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2017 GMC Denali 2500HD, 3.5" Rough Country Lift, 305/55R20 Cooper Rugged Trek, Paragon Bed Cover
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First, welcome to the forum.

Second, stop spraying ether in it.

You said the fuel tank was cleaned out; does it have fuel in it now? I know it's a dumb question, but I've spent more time troubleshooting fuel systems with empty fuel tanks than I'd like to admit to.

Next check that the fuel filter is primed. Back near the firewall on the passenger side is the fuel filter. You can access the primer button from top of the engine compartment. The primer button is a big, obvious button that you can push on top of the filter housing. If you push on that, is it firm or soft? If it's soft, then you need to prime it up. Open the bleeder screw next to the primer button and pump that button until fuel comes out the screw. Once it does, pump one more time and hold down the primer button while you tighten the bleeder back up so air doesn't re-enter the system.

Try and fire the truck and see what happens.
 
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