Mini Ram Van L4-134 2.2L SOHC VIN C 2-BBL (1987)
Technical Service Bulletin # 180786
Date: 860301
Fuel System - Vapor Lock/ Fuel Foaming
Models
1986 Caravan, Ram Van & Voyager Vehicles Equipped With 2.2L Carbureted Engine
Subject
Vapor Lock/ Fuel Foaming
Index
DRIVEABILITY
Date
March 24, 1986
No.
18-07-86
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.
^
May not start until engine cools.
^
Engine may not sustain heavy loads.
Revised part numbers, TSB 18-37-86, pages 2, 4, 7, and 8, December 8, 1986
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).
PARTS REQUIRED
ORDER ONE OF THE FOLLOWING TWO PACKAGE PART NUMBERS:
With 15 Gallon Fuel Tank
PN 4419418*
