Just use an angle grinder with a thin cutoff disc on it to slice the lever arm off flush with the pump body. Unless the rubber diaphragm has a hole in it, nothing else needs to be done. The check valves can stay put, since the electric pump will overcome the slight resistance to flow they provide and they will prevent fuel from backing up to the tank when the electric pump shuts off.
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!