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Where is the fuel switch valve located on a 1974 Chevrolet C-10 pick-up?

A 1974 Chevrolet C-10 pickup truck does not have a fuel switch valve in the same way some modern vehicles do. There's no single valve you flip to switch between tanks (if it's a dual-tank model).

Instead, if it's a dual-tank model, the selection is done via a selector switch (often a rotary knob) usually located on the dashboard. This switch activates the fuel pump for the selected tank. There's no separate valve; the switch controls electrical power to the appropriate pump.

If it's a single-tank truck, there's no such switch or valve.

If you're troubleshooting fuel delivery, focus on the selector switch (if applicable), the fuel pump, and fuel lines.