vacuum in the fuel tank
#1
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Join Date: May 2010
Location: Mountain Home ID
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vacuum in the fuel tank
everytime when i fill up, i take off my fuel cap and i have a vacuum in my tank. i bought a new cap, and still the same thing, to temperarily aleviate the problem i took off the rubber O-ring on the fuel cap.
does my tank have some sort of blockage, is there a fuel line that is plugged?
does my tank have some sort of blockage, is there a fuel line that is plugged?
#3
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The tank is vented by two sources, the cap and a vent on the tank module.
Both are designed to hold 3 psi of vacuum or pressure.
You should hear a hiss if everything is working correctly.
Tank vent is the one labeled remove the red cap below
Both are designed to hold 3 psi of vacuum or pressure.
You should hear a hiss if everything is working correctly.
Tank vent is the one labeled remove the red cap below
#6
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I checked mine by pulling it out and blowing through it. The rollover valve/vent as Infidel showed a picture of is just a grommnet fit, tight but it will come out. I cant remember if it is a one way valve or if it has to be in a certain orientation (like upside down for the rollover valve to work (block the flow). I just held it in the same postion as it would be mounted on the tank, right side up and blew through it. Air went through so I assumed it worked fine. Thats how I was told to verify its operation.
#7
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I checked mine by pulling it out and blowing through it. The rollover valve/vent as Infidel showed a picture of is just a grommnet fit, tight but it will come out. I cant remember if it is a one way valve or if it has to be in a certain orientation (like upside down for the rollover valve to work (block the flow). I just held it in the same postion as it would be mounted on the tank, right side up and blew through it. Air went through so I assumed it worked fine. Thats how I was told to verify its operation.
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#8
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I had my tank down for another reason so it was dropped when I took it out, I also had the tank module out of the tank as well so it was not hard at all at that point. You might be able to get it out without dropping the tank but it is tight up there. I believe there is clearance for it to come out it is probably more a question of whether you can get it out with the room available.
#9
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everytime when i fill up, i take off my fuel cap and i have a vacuum in my tank. i bought a new cap, and still the same thing, to temperarily aleviate the problem i took off the rubber O-ring on the fuel cap.
does my tank have some sort of blockage, is there a fuel line that is plugged?
does my tank have some sort of blockage, is there a fuel line that is plugged?
#10
So what can happen because of this fuel tank pressure? I too have pressure in my tank when removing the cap to refuel. Been doing this for years. I just thought it was supposed to do this or it had something to do with the fass pumping so much fuel. My Chilton book shows a hose on the tank vent. I guess I can check this for blockage. What else can cause this?
#12