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Gas oil in tank but boiler doesn't work?

My boiler isn't firing up but there's approx 13 inches of gasoil in the tank!! It's been considerably lower than this before and boiler worked ok and I had hot water. Please advise if I need to purchase more gas oil (before I go mad at my landlord, as he says problem is I need to get more gas oil!!)
Thanking you in advance.
Upset mother of 3., January 2011