If you guys had a previous recall done, then you already have an external fuel pump relay installed next to your fuse bob. These external relays started failing and just need to be replaced. You can use any good quality standard relay as temporary fix.
No, not to do with the fuel pump - at least not for the cooling system.
Vapor lock can be for any pipe wehere the flow is stopped due to a pocket of air. Poor bleeding or burping of the cooling system can cause overheating so it is something that has to be done correctly.
Vapor lock can also happen in fuel systems and has often been an issue with ...
The Bosch Kugelfischer (I'll use "BK" for short going forward) mechanical plunger injection pumps for petrol engines were used across a variety of makes/models of vehicles from the late 60's into the mid-80's. They were derived from the diesel pumps as you suggested. A couple of vehicles which use the BK pump was the BMW 2002Tii and 2002 Turbo. ...
Not cranking is not related to a faulty fuel pump. A faulty fuel pump may cause the engine not to start, but it won't stop the engine from cranking.
To answer your question: A fuel pump van seize/stop working for many reasons including:
Old age / wear
Bad / no electical connection
When you turn the key to the run position (or if you have a ...