You won’t be able to run anything bigger than around 2.1 gpm off the accessory outlet in your vehicle. The bigger pumps pull too many amps and will blow a fuse.
Also, a standard vehicle battery is not meant to be run down like that. You’ll damage it to the point that it will no longer take a charge. You can swap the regular battery for a deep cycle marine, but it’s not recommended. I do it, though.
