Located on the driver side looks like an oil filter. For the fuel filter you can use Wix, Fleetguard, Stratapore, and Baldwin. For my 94 12 valve I have a fuel pressure gauge and when it starts dropping I change it. I would highly recommend a Fass or Air Dog system. If you don't drive it very often you can change it 2 times a year at every 6 months. Power Service Diesel Kleen is the best diesel fuel additive period! I use it at every fill religiously, it lubricates the entire fuel system, boost cetane numbers by 6 to 8 percent, cleans dirty injectors, prevents injector sticking, less down shifting, smoother running engine, and helps with dry starts. Better to use it at every fill up to really see and gain the benefits of this diesel fuel additive. It also helps if you get a hold of some bad diesel that is contaminated. In the summer I use the silver grey bottle, for winter white bottle helps with fuel from gelling up when temperatures are below freezing.
