I have a boosted 03' Accord V6 and am running RC550cc injectors. The way the stock fuel system is setup is a problem. The fuel first goes to the rear bank and fuel rail. then off of that its fed to the front bank and fuel rail. This system is non-return. The problem I'm having is the rear bank which gets the fuel first is starving the front bank. So would a FP regulator correct the problem or do I need to make a fuel return for the system to operate properly? If I read my 02 sensor which is placed after the turbo where both banks A/F ratio has combined my 02 reads good. But after checking the spark plugs and seeing how rich the rear bank is compared to the front bank I know there is a problem with the fuel delivery.
Thanks for any help in advance.

 

I don't know how practical, but my first thought is this...

Coming from the fuel supply, branch the fuel line so it feeds both rails in parallel. Since it's non-return, you don't have to rejoin to an FPR, right? I don't know the plumbing details since I don't have a V-6.

 

I'll try to get a diagram drawn up on paint to better explain how its setup. I still think that the pressure may not be sufficent to feed the injectors that are last on the fuel rail. How can I increase my fuel pressure so that I can be sure all injectors are recieving the right amount of fuel. Thanks

 

If you have a high enough flow rate to produce a pressure difference from one end of the rail to the other, then increasing the fuel pressure isn't going to fix it. Everything will be higher, & you'll still have the difference from one side to the other.

I don't really know how they regulate pressure in a non-return system, but when you talk about using an FPR, you have to remember that a conventional FPR operates on the return. Can't work on a non-return system, so be aware of what you're getting.

 

Thanks for the heads up. Would increasing the injector pulse on the farthest injectors make a difference?

 

Probably, but that sounds to me like a goofy way to fix the problem.

OTOH, the correct way seems to be redesigning the fuel rails - $$$$

Before you take my word for it, I hope someone posts who really knows how the non-return system is controlled.

 

AFAIK, on non-return systems, the regulator is in the gas tank, leaving the whole front side of the fuel system as a "dead-head". I would say converting it to return line, splitting off the feed to both rails, and then rejoining into a good regulator should solve the problem.

 

What about using fuel rails from a returning system? They should be sized for large flow THRU the rail, not just the flow that's used by the injectors. You can still branch to both rails, instead of going thru one then to the other.

Pressure drop depends on flow, not on pressure. So the rails for a return system should handle a bunch more flow vs. the rails from a non-return system.

 

Your correct on my setup. The fpr is in tank.

First thanks to both of you for giving me some help, for a while there I didn't think I was gonna get this figured out.

I got an estimate from a shop to do a fuel conversion on my car from non-return to return system with all parts included and it was between 900-1000 bucks is that about right? I think this will be the best method to ensure both banks are getting proper fuel. Thanks again guys

 

That doesn't sound too bad. 2x fuel rails, probably $250-$300, $140 for an aeromotive reg, another $100 for a walbro, plus a return line, and misc lines for the rails. Throw in labor, and that sounds about right.

 

I'm not sure the fuel rails are included. I think that is just to make a return line from existing fuel rails w/new pump and fpr.