This page provides Brucato ACU fuel curve files for reflashing your own Brucato ACU on Mercury/Mariner EFI and Hi Performance 2.5 outboards from 1988 to 2001.
 
All files are compatible with both grey cast housing and black billet housing Brucato ACU and PCU units.
 
To use these fuel curves, you must have:
A properly installed Brucato ACU or PCU unit
The plug-and-play USB tool (includes software and interface cable)
A Windows laptop with Microsoft Excel (macros enabled)
 
Download the file you need, then transmit it to your ACU using the Brucato management software. Full step-by-step reflashing instructions are available in the Brucato ACU Self-Help Center on this website under the Tech Hub.
 
How to Load a Brucato ACU Fuel Curve
 
Download the desired fuel curve file to your Windows laptop.
Connect the plug-and-play USB tool (interface cable) between your computer and the Brucato ACU.
Power the ACU using the 12-volt adapter or the boat’s wiring harness.
Open the management software in Microsoft Excel, enable macros, and use the Calibration tab to transmit the new fuel curve.
 
Detailed cable connection, COM port setup, and software instructions are in these free PDFs from the Self-Help Center:
brucato-acu-software-management-instructions.pdf
brucato-acu-installation-instructions.pdf
 
Available Brucato ACU Fuel Curve Files
 
Mercury 150 / 150 Pro Max (2.5L)
Mercury 200 / 200 Pro Max (2.5L)
Mercury 225 Pro Max (2.5L)
Mercury 220 Laser (2.4L)
Mercury 245 Bridgeport (2.4L)
260 EFI (2.5L)
280 EFI (2.5L)
300 Drag (2.5L)
300 SVS Drag (2.5L)
 
Make Your Own Brucato ACU Fuel Curve File(s)
 
Fuel Curve Generator
 
How to Use the Brucato Fuel Curve Generator
 
The Fuel Curve Generator for FCR-4  file lets you create or modify fuel maps.
 
Open the spreadsheet in Excel.
 
Adjust values in the 24 RPM columns and 16 load rows (add or subtract 1 for ~1% fuel change).
 
Save your changes, then load the updated map into your ACU using the steps above.
 
Technical Notes
 
All files are provided in .xlsx format.
After loading a fuel curve, always verify TPS adjustment and monitor spark plug color.
Use resistor spark plugs only.
 
Before and after loading any fuel curve, use these free guides from the Brucato ACU Self-Help Center:
 
brucato-acu-common-troubleshooting.pdf
brucato-acu-tps-adjustment.pdf
brucato-acu-cold-start-enrichment.pdf
brucato-acu-safety-and-best-practices.pdf
ngk-spark-plugs-mercury-v6-brucato-acu.pdf
 
This page is for self-service Brucato ACU fuel curve downloads and reflashing on Mercury ProMax and EFI outboards. Always follow the instructions carefully and verify basic motor operation after any changes.
 
Note: Files will be emailed to your email address on record.
 
Last updated: April 2026