Wont start on petrol on lpg works fine - 1971 Toyota Landcruiser

I assume this is dual fuel.... LPG and gasoline??????? Is cooling system full? If so, probably plugged filter on LPG convertor. If you are not knowledgeable with LPG, get someone who is. LPG is highly explosive.

what sort of car?

the fact that it runs on fuel means that the electronics of the vehicle are all operational. The problem is the fuel selection process for he LPG. The converter for the lpg is prone to corrosion and failures internally so I would suggest that you have an accredited Auito gas specialist look at the gas system

the fuel gauge works on a float in the petrol tank and wont work on gas . the system will have to be changed to work on pressure .

the fuel contoller may have blocked or failed. have you ever replaced the lpg filters?
take your vehicle to a garage who can repair and test lpg.
this will be far cheaper than guessing.
Roger

Hi dave hill, not really sure on your problem but I have a VN commodore that I purchased that had the fuel pump crook and did the same thing of not starting on petrol. Owner said to hold in lpg button when starting . I got the fuel pump replaced. Mechanic said it was caused by not running petrol through enough and running always on LPG.

As u say could be many things as cause.but if lpg tank is full but not switching over from petrol to lpg it’s some kind of electrical problem like a relay or valve.check for lpg car specialists on net or Internet forum where the complete details of the problem can be reviewed

i have a dealers manual somewhere and i put it somewhere safe and i cannot find it ,typical but if its converted right it should start on lpg with no problem without starting on petrol but it all depends on the type of conversion and who fitted it i suppose .I have a 4.0 litre version and what a tool its just so impressive only wish i could get a few more weddings to do in to help pay the road tax here in spain

check the crank sensor or the cam sensor behind the pully,s to make sure there plugged in.

are there any fuses to check why my car wont start on gas...?