F 250 2WD Pickup V8-5.4L CNG VIN M (1999)
Fuel Gauge Module (CNG): Description and Operation
WARNING
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DO NOT MODIFY THE SYSTEM CONFIGURATION OR COMPONENTS OR REPLACE COMPONENTS WITH PARTS NOT
SPECIALLY DESIGNED FOR USE WITH NATURAL GAS. FORD MOTOR COMPANY HAS SPECIALLY DESIGNED THE
MATERIALS, COMPONENTS AND SYSTEM CONFIGURATION FOR THE 5.4L F250 NATURAL GAS VEHICLE, AND EACH
PARTICULAR SYSTEM IS PRECISELY CALIBRATED FOR EFFICIENT OPERATION. THE USE OF DIFFERENT PARTS OR
MATERIALS CAN PRODUCE AN UNTESTED CONFIGURATION THAT COULD RESULT IN FIRE OR PERSONAL INJURY OR
CAUSE ENGINE DAMAGE.
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IT IS IMPORTANT THAT YOUR NATURAL GAS VEHICLE BE CORRECTLY MAINTAINED BY FORD NATURAL GAS
TRAINED PERSONNEL. IF A CONCERN OCCURS, IT IS IMPORTANT THAT CORRECTLY TRAINED PERSONNEL
DIAGNOSE THE CAUSE. IF THE PROBLEM RELATES TO THE FUEL SYSTEM, PROPER PART REPLACEMENT IS
IMPERATIVE TO KEEP YOUR VEHICLE OPERATING AT NORMAL PERFORMANCE. NATURAL GAS COMPONENTS AND
GASOLINE FUEL COMPONENTS ARE NOT INTERCHANGEABLE. IF YOUR VEHICLE IS NOT REPAIRED IN ACCORDANCE
WITH NATURAL GAS-FUELED VEHICLE PROCEDURES, DAMAGE CAN OCCUR AND YOUR WARRANTY MAY BE
INVALIDATED.
NOTE: All standard production components and systems receive routine repairs under base warranty procedures
Natural Gas Vehicle (NGV) Module
The Natural Gas Vehicle (NGV) module assembly:
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consists of a 60-pin module, a bracket, a marine cover and four marine cover retainers.
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houses the unique electronics required for natural gas fuel systems.
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is located on the center radiator support, behind the radiator grille.
The NGV module carries out the following functions:
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injector drivers: the NGV module accepts eight unmodified injector signals from the Powertrain Control Module (PCM) and allows a
peak-and-sustain current to flow through the injector solenoids.
NOTE: No injector calculations are carried out; the injector driver output is not determined by the NGV module.
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fuel gauge driver: the NGV module uses tank temperature and fuel tank pressure inputs to calculate the density of the fuel; a look-up table is
used to determine the output signal to the fuel gauge.
