“Whoosh” from gas cap and noise inside cab? (1 Viewer)

[85roktoy]

Should a properly vented factory 77 tank make a whoosh sound when you remove the gas cap?

Also getting a buzzing noise inside cab coming from the area above tank where all of the vent tubes run. Will buzz about 10 seconds then quit. Happens randomly while driving. Any ideas?

 

[JohnnyC]

When u say properly vented do you mean that you still have evap system installed?

My gas cap is properly vented however my evap is long gone

 

[JohnnyC]

Engine? Fuel pump mechanical? Charcoal canister?

 

[MDH33]

Ethanol evaporating. Old carbs and fuel systems not designed for it.

 

[85roktoy]

2F with sniper and mechanical fuel pump. Same things occurred with factory carb.

 

[hobbes]

Yes, you should get a slight whoosh removing the fuel cap as the EVAP check valve is designed to hold a slight pressure in the tank.

 

[85roktoy]

Lucked up and caught the buzzing noise on video. Vehicle not running but about 5 mins after I shut it off. Trying to post it now…

 

[85roktoy]

 

[DangerNoodle]

Sounds like my sniper pump, if you are running an in-tank pump.

 

[ToyotaMatt]

 

[Skreddy]

I had a skidoo snowmobile with 1 way valves for the gas tank venting and one was bad and made that identical noise.

 

[85roktoy]

No In tank pump. I’ll replace the one way valve and see if that’s the culprit.

 

[ToyotaMatt]

No In tank pump. I’ll replace the one way valve and see if that’s the culprit.

this one way valve ?


- you never mention what direction the " WHOOSH is going or coming from ?

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[85roktoy]

Yes that one Matt. Woosh sound is when taking off gas cap. Guessing pressure built up inside?