Ford V8 flathead vapor lock

[Keith Webb]

These vehicles must have been designed to run under these conditions when new, so what has changed?

I think one of the main problems I have come across is the fuel pump, and in particular wear in the actuating rod which transmits the energy from the camshaft to the pump... Old "bushies" here talk about the threepenny solution where a thruppence coin was put under the pushrod to restore clearance to make the pump effective. This rod can wear quite a lot in service. Another solution is to add some length to the rod with a bit of weld added to the bottom of the rod.