propane fuel vaporizes at normal barometric pressure at temperatures above -42°C (-44°F), and expands
to 270 times its volume as a liquid. Unnecessary venting of propane fuel can create fire and health
hazards which could cause personal injury or death.
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Be alert for situations that may cause the propane fuel system to vent fuel. These include extremely hot
days, parking near a space heater, or hoisting a vehicle up near a ceiling heater. Release of propane fuel in
a confined area through the pressure relief valve could occur. The release of propane fuel in a confined
area could result in an accumulation of flammable vapors. If fuel is vented near a heat source, a fire or
explosion could occur.
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Do not use paint drying ovens for propane fueled vehicles. The heat of paint drying ovens will increase
the pressure in the fuel tanks. This could cause venting of propane fuel vapor into the oven and result in a
fire from the heat or sparks in the electrical equipment. If the fuel is confined inside an oven an explosion
may occur. When refinishing the body panels of a propane fueled vehicle use spot painting and drying
methods.
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If a confined area, such as a lubrication pit, has been subjected to propane gas the area should be
inspected for adequate oxygen levels by a local health department before being entered or personal injury
or death may occur.
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The fuel system pressure must be relieved before any component can be removed. The fuel tanks must be
evacuated prior to tank removal. Removal of components without pressure relief or tank evacuation can
cause propane fuel to escape into the air and cause injury or death.
DRIVE CYCLES
OBD-II BI-FUEL DRIVE CYCLE DESCRIPTION
OBD-II drive cycle is a pattern of driving in which the PCM will execute all OBD-II diagnostic monitors. Drive
cycle is used to detect first time faults, so that a DTC will be stored in compuvalve memory. When the same
fault is detected in two consecutive trips or if fault is emission related, compuvalve uses the trip information to
decide on whether to illuminate the Malfunction Indicator Light (MIL) will illuminate.
MIL will go off when the fault condition no longer exists or the vehicle is driven 2 miles with no fault. MIL will
also go off if the vehicle switches automatically to GAS mode. DTC will be stored in compuvalve memory until
vehicle has completed 40 drive cycles without repeat of fault.
OBD-II BI-FUEL DRIVE CYCLE
A drive cycle trip is defined as a key on, key off event in which PCM detects the following:
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Engine coolant temperature should exceed 158°F (70°C).
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Engine coolant temperature should change more than 68°F (20°C) after starting engine.
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Engine speed should exceed 400 RPM.
NOTE:
Rough road conditions may prevent certain steady state conditions and steady
accelerations from validating the transmission and load related monitors. On
models with Power Take-Off (PTO), disengage PTO system before performing
drive cycle.
2003 Ford Pickup F150
2003 ENGINE PERFORMANCE Self-Diagnostics - Bi-Fuel - Gasoline/LPG