I recently researched EFI regulation a bit and found something interesting. Many modern (post-1995) vehicles have "returnless" EDI systems where the regulator is in or near the tank, not the engine compartment.

It turns out this isn't for complexity reasons, though it does save a bit. It's for emissions. The heating of the fuel in the engine compartment transfers heat back to the tank. The tank's emissions do count even though they're not huge. It's also one less part, hose, and set of fittings to fail-  and get warranty calls on.

To deal with vapor lock they just crank up the pressure to 65 or more psi. Very effective.

Not at all saying we should do the same, but the purpose is interesting, no? As well as the vapor lock" solution"...

Regards,
Chad