I have a vw sharan v6 dual fuel but will not run

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.

Because a previous owner (or the dealer) wanted the lower cost of running on LPG using a dual fuel system so petrol (gasoline) could be used too. If the work was done professionally it provides the best of both but the downside is the reduction of usable space in the load space. You will find more about this in the "articles" page at http://www.graemecooper.com.au

take it to an lpg repairer due to laws and regulations

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.

FILL IT UP FIRST ...DONT TRUST THE LIGHTS MAY BE A SELONOID GONE AND NOT LETTING THE LPG THROUGH

LPG 3Y engine toyota crown comfort automatic - fuel consupmtion is 13.30litre per 100km? How can this be reduced?

You have been given false information, in old cars that were not designed to run on unleaded fuel then yes, but your car was designed to run specifically on unleaded fuel and will run just fine and even more emmisions free on LPG gas, the only draw back to LPG is the size and location of the fuel tank required to use LPG as your exclusive source of fuel. being that it is a car you will looses storage space in your trunk area and the oter draw back depending on where you live is availability of filling staations... but absolutely no internal engine concerns.

areas to check are the fuel pressures, fuel hoses, fuel crossover solenoid
It indicates that the ECM is receiving the correct information from the sensors to adjust for LPG but when crossed over to petrol signals from sensors are not as clear as they should be
This can be from a power drain to components caused by a faulty solenoid or relay that is reducing the voltage available to the sensors ( normally in the air intake system or the heated oxygen sensor in the exhaust manifold )
check all harness connections and wiring
if you are checking it all your self then a workshop manual that has all of the voltages for each sensor would provide help

Whats the difference between petrol and gas? Dual fuel ? lpg

Check ignition timing setting for lpg and consult with lpg conversion center to install a spark timing advance processor if possible