If your going to mod it, I'd get a fass or airdog and be done with it.

Like mentioned, you need to turn the key to start for a split second for the pump to kick on.

68 Road Runner, 69 Belvedere, 71 Challenger Vert
340 barracuda, 01 Ram CTD, 95 Ram, 04 Ram, 85 Daytona turbo Z
66 GTO, 06 Magnum RT AWD. 07 Ram CTD, 07 Ram