LPG systems NEED servicing, the faults I tend to see are caused by long overdue services.

Injectors on multipoint kits do not like dirt, some can be cleaned but usually once they fail they are fooked.

Regulators again can get a large build up of dirt and oils which with some units can cause them to overpressure etc..

Like your petrol or diesel engine they just need a bit of looking after, I've done 50k on LPG and had no problems whatsoever, sticking to service intervals and getting the calibration reset is all I've had to do.

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