mystery hose

[markasanders]

On the drivers side , next to the wheel well...
Anyone shed a light on what hose this is?
I think the one with the cap is tranny or fuel return vent?

 

[markasanders]

Picture is looking down into the engine.

 

[Sparksalot]

On the drivers side , next to the wheel well...
Anyone shed a light on what hose this is?
I think the one with the cap is tranny or fuel return vent?

View attachment 434547

Extension for the front differential breather?

 

[OR VietVet]

That does not look like a factory zip tie mount. If the other hose is a vent, I would guess a vent for something, like @Sparksalot suggested. Have you not followed it to the other end?

 

[Joseph Garcia]

Welcome to the Forum from NH.

Lots of knowledgeable folks here who freely share their knowledge, experiences, and perspectives. Knowledge is power.

I hope that you will become a participating member in the Forum's discussions.

Pics of the truck, please.

You are already receiving sage advice from the knowledgeable folks on this Forum.

Please provide us with the truck's year, model, and trim, as this may help folks here help you.

As @OR VietVet asked, where does the other end of this mystery hose go?

 

[swathdiver]

I bet that they replaced the original vent at the differential and left the old one next to it. They are both vents, probably from the front axle and maybe to include the transmission but that's usually on the other side.