Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD1999MUSTANG GT, 2D CONVERTIBLE, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)EXTERNAL PAGESDIFFERENT CARSECTION 81 (ENGINE CONTROLS - REMOVAL, OVERHAUL & INSTALLATION - ECONOLINE - NGV)FUEL SYSTEMSFUEL SYSTEM PRECAUTIONS (CNG)
1999 Ford Mustang GT, 2D Convertible, Standard
Fuel System Precautions (CNG)
1999 Ford Mustang GT, 2D Convertible, StandardSECTION Fuel System Precautions (CNG)
WARNING: This page is about a different car, the 2002 Ford Econoline and 2002 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
- Do not modify the system configuration or components, or replace components with components not specifically designed for use with natural gas. Ford Motor Company has specifically designed the materials, components and system configuration for this vehicle, and each particular system is precisely calibrated for efficient operation. The use of different parts or materials can produce an untested configuration that can result in fire or personal injury or cause engine damage.
- Fuel supply lines are always pressurized. When servicing fuel-related components, do not smoke or carry lighted tobacco or an open flame of any type. Flammable mixtures may be present and can ignite, resulting in personal injury.
- The natural gas fuel system is always pressurized to 95 psi (655 kPa) downstream of the fuel pressure regulator and up to 3600 psi (24,821 kPa) upstream of the fuel pressure regulator. Use care when servicing the fuel system or personal injury can occur.
- The natural gas fuel supply manifold is pressurized to 95 psi (655 kPa). Fuel pressure must be relieved prior to any fuel system service.
- 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 natural gas to escape into the air and cause injury or death. Observe all fuel system precautions on any fuel system repair.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.