Conversion to EFI : Fuel system

[Kurek, Larry]

Just to follow up on this...

The new LS1 F/Y-bodies have a similiar setup to the Fords, etc with the one
line only and reguilator in the tank. I have heard as well that this was
done for reasons as Ward mentions below...

FYI...

Larry


> You guys do know there are a lot of cars out there that do 
> not have fuel
> return lines, Chrysler, and Ford for example use pressure 
> regulators that
> are in the tank.
> 
> You may be overlooking the fact that the fuel in the tank will reach
> something near underhood temperatures aft a relatively short 
> time. Probably
> about 150 Deg F. Common. (but wrong) thinking is that cold 
> fuel will be
> coming from the tank, Maybe in the Arctic. Obviously if you 
> circulate a lot
> of fuel through a hot environment the heat will transfer.
> 
> New car makers have a major probable with Carbon Can systems 
> loading with
> hot vapor from the tank. The ECM/PCM will enable can purge 
> when it thinks it
> can get away with a period of rich fuel, If you look at the 
> Short term fuel
> correction value you can see the engine going very rich until 
> the purge is
> done or disabled. using a late Camaro as an example the 
> pressure in the fuel
> tank will get high enough to blow the fuel cap out of your hand when
> removing the fuel tank cap !
> 
> So anything you can do to reduce fuel heating will make the 
> emission problem
> more manageable,