Nevada - external fuel pump and regulator

[Martin boichat]

Hi all.
We have looked through many Posts here and can’t quite get a definitive answer.
I am looking to replace my Nevada fuel tank and need to have an external fuel pump.
From what I can see the engine runs at 3 bar, fuel pump 3 bar or similar but the pressure To the injectors is regulated by the regulator. I have three options for setting this up.
1) all items in line with the pressure regulator return at 5 bar to the tank. (Regulator needs and in,out and return)
2) no return to the tank - could this blow the engine?
3) Regulator in return line. Would this regulate the pressure to the injectors ok? (Regulator only needs an in and out)
I have attached a drawing of these three configs (hopefully)



If anyone Has any help on the configurations or parts I would be extremely grateful. This is my first guzzi and the first efi I have worked on.

 

[V700Steve]

Bosch #0580464048 is the pump for external use on a bigblock. There is a FI manual Guzzi put out, very usefull. Todd here has it in resources.
I would do a return to tank. I have seen a replacement pressure reg on an EV, so , they are out there.

 

[Martin boichat]

Thanks Steve.
I think that pump may be a bit high flow at 3 bar for my small block. I have seen the Bosch 0580464070 which does 135lh at 3 bar. Stock I think is 95lh at 3 bar.

My main issue now is finding a 3 bar regulator with return at 5 bar. Just can seem to find the part.