55.2-59 starter spins sometimes

[la hi]

My 454ci starter started to spin sometimes instead of catching? This just started this week after the engine overheated. I installed an Edelbrock 38gpm electric fuel pump to relieve the vapor lock conditions and then the starter problem popped up.

What could it be?

PS: Installing the pump close to the underbed tank and routing the fuel line up the firewall to the carb works for me. Now it starts at first crank and no more priming the carb (Edelbrock 1407).