[rons49]

No fuel pump in As, therefore no vapor lock. The problem is IMO, the fuel line can get hot, and Mylar will reflect the heat away. However, the issue is the float bowl boils the fuel & the A will fuel starve. Heat can be transferred from the exhaust pipe to the air maze to the carb. In addition side valvers have the fuel entering the system( carb) right at the hottest spot... the exhaust manifold. Without engine pans heat resonates from the road surface and adds to the issue. With 0 fuel pump pressure gas will boil sooner. #2, these "vapor lock" issues always pop up in the spring. This, of course, is when the weather gets warm and there is all that WINTER gas still in the tank. Recommend, that the winter fuel be drained and new fresh summer fuel be added. Put the old stuff in your newer vehicle that pushes @25 psi into the injectors. Radiators work the same way ... boiling temp rises with pressure @ 3 degrees per lb of psi. Ron