Alright fellow enthusiasts, I'm brand new to the game. Picked up a beautiful 67 coupe a week ago.

Drives absolutely beautiful... for the first 45 minutes.

Once the engine gets hot, I start to lose power, like it's starving for gas. Starts jumping and lurching. It can't be the fuel line or pump being clogged I don't think, as the car starts right up, and runs fantastic cold. The fuel filter could be clogged, but the previous owner replaced it less than 200 miles ago.

I believe I am getting vapor lock, as my fuel line is VERY close to my engine block. (See attached photos). Before I go throwing money at a new pump, filter or fuel line,




My question is: how should I go about re routing? How have you overcome this issue? '67 coupe, 289 bored 30 over with the Edelbrock top end kit. Engine was rebuilt ~400 miles ago.

 

To rule out vapor lock occurring in that fuel line, you could crush tin foil between the engine and fuel line just to see if that cures the issue. From the looks of it, I don't think that should be the problem. If it is a fuel issue associated with heat, I would lean more towards unblocked heat risers in the intake manifold. Most aluminum aftermarket manifolds have blanked heat risers, but in your third photo it appears there is a heat riser behind your blue fuel filter. If that riser is open, the exhaust gases could be boiling the gas in your carburetor. After it starts exibiting the drivability problem, check the temperature at the base of the carburetor. preferably with a touchless infrared thermometer and see if it is excessively hot.

 

Can you explain more what a heat riser is? I'm new to the game too

 

The attached YouTube video explains it better than I would. I guess the formal name for this is "heat crossover". The riser is actually on the air intake. The video is about a Chevy engine, but it is the same concept. When I replaced my intake manifold the gasket set came with the block offs.

 

Thanks! That clears that up.