Ryneman

I have stock injectors, stock fuel pump, professional products fuel rail complete setup (p/n: PPC-10612)

link: http://www.rpmoutlet.com/gtorail.htm

So can I just install the fuels rails and be done with it or do I need to also install an aftermarket fuel pressure regulator?

I thought that the stock fuel pressure regulator was in the pump assembly in the tank?

Thank you in advance.

Old Geezer

iTrader: (3)

Stock system/aftrmkt rails= no add-on regulator.

Ryneman

Thank you,

I didn't think so, I will just install the fuel rails and be done with it.

Thank you again

MIGHTYMOUSE

iTrader: (59)

i have to ask.. why bother with the rails at all?

Lonnies Performance

iTrader: (16)

Yes, without switching to an aftermarket regulator/return system, the rails are nothing but a decorative add on.

jkkaz

True, but does that stock damper built into the rail do anything? Would you get fluctuations in fuel pressure using after market fuel rails with no damper?

Lonnies Performance

iTrader: (16)

There are thousands of vehicles in use without the damper.
It will be fine without it.

Ryneman

LOL. I know that they will be only decoration without injectors. I do plan on getting 30+ injectors that will work well with the stock fuel pressure. Still looking for a good injector that I can have for awhile.

So I do not need the damper.

Thank you all.

custm2500

iTrader: (11)

Why would the regulator and return have anything to do with the performance of the rails? I could see the supply side but the return!? Not trying to be a dick or anything I am trying to understand how or why. Thanks

Lonnies Performance

iTrader: (16)

Adding aftermarket fuel rails to a stock fuel system will offer no performance advantage only cosmetic benefits.
The rails already outperform the rest of the fuel system. They are probably the last item that needs replaced.

The factory pump or any replacement 255lph pump will be the limiting factor to flow before the rails are a problem.

The limits of the stock fuel system is the lack of a return line & front mount regulator. The need for these items will also be recognized before the factory rails become a hindrance to flow. Once you augment the fuel system with a corresponding front mount regulator & return line, & enough fuel pump capacity, then the system is capable of supporting more flow than the factory rail setup is capable of.

custm2500

iTrader: (11)

So it is a matter of the position, and flow abilities of the stock regulator why they need replaced before the stock rails.

Ryneman

So I also need front mount regulator, return line & a new pump to accomplish my needed fuel pressure and flow for 30 + injectors?

Lonnies Performance

iTrader: (16)

Ryneman, A good suggestion when asking these questions is to explain your list modifications, power level, & intended results so it is possible to understand exactly what you are trying to do. It sounds like you are upgrading rails because you are adding larger injectors. Until I know your power level, I cannot determine if either is necessary.

The only determining factor is how much power you are making.

Up to around 400rwhp, stock everything is fine.
Above this you may want to upgrade to larger injectors & 255lph pump.

Above 550rwhp, you should may need more than a single 255lph pump can provide.... like the twin intank setup that I make.

Above 650 rwhp, a return system & regulator is recommended.
This is also a good time to add rails etc. as it makes the return line easier to hook up.

Custm2500, The regulator needs upgrading in high HP applications mainly because of its location on an F-body. Since it is in the tank, it cannot accurately contol the pressure at the engine... the only place pressure really matters. People that have over 600rwhp, have increased the demand on the fuel system significantly. At this point the supply line becomes a significant restriction & will cause a pressure drop at the engine. The intank regulator cannot compensate for this, as it is happliy maintaining 58psi in the rear with no ability to know what is going on in the front of the car.

The goal is steady repeatable fuel pressure at the engine so tuning is correct. Also forced induction applications will benefit from boost referenced fuel pressure to help offset the manifold pressure & support more HP on a given injector size.

Pwebbz28

iTrader: (31)

Very informative Lonnie! Thank you.