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Project LS350Z Part 4 - The 800+HP E85 Fuel System

With a goal of near 700rwhp on E85, we needed a stout fuel system

Mark Gearhart
Aug 15, 2017

A car's fuel system is the lifeblood of your combustion cycle. If a pump maxes out and is unable to deliver the fuel the injectors need, a lean situation can lead to detonation. The stock, single fuel pump simply doesn't create the amount of volume we need for our ECS/Paxton supercharged, LS3-powered 350Z. We turned to Russell, Fuel Injector Clinic, and CJ Motorsports to build a stout but reliable fuel system for our Z33.

Several companies offer single pump upgrades that work with the Z33's stock fuel pump module but none of these single, in-tank pumps can supply the volume we need. Our fuel demand at wide open throttle necessitates a minimum pump flow rate of 520 liters per hour. Even twin 255-lph pumps aren't going to be enough.

A look at the parts:

  • CJ Motorsports 255/450 twin-pump module
  • Edelbrock PN 1729 1:1 rise rate fuel regulator
  • Russell PN 64900 10-micron billet -8AN fuel filter
  • Russell ProClassic II -6AN and -8AN hose
  • Russell Full Flow hose ends, coupler, and adaptor fittings
  • Innovate Motorsports ECB-1 with flex fuel sensor
  • Fuel Injector Clinic IS303-1000H 1000cc injectors

The CJ Motorsports twin pump module is the heart of the system. Ours contains the 255/450 pump combination that will support around 850 rear-wheel horsepower on E85. The 255 pump will operate as the primary under normal operation and then the 450 will switch on via a Hobbs switch at 2 psi of boost. This method keeps the fuel cycling to a minimum and ensures optimal pump life.

Project LS350Z Part 4 jeff jordan Photo 2/11   |   Helping us mate the 350Z to the Howell EFI factory-style LS3 wiring harness is Jeff Jordan of Jordan Innovations. Since our system uses two pumps, Jordan needed to wire relays for both.

The pump module retains the use of the factory fuel level sending unit and has three ports on the top hat - two feeds and a return. The return dumps back next to the fuel pump's pickup and also retains the use of the factory jet siphon system. We enlisted the help of Jeff Jordan of Jordan Innovations to help wire our car, including the twin-pump system.

Project LS350Z Part 4 CJ motorsports fuel pump module Photo 3/11   |   The CJ Motorsports fuel pump module has two outlets for each pump and a single return.

Russell ProClassic II -6AN hose and fittings leave the hat and enter a Y-block under the car. Two -6AN lines merge to a -8AN male that is then connected via a female-to-female Russell coupler fitting. On the other side of the coupler is a Russell inline 10-micron fuel filter. Russell's low-profile, 12-inch billet filter housing is double o-ringed and contains an E85 compliant paper filter, which can support up to 1,800 horsepower worth of fuel flow.

The -8AN Full Flow straight fitting with ProClassic II line end the feed line feed at the back of FAST's billet fuel rails on the passenger side. These straight through rails feed a set of Fuel Injector Clinic 1000cc injectors.

Project LS350Z Part 4 flex fuel sensor Photo 4/11   |   The flex fuel sensor from our Innovate Motorsports ECB-1 gauge will send its data back to the factory PCM as well as the gauge. Russell 3/8th AN line adaptors provide a leak free connection to our -6AN return line.

"Typically there are two ways to increase the flow of an injector," explains Fuel Injector Clinic's Tim Jilg. "You can either increase the travel of the valve or you can change the opening the fuel can flow through. Both have to be handled very carefully with lots of post-modification testing.

When opening the fuel flow orifice, there are some reliable modifications that can be done when you have the equipment to test both the effect of your modifications as well as providing the new computer data to make the injector work correctly after the modification. So we advise any potential customer to ask about the method of modification and certainly demand full data of the modification when choosing this route."

Project LS350Z Part 4 AN line assembly Photo 5/11   |   A set of soft jaws for the vice, adjustable AN wrench and cutters are all you need to assemble AN lines. The ProClassic II nylon construction is super easy to cut.

The backside of the driver's side fuel rail begins the return back to the tank. Before doing so it enters an Edelbrock 1:1 ratio EFI fuel regulator. The silver and black finish of the regulator matches our Russell fittings and is made from air craft grade aluminum. A fluorosilicone diaphragm provides extended life and high temperature protection. Adjustable from 35-90 psi, the Edelbrock 1729 is also compatible with gasoline or ethanol.

Project LS350Z Part 4 CJ motorsports fuel pump hat Photo 6/11   |   The CJ Motorsports hat mounts in place with new hardware. The hard lines will need to be removed to make room for the AN lines. It's tight in there but the lines can be installed without dropping the fuel tank.

Before returning to the tank the fuel line passes through an Innovate Motorsports flex fuel sensor. Late model Chevy PCMs can be wired for a flex fuel reference signal to enable the flex fuel tables. Additionally, the flex fuel sensor feeds an ECB-1 gauge. This nifty 4-in-1 gauge reports the ethanol content percentage, temperature of the fuel, boost pressure, and air/fuel ratio. We will cover the installation of this gauge in a later segment.


LS350Z Part 1
LS350Z Part 2
LS350Z Part 3

Project LS350Z Part 4 russell fuel filter Photo 7/11   |   Both -6AN feed lines merge to a Y-block, then into into the Russell -10 micron 12-inch fuel filter. The filter has -8AN inlet and outlets. Pump socks serve as the pre-filters in the tank
Project LS350Z Part 4 fuel rail Photo 8/11   |   A 45 degree Russell hose end feeds the passenger rear portion of the fuel rail. A crossover on the front makes its way past the driver's side injectors and out the back of the fuel rail. One last stop at the regulator before heading to the fuel tank. Our FAST LSXR intake manifold has a vacuum reference on the back of the manifold.
Project LS350Z Part 4 fuel injector clinic fuel injectors Photo 9/11   |   Fuel Injector Clinic's fuel injectors come in a nice hard case that's packed with foam.
Project LS350Z Part 4 fuel injector clinic data matching Photo 10/11   |   Data Match Technology is Fuel Injector Clinic's propriety injector matching process, which matches our injectors by both their slope flow rate as well as their individual offset values. This level of matching has a large effect on idle quality and only gets more impactful on idle quality as injector size increases. In addition, Fuel Injector Clinic also provides plug and play OEM ECU data for many factory ECUs, including: Ford, Chevy, Dodge, Subaru, Mitsubishi, and more.
Project LS350Z Part 4 fuel injector clinic fuel injector Photo 11/11   |   There are several factors that contribute to good idle quality, especially in larger injectors. Fuel Injector Clinic's Data Match Technology is at the heart of our process, precisely matching their injectors by both their individual slope flow values as well as their individual offset values. "We have also begun a new, even more advanced matching process which also matches our larger injectors in their short pulse area of operation," explains Jilg. "Because larger injectors can be asked to operate at very short pulse widths (at or below 1 millisecond) they may dip into a non-linear range of operation, which even advanced matching methods have not been able to compensate for-until now."


Innovate Motorsports
Irvine, CA
Fuel Injector Clinic
Hobe Sound, FL 12938
Russell Performance Plumbing
Torrance, CA
Jordan Innovations
Irwindale, CA 91706
Torrance, CA 90503
By Mark Gearhart
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