just putting on front breaks

I was deiving along and stopped at a light and the van died and wouldn't restart. I changed the fuel filter and drove it around the block and parked it and haven been able to get the van to start or even trun over. I was told that it is the fuel pump, it is located in the fuel tank and before I go to the trouble and expense of removing the tank I would like to knoe if this is the problem. I do knoe that i have an electrical problem because if I park it for more than two days I have to charge the battery, could it be electrical?