Aeromotive Part Number: 66182
Legacy VaporWorx Part Number: PWALLY-DUALXFM

Compatibility: For use with any OEM fuel system control module (Ford, GM, etc.) when using OEM fuel modules with either an OEM Fuel System Control Module (FSCM) or aftermarket ECM pulse driver. This kit will also work with the OEM Gen2 Cadillac CTS-V2 fuel module when using aftermarket high-flow pumps like the AEM or DW300 pumps.

The Ally DualX kit will perform the following basic functions:

• Whenever the primary pump is running, the Ally DualX controller will also be running. Typically used with OEM fuel pump modules. It is important to have the second fuel pump module be running all the time or else it may run dry under some conditions.
• Whenever the ECM is providing either a positive or negative pulse, the Ally DualX controller will also be running the primary fuel pump(s). Typically used with aftermarket ECM's + naked pumps in a mechanically pressure regulated fuel system.

For clarity, there are many names for the modern OEM fuel pump driver/fuel computer. Fuel System Control Module, Fuel Pump Pressure Module, Fuel Pump Driver Module, etc. These OEM drivers all basically do the same thing; they communicate with the ECM to drive the fuel pumps at the speed needed to provide the requested fuel pressure. These are exact systems that use a fuel pressure sensor as feedback. Nearly every aftermarket ECM does not have this capability. Instead, they may have an option to output a signal to a pump driver. These are not exact systems and require an external fuel pressure regulator. We'll get to that in just a moment, but please keep reading since many of the features carry over with the returnless systems.

The newest series OEM engines and engine control systems have some of the best fuel control technology available today. But, like all gearheads, we usually want more, right?

Unfortunately, the OEM FSCM's leave much to be desired when more fuel is needed. They do not have sufficient electronics power capacity and insufficient wiring terminal size to supply power for more than one fuel pump. To keep the FSCM working it needs some help.

This kit allows the OEM FSCM to control the primary pump while the VaporWorx Ally DualX controller "Piggybacks" and takes care of the second. The Ally Ally DualX takes its operating commands from the FSCM pulsed wire to tell it how to operate. No user programming, system changes, or adjustments are needed.

When used this way there is sufficient power for all fuel pump modules while maintaining full FSCM CAN feedback and diagnostics. All pumps will effectively be under the control of the FSCM. This arrangement typically eliminates MIL codes caused by too much power being required by the FSCM. This is a popular way to use high-output pumps (Deatchwerks and AEM) in Cadillac CTS-V2 fuel modules to eliminate the troublesome MIL codes. Use the FSCM to drive one pump, and the VaporWorx Ally controller to drive the second pump.

With just a single 20ga wire to attach to the FSCM fuel pump pulsed wire to the fuel pump, it’s just battery power in, and fuel module power out. No on/off switch, etc. It just follows the FSCM once it turns on and controls the secondary module. The Ally controller can use either a pulsed positive (nearly all OEM applications) or a pulsed pull-to-ground signal for operation

It is strongly suggested to NOT use an inline filter with with OEM fuel modules except Gen3 Coyote GT500. Final filtering is built in. Some aftermarket fuel filters have a built-in check valve which will cause a heat-soak related overpressure condition that will lock up port type fuel injectors.

For those that have an aftermarket ECM like the Holley Terminator, Dominator, etc. that have the option to output a pulsed signal, it can be routed to the Ally DualX controller to provide a high-power fuel pump driver module. Create a table using the ECM software to slow down the pump(s) during idle/cruise (roughly 50% duty cycle) but have them at full speed (100% duty cycle) before the engine reaches full power. The Ally DualX controller can use either a positive or pull-to-ground signal. Nearly all solid state relays are not up to the task of properly driving inductive loads (pumps, fans, etc.) at the high frequencies needed to provide proper pressure control. The Ally DualX has this covered and much more.

Features of the kit include:

• Everything needed electrically to drive the fuel pump module. No relays, Hobb's switches, etc. are needed.
• Unmatched low fuel level capability when using an OEM fuel module as the second pump.
• A ½ - 2/3 reduction in power to the fuel pump during idle/cruise vs traditional systems.
• 40A minimum continuous power rating in a compact controller package. Total size 4" L x 2.1" W x 1-5/8" H.
• Over-temperature shutdown with automatic reset that will operate indefinitely without damage.
• Short circuit protection with automatic reset that will operate indefinitely without damage.
• OEM Delphi/Aptiv connections for terminals, seals, and connector bodies where appropriate.
• All cross-linked polyethylene wiring.
• UL94 rated components used throughout.
• 10-22v operating capacity. Can be used with voltage boosters. 

Below is a basic layout diagram using Gen5 Camaro ZL1 fuel modules. Other fuel module layouts will be similar. Please specify which fuel modules are being used. For CTS-V2 chassis, there will not be two fuel modules, just one. The intent is the same where one pump is driven by the FSCM, the second by the Ally controller.

NOTE: Do not combine the pump grounds/low reference wiring. The FSCM ground wiring MUST remain separate and not be connected to anything else. The FSCM monitors the ground side, and if connected to ground will detect a short-to-ground fault.