Fuel cell venting

Eddyj · Dec 30, 2017

Stupid question time: you run you vent line and some fuel splashes up into the vent line. If the line goes down and then back up or has a dip in it, the fuel will sit in the low spot and block the vent line until it has enough positive or negative pressure to push/suck fuel.
I had a bad smell coming from tank, ended up being a couple of oz of fuel that had been sitting in the low spot.

Side note what diameter hose?
A very narrow hose should work just as good, I would think. :dunno:

d_daffron · Dec 30, 2017

If you add one of those clear plastic parts store fuel filters to your vent it will cut down on the fume smell.

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The Luke · Jan 17, 2023

Bringing this back. I'm putting a fuel cell in my rig. I watched burkey's two videos on vent line routing and the theory changes between videos. Thoughts? Ideas?

On both do the drawn examples below it will go down behind the tank and rollover valve below the floor board.

Bebop · Jan 17, 2023

Both are fine.
If you do the wrap around the cell, make sure the loops on each side are past the fuel cell walls.

ToyotaTom · Jan 17, 2023

I do the up, around and down option.

paradisepwoffrd · Jan 19, 2023

Either way, I think the rollover valve still stays on the tank vs the end of the hose, correct?

ridered3 · Jan 19, 2023

ToyotaTom said:
I do the up, around and down option.
View attachment 208643

How's that routing holding up? I know you've been on your side a time or two :driving:

ToyotaTom · Jan 19, 2023

ridered3 said:
How's that routing holding up? I know you've been on your side a time or two

Its works real good LOL. Some fuel gets into the vent when upside down but not all the way out.

TMac · Jan 19, 2023

Eddyj said:
Stupid question time: you run you vent line and some fuel splashes up into the vent line. If the line goes down and then back up or has a dip in it, the fuel will sit in the low spot and block the vent line until it has enough positive or negative pressure to push/suck fuel.
I had a bad smell coming from tank, ended up being a couple of oz of fuel that had been sitting in the low spot.

Side note what diameter hose?
A very narrow hose should work just as good, I would think.

Too small of diameter hose and you will starve the pump. As pump "pulls" the fuel, you have to replace it with air fast enough to not create a vacuum. Most use the same diameter hose for the fuel pump and the vent