
Carburetor air horn dry.
^
No accelerator pump discharge.
^
Max not start until engine cools.
^
Engine may not sustain heavy loads.
Fuel Foaming
^
Occurs primarily after hot soak restart or prolonged idle only on medium to heavy acceleration.
^
Sag due to rich fuel mixture.
^
Black smoke at tailpipe.
^
Fuel pressure is normal.
^
Raw fuel at carburetor air horn.
^
Good accelerator pump discharge.
^
Will start immediately (unloading technique may be necessary).
