Any obvious or not so obvious issues with relocating the fuel pressure regulator to the gas tank and running 1 supply line up? At EFI fuel pressure I'm not too concerned about the gas turning into vapor in the lines like the old carb days.
I know GM did it with the later LS1's, so why not TPI/TBI?
For the record, this engine bay is going to be very clean. Hard to service but clean and empty .

 

I thought the LS1 cars used voltage regulation like the newer mustangs did ?

There is a sensor on the fuel rail which tells the ecm to modulate higher or lower voltage (on the mustang setups).

I guess what your trying to do, might work with like a TPI style regulator where you have an IN and an OUT. Or if you can work out some type of mini fuel rail in the rear for in and out purposes.

Personally, I think your creating busy work. But thats just me.
I can't say I havn't been guilty of wasting hundreds of hours on crazy ideas too.

-- Joe

 

You can just run a fuel pressure regulator by your tank. That will work fine. I am prittly sure ls1 regulators are built into the fuel filter. Well on corvettes thats how it is.

 

woops didnt read your post good enough. I dont know why they didnt do that in the first place. Maybe they were concerned about fuel pressure variations.

 

The reason they didn't do this is because on TPI and most port injection the regulator is manifold pressure referenced. This is to say that the computer didn't do any compensating for the fuel flow rate when the injectors saw vacuum vs seeing atmosphere pressure. The newer LS1's use the MAP sensor which is very fast reacting and calculate the injectors flow rate based on the manifold pressure! Basically compensating for the change in manifold pressure through code.
The only concern I would have with relocating the fuel pressure regulator for my TBI is air. Although I doubt it would be problem it could if the car sat long enough and air krept past the injectors. Even then, because most of the line is below the tank it's not like it would take long before fuel displaced the air.
TBI pressure regulators aren't manifold pressure referenced since the injectors themselves do not see manifold pressure .
Yes this is more work for me but almost not if you think about it. I'm replacing my fuel rails and running an external regulator so why not just run 1 line? It's not like I sit here and play with the fuel pressure, I set it and forget it.