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Where ia the Fuel pump relay on a 2003 gmc Yukon XL?

The fuel pump relay location on a 2003 GMC Yukon XL is in the underhood fuse block, specifically within the Power Distribution Center (PDC). It's *not* typically in the interior fuse box.

However, you'll need to consult your owner's manual or a wiring diagram to pinpoint the exact location within the PDC. The relay itself might be labeled, or you may need to use the diagram to identify it based on its circuit function. The diagram will show the relay's location and what number it is. Don't rely solely on general online advice as relay positions can slightly vary between model years and trim levels.