[Knoordzy]

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?

 

[sambor]

If you have the truck already use a caliper and measure it

 

[Knoordzy]

If you have the truck already use a caliper and measure it

I couldn’t find mine earlier so I was going in the morning to borrow one. Thanks

 

[tdhanses]

1 1/2” on the LM2, I just installed mine a month ago, might get better responses in the other threads outside of the 1/2ton threads.

 

[Knoordzy]

1 1/2” on the LM2, I just installed mine a month ago, might get better responses in the other threads outside of the 1/2ton threads.

I didn’t realize this was the 1/2 ton thread. Thanks for the help.

 

[redwngr]

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