What liquid fuel can be used in camping equipment.?

It really depends on the stove and the fuel delivery system. Some stoves use propane canisters, while others use isobutane canisters, and others use a variety of liquid fuels. Since you said "pump type", I will ume that it does not use pressurized canisters, but some type of liquid fuel instead. Many stoves will run a variety of fuels, but may be difficult to light, keep lit, be inefficient, or gum up and stop working without constant cleaning. You could try kerosene or unleaded gasoline, but white gas is another possibility.