It shouldn't unless the battery connections were dirty or left loose.
It's recommended to do when you are replacing the timing belt.
I think it's about 3-4 hours.
front. no. just be careful not to disturb it.
You do not need to, but it's highly recommended. If water pump fails after you change the belt, you will have to do the same work as before to replace the pump.
Answering "How do you replace the water pump on a 1994 Toyota Camry?"
If you only took of the parts you needed to to get at the water pump then no. When replacing the water pump you do not need to get far enough into the engine to do anything with the timing.
You need a water pump and water pump gasket (sometimes it comes with water pump but not always). It's a good idea to get to replace crankshaft, camshaft and oil pump seals. Also if money allows replace the timing belt spring and its tensioneer.
You have to do the same what you do when replacing the timing belt. But you will need also to remove the timing belt gears and completely to remove the timing belt protection cover. After that you will able to replace the water pump. New user to program says "this some bulls*it"
The 1989 Toyota Camry water pump is located on the front of the engine. You can follow the top radiator hose directly to the water pump.
no
There are couple choices. First one is heater radiator hose (usually with coolant not water). Second one is the hose of the condenser (is responsible to collect water vapor and take it out of the cabin). Second one is the most often, and can be fixed by replacing the hose or fixing it with epoxy.
how do you install a water pump on a 1992 toyota camry