Use the electric pump for a fishing weight and go back to the mechanical pump, or install a GOOD fuel pressure regulator that can maintain a 3-4 PSI maximum pressure at all times. Your pump is overpowering the needle valve at idle and causing the engine to flood and stall. I hope you wired the electric pump with an oil pressure switch in series with it, at least.
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!