Confusion about Fuel Pressure regulator..

[Shahzad]

Hi all... http://fsae.com/groupee_common/emoticons/icon_smile.gif i am an engine team member working for a team from Pakistan. we actually are the first team from our country so things get a lot difficult for us.

I am actually confused about the Fuel pressure regulator. The engine we have opted to use is CBR 600 RR, it has 8 injectors in total. We have planned to remove the airbox & injectors that come with the airbox so in total we will be working with the main 4 injectors. I have observed that the main injectors do not have a return line, the injectors mounted on the airbox have return line attached with them. So my question is that whether i would need a fuel pressure regulator? as i have planned to use an external, return type walbro fuel pump.... what would be the whole scenario ?...

Awaiting & anticipating your response http://fsae.com/groupee_common/emoticons/icon_smile.gif Thanks for your help in Advance..http://fsae.com/groupee_common/emoticons/icon_smile.gif

[Shahzad]

Hi all... http://fsae.com/groupee_common/emoticons/icon_smile.gif i am an engine team member working for a team from Pakistan. we actually are the first team from our country so things get a lot difficult for us.

I am actually confused about the Fuel pressure regulator. The engine we have opted to use is CBR 600 RR, it has 8 injectors in total. We have planned to remove the airbox & injectors that come with the airbox so in total we will be working with the main 4 injectors. I have observed that the main injectors do not have a return line, the injectors mounted on the airbox have return line attached with them. So my question is that whether i would need a fuel pressure regulator? as i have planned to use an external, return type walbro fuel pump.... what would be the whole scenario ?...

Awaiting & anticipating your response http://fsae.com/groupee_common/emoticons/icon_smile.gif Thanks for your help in Advance..http://fsae.com/groupee_common/emoticons/icon_smile.gif

[Demon Of Speed]

The fuel injector need a constant pressure to be able to deliver a constant amount of fuel as the same pulse width. You will need to find a way to maintain this pressure to the injectors, whether it is using a regulator of some kind, or turning the pump on and off a lot. experiment and see what works best for you.

[B Lewis @ PE Engine Management]

The RR has an internal pressure regulator in the pump assembly located in the tank on the stock bike. It keeps the fuel pressure at a constant absolute pressure of 50 psi. The "return" line that you found in the airbox is not a return line at all, it is a supply line for the primary injectors. There is no return line to the tank since the pump is internally regulated.

You will definately need a pressure regulator for your setup. If you use an external pump I would recommend using an external regulator that is MAP pressure referenced.

Good luck.