s40 bi fuel wont switch to lpg
hi every one so I have just bought a s40 bi fuel 51 plate i have done about 300 miles on lpg since owning the car with no problems but today i was going up a very step hill so i turned the car to petrol to get up the hill i then turned the car back to lpg at which point the lpg fuel gauge went from 3/4 full to empty and switched to petrol on its own so i went to the petrol station and put 10 pound of gas in to see if it was a faulty gauge but the needle did not move and still will not switch to lpg any ideas what the problem could be thanks
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