Where is the cabin filter on a sierra 2004 gmc sle crew cab truck

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Behind glove box or under front cowl-front of windshield w wiper motor area

The relay is either under the hood in fuse box or in fuse box on leht side of dashA thumbs up would be greatly appreciated if this answer is helpful to you.

its probably an in tank filter. look for accsess to fuel pump through a plate in the boot or under the back seat some cars theres need to drop the fuel tank to accsess the pump/filter assy

Under the truck, on drivers side, between fuel tank and engine compartment, sort of under where the drives sit, against the frame.

You may be lucky and the fuel filter is still on the inside frame rail under the drivers door. 2004 was the change off year and 2005 was defiantly the no serviceable fuel filter.
You can go to the dealer with your vin number and they can look up in there system if you have the external fuel filter, or you can just look for it on the inside of your frame rail.
Thank you for using fixya and be safe.

Fuel filter is located on the inside frame rail under the drivers door. To disconnect the fuel filter, you need a quick fuel line release wrench.

Thank you for using fixya and good luck.

check under the hood in the wiper cowl, should be an access panel. if not check behind the glove box.

if you don't see it along the left frame rail just ahead of the tank then it is in the tank

give it a complete tune up and change the fuel filter if that does fix it then check for a vapor lock and bad fuel pressure regulator