Review on Holley HOL 12-804 12-804 Fuel Pressure Regulator: Optimal Performance and Fuel Efficiency by Leo Govindan

regulators purchased from Baxter, unit arrived in 4 days. However, the part number on the box was 12-804, which should be a 1-4 psi regulator. BUT the part number engraved on the unit was 12-804 4.5-9 psi which does not exist. Part number 4.5-9 should read 12-803. I contacted the supplier and he offered to fix the problem. However, I also contacted Holley's support number and was informed that some regulators were mislabeled. Problem with lettering and internal spring. The 12-804 1-4 psi block should have a red spring. Spring 12-803 4.5-9psi Smooth, (Gold Plated Only) Spring is available and can be replaced by removing the 4 screws that hold the unit together. Holly offered to send me a repair kit with both springs for free. If you buy one of these, it's probably a good idea to open up the device and see if the nib is for you. If your device is mislabeled, contact Holley for a spring replacement.