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Fuel tank - Vent or not to Vent?

freightguy

freightguy

Active member
I am wondering if anyone has disabled the vent. I only ask because I lose a lot of fuel to evaporation. Or is there a check valve type product that I can add to the vent to stop evap?

Thanks,
 
If you don't have a vent of some type you will end up with engine performance issues.
Also could cause a issue if the tank builds excess pressure when sitting and not in use.
 
RNGRDVE said:
If you don't have a vent of some type you will end up with engine performance issues.
Also could cause a issue if the tank builds excess pressure when sitting and not in use.
Click to expand...

Thanks. Is there something that can stop the fuel loss?
 
Definitely leaking and that fuel is then evaporating. You do Not want to put a shut off valve in the vent. could lead to a dangerous situation.
 
Not to hijack the thread, but I don't think I have avenged tank. (Just a vented fuel cap) when I fill the boat at the pump it doesn't take much and it starts spitting and chugging fuel back out. Has to be fueled very slowly! Would adding a vent on the tank perhaps help this? Has anyone done this?

2001 pulsare 2100
 
All tanks should be vented. If you do not have one, you should add one. If you do have one, it may be blocked/clogged. The other issue I have had in the past- Both the fill and vent were in the rear of the boat and when filling with the boat on an incline, the fuel level in the tank would rise until it blocked the vent. I would not be able to get the last few gallons in unless the boat was level or slightly down hill. I found my go to gas station and filling angle and that was the only place I would go.

First step would be to check the boat/tank for a vent fitting. The vent is usually located near the fill. If you do not have one, add one. If you do, check the vent hose and fitting to make sure it does not have a blockage.
 
Blkcorvair said:
Not to hijack the thread, but I don't think I have avenged tank. (Just a vented fuel cap) when I fill the boat at the pump it doesn't take much and it starts spitting and chugging fuel back out. Has to be fueled very slowly! Would adding a vent on the tank perhaps help this? Has anyone done this?

2001 pulsare 2100
Click to expand...
it's vented, might ck to see it a spider plugged it up, sometimes the way the filler hose is routed or kinked will cause that as well
 
Hack said:
Is your neighbor drive more???? :rof:
Click to expand...

Believe me I had wondered. I just filled the tank, no visible leaks so far by tilting the seating up. I am going to finish lunch and go take the seat out so I have full access to the tank.
 
Maybe the fuel gauge registers low when the system is first turned on? Fuel tank is vented and must stay so. Fuel leaks in a boat or aircraft can be oh so much more disastrous than a road vehicle. Coast Guard Regs have a bunch to say concerning fuel tanks too. I'm hoping for a no leak situation.
 
Oh, I forgot to add not only the old EPA stuff regarding fuel tanks, but some of the new stuff too.
 
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