caps do work. the thing with them is that you use a 1 farrad cap(for example, im just tossing out a number) for around 800 watt. usually 1 is enough to cover you 600-1000 watt. if you start getting into higher level amps like 2,3 4 or more thousand watt, youll have to get a 15 farrad cap, which is huge and really expensive. the caps do store a charge like a battery, they release it faster though. i am not sure how much charge can stored in a cap. a cap is only usefull for a short drain, then it need sto fill back up. using a cap for a fuel pump which will have a constant drain on power is useless. caps arent for that, caps are there to even out the current in case of drops, like when an amp hits. a battery is used for providing steady current. some use batteries instead of caps, but you will need more than one usually to help out with the current drop because batteries dont discharge as fast as a cap. in your case ur not going to have drops in current, so you want a nice steady source, which is a battery. like i said, get urself a nice bike battery, theyre small enough to be out of the way and hold enough charge to help the fuel pump. just make sure you vent it, otherwise you will run into problems with dangrous vapors leaking into the interior, you dont want that.

I just wish my car was as fast as it was loud. people tell me i should use my sub to push it, it might go faster.