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2)
Check the fuel filter frequently, and replace it with a new filter if it's dirty.
OPTIMA XD
1. Close the Fuel filter shut off valve..
2. Pull the fuel hoses away from the fuel filter.
3. Install a new fuel filter in reverse order of disassembly.
4. Open the Fuel filter shut off valve. (Most Important Step!)
Be careful with the filter installation direction. (See above image)
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CAUTION
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You must keep the valve opened during machine operation.
If you damage the machine with this issue, it will not be covered under warranty.