[gomezoneill]

Just a thought, have you checked or replaced the fuel pump relays? I believe there's a upgrade kit for the turbo fuel pump relays.

Here it is: https://www.google.com/search?source=univ&tbm=isch&q=1977+porsche+turbo+fuel+pump++relay+upgrade+kit&client=firefox-b-1-d&sa=X&ved=2ahUKEwjakp62neftAhVFElkFHTpADOQQjJkEegQIBhAB

And there's this: https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwjakp62neftAhVFElkFHTpADOQQFjALegQICxAC&url=http%3A%2F%2Fforums.pelicanparts.com%2F911-930-turbo-super-charging-forum%2F424622-930-fuel-pump-relay-wiring-once-all.html&usg=AOvVaw3fijoEBWsK4b9U5kUoIcxX

The issue is fuse 16 gets overheated.