Letting of steam

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My car was pumping out steam like Puffin' Billy this morning. OK it was 0.2º and stopped at the traffic lights the steam enveloped the car. I notice other LPG cars steam a lot more than petrol cars. Anyway, my real point is I think I've cooked my fuel pump by being a dumb-*** and letting the petrol tank go to empty 'cos of the prices I just get gas, stuff petrol! I put in $15 of juice and when I switch to petrol– no go! I have been told this is a thing that can happen the fuel pump, located in the tank apparently will burn out? Sheez, how do you fix that!!!???? Is there a way to test it is really a screwed pump? BTW its a 3.9MPFI.