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VAUX OMEGA DUAL FUEL FACTORY FITTED - FUEL - GERS

MY OMEGA KEEPS SWITCHONG BACK TO PETROL A COUPLE OF MINUTESAFTER SWITCHING TO GAS

VAUX OMEGA DUAL FUEL FACTORY FITTED - FUEL - injection doc
could be many reasons but the gas pumps do wear out and may be the poressure is too low.
it would need a competent tech to take a look