Do you need to somehow depressurize the fuel system on a 1993 s-10 blazer replace filter?

No, you generally do not need to depressurize the fuel system on a 1993 S-10 Blazer to replace the fuel filter. The fuel pump in these vehicles is usually electric and only runs when the engine is cranking or running. Therefore, the fuel pressure is automatically relieved when the engine is turned off.

While some residual pressure might remain in the lines, it's usually minimal and not enough to cause a problem during a fuel filter replacement. However, it's always good practice to:

* Disconnect the negative battery terminal before starting any fuel system work as a safety precaution.

* Wear safety glasses to protect your eyes from fuel spray (though unlikely in this case).

* Have rags handy to soak up any spilled fuel.

Use caution when working around fuel lines and components, but depressurization is usually unnecessary for a fuel filter change on this vehicle.