Rampage L4-135 2.2L (1983)
Technical Service Bulletin # 182486
Date: 861101
Fuel System - Vapor Lock/ Fuel Foaming
Models
1981 Through 1987 Omni/Horizon/ Charger/Turismo, Scamp & Rampage Vehicles (Includes Shelby & G.L.H. Models) Equipped With a 2.2L
Carbureted Engine
Subject
Vapor Lock/ Fuel Foaming
Index
DRIVEABILITY
Date
November 24, 1986
No.
18-24-86 REVISION A
P-4239
This bulletin supersedes Technical Service Bulletins:
^
14-48-84 for subject vehicles equipped with 2.2L engine.
^
18-24-86, which should be removed from your files.
^
18-24-86 SUPPLEMENT A, which should be removed from your files.
The model year application has been expanded to include 1981 through 1987 vehicles, as indicated in Technical Service Bulletin 18-24-86
SUPPLEMENT A, and to include later-built 1987 vehicles with a pressure regulator located near the carburetor fuel inlet.
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
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
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Occurs after hot soak, prolonged idle, or highway speeds at any throttle opening.
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Sag due to lean mixture.
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No black smoke at tailpipe.
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Fuel pressure drops to 0.
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Carburetor air horn dry.
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No accelerator pump discharge
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May not start until engine cools.
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Engine may not sustain heavy loads.
Fuel Foaming
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Occurs primarily after hot soak restart or prolonged idle only on medium to heavy acceleration.
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Sag due to rich fuel mixture.
^
Black smoke at tailpipe.
^
Fuel pressure is normal.
