Use an oil pressure sensing switch to run the pump. If the engine stalls and the oil pressure drops, the pump shuts off to prevent a possible flooding situation. You can use a pressure regulator if necessary to give the carb the proper fuel line pressure, although most electric pumps that aren't designed for racing should be in the ballpark without a regulator. The pressure switch used on General Motors fuel injected vehicles combines an idiot light ground with a normally-open 2-contact switch for powering a fuel pump.

http://deden-menenen.rhcloud.com/airtex-os75-oil-pressure-switch/B0027I8CU8.html

Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!