Volvo Owners Club Forum - View Single Post - Oddly, my factory Bi-fuel still burns Petrol

CNGBiFuel · Jun 30th, 2013, 01:13

I consider myself very fortunate to have a Bifuel car. After sorting its initial gripes, it now runs great, and I keep the distributor slider well lubed (never use silicon, Lambdas don't like it) and clean the distributor often. Stepper motors on these are a weak point, so I keep it spotless.

Only one issue really. it still uses petrol. very odd. I don't ever select petrol (why would i?) OK, I realise it msut use some petrol to warm-up.. and it flicks to gas after 150-200 yds from cold, so can't be doing more than 2-3 miles a month on petrol. However, I reckon it burns 2 gallons of petrol for every 4-500 miles I drive, which is more than the warm-up mileage, so it must also be burning petrol when running gas. But why? Is this right?

Do the LPG cars have the same issue? (My CNG car is identical to the factory LPG cars at the business end,)

Can i ask, do the factory Necam LPG cars burn some petrol too, even when LPG is selected?

Jun 30th, 2013, 01:13	#1
CNGBiFuel Classic P80 1999 BiFuel Last Online: Mar 6th, 2024 00:34 Join Date: Aug 2012 Location: 48mph Middle Lane M4	Oddly, my factory Bi-fuel still burns Petrol I consider myself very fortunate to have a Bifuel car. After sorting its initial gripes, it now runs great, and I keep the distributor slider well lubed (never use silicon, Lambdas don't like it) and clean the distributor often. Stepper motors on these are a weak point, so I keep it spotless. Only one issue really. it still uses petrol. very odd. I don't ever select petrol (why would i?) OK, I realise it msut use some petrol to warm-up.. and it flicks to gas after 150-200 yds from cold, so can't be doing more than 2-3 miles a month on petrol. However, I reckon it burns 2 gallons of petrol for every 4-500 miles I drive, which is more than the warm-up mileage, so it must also be burning petrol when running gas. But why? Is this right? Do the LPG cars have the same issue? (My CNG car is identical to the factory LPG cars at the business end,) Can i ask, do the factory Necam LPG cars burn some petrol too, even when LPG is selected? __________________ Bifuel V70 Classic 1999 [The Old Grumpy in the Corner, "When I was a lad... blah, bl**dy blah."]