The FMU mounted on the inner fender near the horns on the driver side of the car. Our model was an 8 to 1 unit (there are others available), meaning for every 1 pound of boost, the FMU adds 8 pounds of fuel pressure. Do the math: At 10 pounds of boost, that’s 80 psi of fuel pressure! Zoinks! Not believing this could be possible, we ran the Camaro down the nearby international raceway boulevard, watched the big Auto Meter fuel gauge (in a glorious hood-mounted locale), and geeked when the needle passed 100 psi. According to Vortech Engineer Mike Regan, the huge number is produced when the FMU pressure is added to about 50 percent of the static pressure (20 psi). This essentially shut the injectors off after they maxed out at 90 psi and caused problems. We’ll fix this later.