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What Is This Items Function Please?

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Old Dec 12, 2024 | 09:52 PM
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What Is This Items Function Please?


Pardon the shortcut I'm taking with this inquiry, I could probably get to it tomorrow, but I just thought I'd ask.
It is living right behind the driver's seat, on the floor...I'm not sure sometimes if it's Ford or the Fire Truck Manufacturer...

Thank you,

Landon
 
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Old Dec 12, 2024 | 10:44 PM
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Appears to be the vent for the hydrovac booster on the frame below the cab. See if there's a hose connecting it to the booster.
 
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Old Dec 13, 2024 | 03:43 PM
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Yes, it does go to the booster after emerging through the firewall and going to a junction. Also appears to be joined by a line coming off the intake manifold someplace.




Thank you.

Landon
 
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Old Dec 17, 2024 | 07:32 AM
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Consider posting all of your truck's questions in a single thread. Months or years later, it'll make a lot more sense to readers -- because they'll have access to the complete truck info, not just "F700" -- and also easier for you to reference.

Originally Posted by hunts318
Yes, it does go to the booster after emerging through the firewall and going to a junction. Also appears to be joined by a line coming off the intake manifold someplace.
The white hose junction on the firewall is a vacuum check valve for the under-cab hydravac booster. One hose to the intake manifold, one to the booster, and the smaller one to your dash-mounted vacuum gauge.

It does not connect the the vent cover/filter under the seat; when you track the hoses, you'll find the vent line has its own connection to the booster.


More info (for older series) is here and here.
 
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