Some of my recent 7.3 PSD mods...

[GasSavers_SD26]

Apparently, over time, the Fuel Pressure Regulator (FPR) screen has an orifice that gets loaded up, and that results in lower MPG. I got a new screen to replace the old one, as I'm assuming that it's original with 252k on it.

Additionally, I shimmed the spring for the FPR. Supposed to improve idle, some noise problems, maybe help out too on the MPG side? Unsure, but it might reduce some of the air that can get built up in the fuel system, and that can improve combustion.

Replaced the fuel filter while I was there also. I am now on my "rinse" phase of the product Auto RX also. Again, with 252k, I'm hoping that the inside might need a long, slow cleaning that Auto RX is supposed to provide. The cleaning phase takes about 2500 miles, the rinse phase takes 3000. Might go ahead and run a second clean & rinse after this.

Mileage has been on a downward drop for a couple years, and I have never dropped as low as it has been this year. I'm hoping some of these issues will bring it back up, or show me that some of the local biofuels are causing me some reduced mileage.