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Boost Reference Fuel Pressure System

Fueling - Boost Reference Fuel Pressure System
Fueling - Boost Reference Fuel Pressure System
Fueling - Boost Reference Fuel Pressure System

The ZZPerformance Boost Reference Fuel Pressure System (BRFPS) easily installs into your Cobalt or Redline allowing fuel pressure adjustment above the PCMs range of adjustment.  We prefer the "manifold regulated pressure" way of installing it, this lowers fuel pressure at idle to cure large injector idle issues and raises fuel pressure under boost to help fuel high HP applications. Required for LSJ's running over 17psi of boost or LE5's over 12psi.

Manifold regulated fuel pressure:
For this installation method, the factory in canister regulator is bypassed. This requires dropping the tank and bypassing the factory 60psi regulator. When the canister is removed, open the canister and clip off zip ties holding the clips on the regulator. Now open the regulator to expose ball and spring tab, next remove ball and spring tab, then clip fuel diverter back on and re-install canister.
This will have two different ways to get a boost/vacuum signal to the rear mounted ZZP regulator.  You can either use the factory EVAP line for a boost/vac line, or it can come with a reel of flexible steel tubing that you can run from the engine, all the way to the back where the regulator is located.
When everything is installed set your fuel pressure to ~42psi at idle under full vacuum, and rise 1:1 under boost. This requires PCM reprogramming.

Full return system:
This installation option is the same as above, but includes an adapter piece up front to change your system to a full return style fuel system using the EVAP line for fuel return. There are no benefits performance wise to doing this, but some customers have requested it, so we are offering it as an option.

So how and why does this kit work? What is it actually doing?

The PCM doesn't compensate for boost over 17.5psi (12psi on LE5), so the car begins to go lean after that because the PCM file does not see more boost above the 17.5psi. This is unless you raise fuel pressure the same amount as boost, which is exactly what our BRFPS does. You can try and tune around the 17.5+psi but it's guess work and a very poor solution.

Fueling - Boost Reference Fuel Pressure System
Fueling - Boost Reference Fuel Pressure System
Fueling - Boost Reference Fuel Pressure System
Customer Reviews
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Dyllan J.
United States United States

Great Product, Easy Install

Awesome quality. Add to evap kit made it super easy to install, makes sure my LSJ-T has plenty of fuel to get the job done. Love being able to use the factory PCM on this platform with the creative solutions offered to us. 10/10 recommend.

Elijah G.
Canada Canada

Worked like a charm

Super easy to install on the car. Tuning was a bit tricky to get dialled in but once everything is in line it was great to see consistent fueling

Joshua V.

So worth the pain it was to research and create a whole new fuel system. Worth every penny...

This may be a lengthy review... Mainly, it was very confusing how to set up and install the regulator. The model I used had the 3/16th fuel line. The regulator is a very nice piece and even has a port to install a pressure gauge. The photos just don't show it on the back side. The instruction were lack luster to say the least and the instructions from Fuelab were set up for a V8. Most of the info online left me searching for more answers. I did contact ZZP customer support for further instructions and help. They did provided me with a few more bits of literature to read and chew on. Ultimately, I ended up having to run down to my local old dude hotrod shop here in St. Louis to get some old gear head knowledge. Ended up running the set up as follows.... This is just a brief and very cut down version of what I did. First I cut and removed all of the steel fuel sender lines running along side the bottom of the car and removed the stock fuel rail and all its parts. Switched to a different fuel filter at the back of the tank that had 2 - 3/8ths push on fuel connectors, 1 for the stock return evap line and 1 for running my new line feed line. I then used adapters from 3/8ths fuel line to a -6AN hose connector and than ran a -6AN braided stainless steel line to the front of the Cobalt's engine bay as my new fuel sending line. Then connected the new feed line to an OBX R fuel rail using a -6AN adapter to a NPT fittings. Fuel rail is now fed... well after heavy modification to the OBX R fuel rail. It won't fit with out some machining work. Now moving the fuel out of the other side of the fuel rail I ran another stainless steel line to the input of the fuel regulator (middle port using the photo above). Next I used my adapters to run yet another stainless steel line from the return port of the regulator to the back of the car ( bottom port). The I drilled a hole in the gas tank and mounted a -6AN bulkhead fitting connecting the return line to the gas tank and kept all emission systems in tack. Next was supplying the Boost Reference regulator with some boost. Here's where it got tricky since I was also running a new mechanical boost gauge. I took the boost line coming out of the intake manifold located just below the fuel rail and ran that to my vacuum block manifold. That way I can run multiple boost/vacuum lines. So, basically just took the intake boost hose and put in a tee fitting and connected the system. I know this could of been way more detailed or posted a tutorial online. But, I enjoyed the problem solving of making this work and hopefully this is a descent outline for how you should plan way way way a head before under taking a complete fuel system reconfiguration job. All in all I couldn't be happier with the regulator and was a nice piece to my fuel system build up.