precautions while using cng

The high pressure filter is located in the FMM and is plumbed between the manifold and the solenoid valve. The high pressure filter purifies the fuel by removing moisture and contaminants.
The high pressure filter element has an efficiency rating of 1 micron. It should be changed with every oil change or once every 3000 miles, whichever occurs first.
When re assembling the HP filter, apply a silicone based spray lubricant on the filter bowl threads. DO NOT allow the lube to contaminate the filter or O rings.

The low pressure coalescing filters is usually located near the engine. The low pressure filter removes residual contaminants and oil from the fuel before it enters the engine. Consult the engine manufacturer for maintenance and replacement guidelines.

1. Ensure that the vehicle is turned off.
2. Turn all cylinder shutoff valves one on each cylinder clockwise to the OFF CLOSED position.
3. Ensure that the manual shut off valve is in the ON OPEN position.
4. Turn on the vehicle and run the engine until it stops.
5. Ensure that the vehicle is off and that the proper vehicle lock out procedures are followed. Remove the ignition key.
6. Check the gauges on the fill panel to ensure that all the pressure is relieved.
7. Remove the access cover on the rear of the fill panel optional.
8. Relieve the remaining pressure by slowly opening the bleed valve as shown below.

Fittings and connections should be checked periodically for leaks. This task must be carried out by qualified personnel. For monthly maintenance, the entire fuel system can be leak tested with leak detection solution, and or a methane detector. All joints and connections should be tested. Leaks usually occur at fitting connections. When checking for leaks always use certified leak detecting equipment and solutions designed for use with stainless steel and brass such as Snoop? or FBI?.
1. Apply a certified leak detecting solution and look for bubbling or foaming.
2. Examine connections for icing or signs of condensation around the tubing.
3. Check for signs of damaged or perforated tubing.

Perform leak repairs in the order shown below. Note Move on to the next repair only if the previous repair did not fix the leak.

1. Depressurize the system.
2. Drain the filter.
3. Unscrew the filter bowl by using a filter bowl removal tool or open end wrench.
4. Remove and replace the old filter element.
5. Inspect the O ring on the filter element holder for damage and replace if necessary.
6. Lubricate the filter bowl threads with a silicone lubricant. DO NOT allow lube to contaminate the bowl or filter element.
7. Reinstall the bowl and tighten to 40 ?1 ft lbs.

The third method returns fuel to a distribution system. When using this process, pressure in the vehicle cylinder and the supply system pressure will equalize, so some pressure may remain in the vehicle fuel system.

In this defueling method, a compressor at the fueling station extracts the gas from vehicle.

The following section covers a variety of potential problems and their respective solutions. The issues addressed in this section are unique to CNG storage systems; however issues concerning other onboard systems may influence or directly cause problems with the CNG storage system.

Smoke or strike a match
Operate any electrical switches or appliance controls,
Pull an plugs from outlets
Use a flashlight or lighter
Use a telephone or cell phone from the building