Where do you find the fuelwater separator on a f350?

The location of the fuel/water separator on a Ford F-350 depends on the year and engine. There isn't one universal location. To find it, you'll need to consult your owner's manual or a repair manual specific to your truck's year, make, and model (including engine type - 6.2L gas, 6.7L Power Stroke diesel, etc.).

Generally, on diesel F-350s, it's more likely to be a readily accessible filter, while on gasoline models, it might be integrated into other fuel system components and less easily identifiable as a separate unit. You might find it near the fuel tank or along the fuel lines.

In short: Check your owner's manual. That's the only reliable way to know for sure.