Compac CNG Service Manual page 46

Scheduled Servicing
Checking the Isolation Ball Valve Sealing and Operation
Checking the Three Way Refuelling Valve Sealing and Operation
Check the Sealing of the Three-Way
Refuelling Valve
Check the Operation of the Three-Way
Refuelling Valve
Draining the Coalescing Filter
Compac Industries Ltd.
Before you start, make sure you have:
 Soapy water
To check the operation of the isolation ball valve:
1. Close the isolation valve.
2. Open the dispenser access door.
3. Open the bleed valve on the utility manifold block (where fitted) and
bleed the gas from the refuelling hose.
4. Close the bleed valve once the hose is degassed.
5. Start a fill.
If the pressure gauge starts to move, the isolation ball valve is leaking
or passing gas.
6. Apply soapy water to the valve.
If bubbles form, there is a leak in the assembly or fitting. The fitting may
require tightening or the seals might need to be replaced.
Before you start, make sure you have:
 Soapy water
To check the sealing of the three-way refuelling valve, apply soapy water
to the valve.
If bubbles form, there is a leak, in which case you should replace the
three-way refuelling valve seals. (see page 55)
To check the operation of the three-way refuelling valve, do a test fill to
check that the valve is filling the vehicle, and venting properly when you
disconnect it from the vehicle.
If bubbles form, there is a leak, in which case you should replace the
three-way refuelling valve seals. (see page 55)
Before you start, make sure you have:
 a 3/16" hex key
To drain the coalescing filter:
1. De-gas the dispenser (see page 40).
2. Open the dispenser access doors.
3. Unscrew the drain plug from the bottom of the filter cover.
4. Allow all oil and water to drain from the filter.
If excessive amounts of oil and water are present, remove and replace
the coalescing filters (see page 47).
5. Screw in the drain plug and repeat steps 1 to 4 for all additional filters.
Page 46
Servicing
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