Fuel cell venting

Jduck · Jan 5, 2016

Will this be adequate to vent the tank and not leak gas? Comes out of tank, down pass side, across bottom, up driver side, across top then back down pass side?

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clemsonjeep · Jan 5, 2016

Only needs to come up to that driver rear corner...the rest is overkill. Just imagine turning the vehicle every direction...if theres always a section of line above the outlet at the cell you're good to go.

pholmann · Jan 5, 2016

Watch that first tech video with jake burkey. It'll show you how. Those are awesome.

Jduck · Jan 5, 2016

clemsonjeep said:
Only needs to come up to that driver rear corner...the rest is overkill. Just imagine turning the vehicle every direction...if theres always a section of line above the outlet at the cell you're good to go.

Well part of the thought of across and down again was that if it was going to leak it would be going away possible back seat passangers instead of pouring on them. Technically it should go forward then, if it got stood up on its back then it would pour out.

pholmann said:
Watch that first tech video with jake burkey. It'll show you how. Those are awesome.

A buddy routed his that way and it was wet with gas after a day of riding at the outlet, no rollovers.

RustyC · Jan 5, 2016

If would leak if the rig is on its rear/ tailgate.
If it were mine I would route like this.
From the tank to the passenger c pillar/ belt line node (near the clamp) then forward up the belt line tube to the harness bar, then turn to the drivers side to the drivers belt line tube, then back to the driver c pillar node then turn down and go a few inches below the floor in the corner by the ratchet. The hose would be clamped, tied whatever on the inside of the belt line and would not get hit by rocks and look clean
Long story short around the tank up high down through the floor.

pholmann · Jan 5, 2016

Jduck said:
A buddy routed his that way and it was wet with gas after a day of riding at the outlet, no rollovers.

Good to know. :dblthumb:

RustyC · Jan 5, 2016

Three sides and down is the rule.

Bebop · Jan 7, 2016

Look at this link : http://www.pirate4x4.com/forum/general-4x4-discussion/243815-fats-fuel-air-trap-system.html

I think it's pretty good.

Rjhoward32006 · Jan 7, 2016

Why not run something like this

screamn56 · Jan 7, 2016

If ur not just right those will leak fuel. :****: just ask me how I no

Jduck · Jan 7, 2016

Rjhoward32006 said:
Why not run something like this

Are those not the same as the roll over valve already on the tank, a little ball that blocks the passage when rolled over?

Rjhoward32006 · Jan 7, 2016

You are correct, i guess it depends on the tank. I dont think mine has one.

screamn56 said:
If ur not just right those will leak fuel. :****: just ask me how I no

What would the incorrect or correct way to make this work correctly

sleepsontoilet · Jan 8, 2016

RustyC said:
Three sides and down is the rule.

This, except I ran mine on the cell not the chassis.

hjpcummins · Jan 8, 2016

Re: Re: Fuel cell venting

sleepsontoilet said:
This, except I ran mine on the cell not the chassis.

Just curious, what's with the shut offs..stored in garage ?

Jduck · Jan 8, 2016

Re: Re: Fuel cell venting

hjpcummins said:
Just curious, what's with the shut offs..stored in garage ?

Racing requirements

ranger11 · Jan 9, 2016

Re: Re: Fuel cell venting

Rjhoward32006 said:
You are correct, i guess it depends on the tank. I dont think mine has one.

What would the incorrect or correct way to make this work correctly

You pretty much have to be upside down to get the ball all the seated. When it's full fuel will splash out. Least mine did on the tank mounted rov.

Rjhoward32006 · Jan 10, 2016

Is there another way doing this the running a fuel hose all over the place? I just dont like the looks of a bunch of hose everywhere

clemsonjeep · Jan 11, 2016

Not really...the way sleepsontoilet did his is about as clean as you can get and be effective. You have to have air between the end of the hose and the tank...or it will leak. The way those rollover valves work is the ball bearing has to be completely seated in order to block the fuel. So like they said you'd have to be on your roof and the valve would have be perfectly straight up and down in order for it to seal.

Jduck · Jan 11, 2016

Ending up doing this, around the top then down and out the pass side on the other side of the ammo can

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Ricky 79cj-7 · Jan 12, 2016

Rjhoward32006 said:
Is there another way doing this the running a fuel hose all over the place? I just dont like the looks of a bunch of hose everywhere

On my stock CJ tank I drilled a couple holes and ran the fuel hose up through my b pillar across and down the other side. My thoughts were that I didn't want a fuel line spraying fuel all over me if it were to get a hole in it.

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:

doubleud · 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::rolf:

ToyotaTom · Jan 19, 2023

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

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. :dunno:

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