Fuel Tank Vent

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Dec 1, 2024 | 09:14 PM

Scottay

Thread Starter

Mountain Pass

Joined: Jun 2004

Posts: 133

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From: Massachusetts

Fuel Tank Vent

I have a new to me 2019 F350 6.7 diesel, this is my 3rd ford diesel. On this one when I remove the fuel cap it sucks in air, the other 2 didn’t do that. My 1st was a 2010 (6.4), 2nd was a 2017 (6.7). Ford says that level vacuum is normal (no codes) doesn’t seem it to me though, any thoughts?

Dec 2, 2024 | 06:23 AM

BPTS

Tuned

Joined: Aug 2024

Posts: 288

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Because Diesel’s suck?*

* flame suit on- fire away

Dec 2, 2024 | 07:31 AM

B-ManFX4

Fleet Mechanic

Joined: Feb 2021

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From: East TN

My 2019 F-350 6.7 does not do that. Are you sure it is vacuum and not pressure ?

Dec 2, 2024 | 08:15 AM

OBS460

Logistics Pro

Joined: May 2022

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From: Everywhere and nowhere

There have been 6.7 owners pulling heavy have the poly tanks suck in on themselves.

Dec 2, 2024 | 08:34 AM

acdii

Lead Driver

Joined: Feb 2022

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Since diesel doesn't evaporate like gasoline does, it doesn't have an emissions system like on Gas tanks. It has a rollover valve on the top of the tank to equalize pressure. IIRC its on the top rear of the tank. It's suppose to allow air in to offset fuel used.

Dec 2, 2024 | 12:00 PM

Scottay

Thread Starter

Mountain Pass

Joined: Jun 2004

Posts: 133

Likes: 14

From: Massachusetts

Definitely a vacuum.

Dec 2, 2024 | 02:13 PM

Ltngdrvr

Lead Driver

Joined: Nov 2005

Posts: 8,459

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Quote:

Originally Posted by Scottay

Does it have the original fuel cap on it?
Believe they are vented on a diesel, so maybe has the wrong cap.

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Dec 5, 2024 | 07:08 AM

Scottay

Thread Starter

Mountain Pass

Joined: Jun 2004

Posts: 133

Likes: 14

From: Massachusetts

New cap, no difference. Where the vent for these tanks can’t find any info online about them.

Dec 5, 2024 | 10:46 AM

#10

acdii

Lead Driver

Joined: Feb 2022

Posts: 7,965

Likes: 4,042

This is on a Titan tank, but stock should be similar, This tank shows 2, one by the fill and overfill tubes, which is I think where stock is and another one near where the water separator goes.