FASS Regulator Upgrade Kit - Driven Diesel - 75PSI Spring - 6.0L / 7.3L - Ford

WARNING: The 75psi spring and Red Fitting in this kit are made and approved by FASS for use in all FASS Titanium and Signature Series 125G & 140G pumps for the 7.3L or 6.0L PowerStroke.
Use of the upgrade spring in higher volume pumps (Over 140gph) is NOT approved by FASS.
           The Silver Fitting in this kit is a Driven Diesel product and NOT approved by FASS. It's included for performance minded customers seeking maximum performance from the FASS pump without concern for the FASS warranty. Use the Silver Fitting at your own risk!  Read below for details regarding why Driven includes the silver fitting and what benefits it offers.

This kit includes EVERYTHING you will need to upgrade ANY FASS Titanium or Signature Series High Pressure (55-65psi range) pump to operate at 75psi. It is offered here for use with 7.3L and 6.0L Ford Powerstroke pumps (TF14125G & TSF14140G). The included instructions detail which pieces you need to use for different pump models and situations, you may not need every piece in your installation. If you are running a modified fuel system with a bypass fuel pressure regulator on the engine, this is the kit you need to have constant and stable 65psi fuel pressure in the fuel rails.

This kit will fit higher volume versions of these pumps, but we have not flowed those combinations. Some experimentation may be necessary to ensure that you are not running the pressure too high. In any case, using this kit in a pump that is larger than 140G WILL void you warranty with FASS!

FLOW RESULTS WITH SILVER FITTING:
• MASSIVE 45% Increase in Flow at 65psi!
• ONLY 1.5% Increase in Amp Draw at 65psi!
• NO Measurable Difference in Pump Motor Temperature
• NO Audible Difference in Pump Motor Sound
• Still Maintains Significant Return Flow for Air Removal

See Chart Below:
              The ORANGE line in the Flow Comparison Graph represents a FASS TSF14140G pump with the RED FITTING and the SPRING from this kit installed. This was running on our flow bench with a Fuelab Bypass Fuel Pressure Regulator, simulating a common Regulated Return system. Typical of any fuel pump, as you increase the fuel pressure, the flow rate drops some. As you can see, once we reached the point where the regulator in the FASS was cracking, the pressure started dropping at a quicker rate.

              The GREY line in the Flow Comparison Graph represents the resulting flow increase from using the SILVER additional fitting we include in this kit. The PINK shaded area represents the improvement in the 60-70psi range. In a nutshell, if you are running an APPROPRIATELY SIZED* and PROPERLY INSTALLED FASS Titanium or Signature Series pump with the FASS 75psi SPRING (and RED FITTING if appropriate for your pump) from this kit, and you are still seeing pressure drop under throttle, adding the Silver Fitting will take care of your issue.