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Fuel Cell vent routing

spalind

Well-Known Member
Can I have some critique on this routing? I believe I will need a longer vent line as doesn't it need to go the way it is going but come back down below the fuel cell for where it terminates?

45367167_10155582132327651_6767849168267378688_o[1].jpg
45367167_10155582132327651_6767849168267378688_o[1].jpg
 

y2kbaja

Well-Known Member
And the vent should go higher than the highest part of the filler (it does now but it doesn’t look like a filler neck is installed yet)


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Chubs

Well-Known Member
Is that in the back of the Nissan? I thought fuel cells weren’t required so long as you were using a stock gas tank in the stock position?
 

Dirtracer 619

Well-Known Member
I think your vent line is to small. May have trouble filling fast Will think its full but it wont be imo.
If your not racing no biggie


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spalind

Well-Known Member
Is that in the back of the Nissan? I thought fuel cells weren’t required so long as you were using a stock gas tank in the stock position?
In rally, yes, the stock is fine...I'm modifying my truck to be both rally and desert compliant
 

spalind

Well-Known Member
I think your vent line is to small. May have trouble filling fast Will think its full but it wont be imo.
If your not racing no biggie


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The line with the filter on the end, yes? Is it possible to connect a larger line to that fitting?
 

85yota

Well-Known Member
The entire vent line is too small. 3/8 or even 1/2" line won't take a dump can or even a gas station pump at full speed. I modified my fill plate to accept a 1" ID hose. Now I can fill as fast as I can.
 

spalind

Well-Known Member
The entire vent line is too small. 3/8 or even 1/2" line won't take a dump can or even a gas station pump at full speed. I modified my fill plate to accept a 1" ID hose. Now I can fill as fast as I can.
How on earth do you have a 1" hose attached to a little fill plate? Photo?
 

Zambo

Well-Known Member
Ya put a bigger fitting in the fill plate. Now if you're just gonna fill it with a fuel nozzle from a pump, all you need is a gap around the filler neck and the small vent will be fine for compensating for fuel usage when driving. But you need a big diameter vent if you're going to fill it with a quick dump can. Heck, even a street car has a 5/8" or so vent line that goes back to the filler neck.

I always imagine that the fuel cell has four sides and a top and a bottom. The vent line should extend past each one of these six sides at some point so no matter which way the truck lands, there is a part of the vent line that is higher than the cell. Probably not likely that your truck ends up standing vertically after a roll but generally its not that hard to route the line in this manner.
 

jon coleman

Well-Known Member
3/4 min, one loop around & down aimed away from any thing sparking or hot, lights , brakes,exhaust, then i attach a ph2 oil filter , louver about3 1/4" slots on filter can, facing down , that way it vents pretty good even after a mud bath.that little k& n plugs up quick in the dirt, that issue has befuddled many a racer...race on
 
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