Before you begin replacing stuff, you could first verify it actually is vapor lock. First, just make sure you use an ethanol free fuel blend or better, no ethanol blend. The ethanol blend gasoline can boil as low as 100°.
If you still have the problem, you can verify by replacing the pump to
carb line with a clear tubing and watch if you see bubbles in it.
If that is what is happening, then try to install a heat shield, one of the easiest solutions to preventing vapor lock is to use a thermal-barrier sleeve on the lines such as a Thermaflect Sleeve from Heatshield Products. If that doesn’t work, or you’ve determined it is not vapor lock, check fuel pump flow rate. Check your owners
shop manual, flow rate should be around 30 gph, and pressure greater than 4psi. If your fuel pump is light, and filter is not clogged, then replace with Carter M73063.
If not Vapor lock or fuel system, then look at coolant system.
Is water pump working?
Does system need to be cleaned and flushed?
Are
radiator openings open so air can flow through.
Casco and prestige sells a veined pump and spacer replacement that fit
Also check your thermostat. If it doesn’t work, think about replacing with a thermostat such as the Gates 33038.
These are high quality
parts and you should not need to modify original engineering on car.
Once you start replacing original engineering, you open up new cans of worms.
As a last resort if you feel the need to make non stock modifications, Prestige thunderbird sells an electric pump with a return line to the tank to cool the fuel by recirculating it.
That’ss lot of stuff out there.
You can check this link:
https://www.fordthunderbirdforum.net/******/viewtopic.php?t=13544
