Additive Spill

A10MileHusker · Apr 22, 2026

I went to add some HotShots EDT before a fill-up, and put it in the tank, and then saw that it was coming out from under the truck.

Does anyone know what I'm doing wrong? Is there an overflow I need to get past? I was just using the additive bottle to add it.

Thanks!

2024 White Tahoe · Apr 22, 2026

A10MileHusker said:
I went to add some HotShots EDT before a fill-up, and put it in the tank, and then saw that it was coming out from under the truck.

Does anyone know what I'm doing wrong? Is there an overflow I need to get past? I was just using the additive bottle to add it.

Thanks!

Was the bottle designed to be used with a cap-less fuel fill?

Did your vehicle come with the the cap-less fuel fill?

Hey you · Apr 22, 2026

That is what it sounds like. You can improvise with a funnel and some rubberized tubing.

BlackHC2025 · Apr 22, 2026

These work for me. One for DEF and one for additive.

https://www.amazon.com/dp/B0D14FHKKN?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_4&th=1

StephenPT · Apr 23, 2026

There's two flaps inside the fill neck. You need a long spout funnel that will push open both flaps.

I have a couple of these - one marked "DEF" and the other marked "diesel fuel conditioner" - https://www.walmart.com/ip/Hyper-To...uid-Plastic-Funnel-Blue-10732WRHT/17927020935

Padraig · Apr 23, 2026

Just use the funnel that comes with the vehicle.

Padraig

Stbentoak · Apr 23, 2026

Yes, Or Transmission funnel. Most of my vehicles had a funnel included for additives or big rig nozzle adaptation in an emergency.
Never have needed one for def as the Walmart nozzle goes right down in the hole as well as any DEF pump nozzle.

Additive Spill

A10MileHusker

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2024 White Tahoe

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Hey you

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BlackHC2025

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StephenPT

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Padraig

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