Bi-fuel cutout
I asked the same question back in January. I have a Volvo V70 2006 CNG.
The LPG and CNG gas systems are almost identical except the LPG system has a condenser to turn the liquified gas into a gas where as the CNG system has a regulator. The LPG is not as clean as CNG and can clog up the condenser and distributor particularly if no inline filter is installed.
To cut a long story short I bought a new distributor and stepper motor. The car now doesn't work at all on gas......
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