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I’m installing an auxiliary tank with a gravity feed to the fill tube. I’m pretty sure the fill tube is 1 3/4” however I’m trying to confirm that before I order it. I have a 2020 3500 long bed DRW. It looks like GM changed the fill tube for the 2020. Can someone confirm or give me the correct size of the fuel fill tube?
 

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If you have the truck already use a caliper and measure it
 
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I didn’t realize this was the 1/2 ton thread. Thanks for the help.
Welcome to the forum.

LM2 is order code for the 3.0L dmax in the 1500's.
25/35's 2016 and newer run the L5P version of the 6.6 dmax
25/35's 2020 and newer are still L5P, but they have the new body/chassis and the 10 speed allision
 
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