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KELMO

Manure

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Your pics are nice!

 

We took a ride in the mountains today with a group of German car enthusiasts as well, had a great time other than I forgot to bring my camera. The Aspens aren't changing yet so all I missed was cool car pics. There was an older woman in the group with an Audi RS5, that car is fast and she could drive too!

Edited by goes2fast

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On 9/12/2020 at 3:38 PM, KELMO said:

 I am thinking gas cap vent....maybe.

 

Could well be, especially on a very hot day. 

 

Easy to check, if it does it again. Just pop the cap off when you hear it. 

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Verified.

Yeah, that happened.

Remote diagnosis, you get 10,000 interwebs points.

 

The points don't matter but you still get 'em.

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  • Haha 1

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On 9/14/2020 at 9:19 PM, KELMO said:

Verified.

Yeah, that happened.

 

Did you remove the vent tank thingy at some point? This should only happen if the tank is not properly vented...

 

Well, and if it's hot as hell outside...  😁

Edited by datsunfreak

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Hot as hell outside is the case.

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On 9/17/2020 at 4:55 PM, datsunfreak said:

 

Did you remove the vent tank thingy at some point? This should only happen if the tank is not properly vented...

 

Well, and if it's hot as hell outside...  😁

Very technical bro.😀

 

So, the vent tank thingy....there is one in the engine compartment that vents vapor back to the tank. Pretty sure I replaced that (could have been the grey car tho). The big cannister in the right rear corner is still the original and is hooked up. (on both coupes)

I also seem to remember stopping for gas and getting that whoosh sound upon removing the gas cap. Now the question is was it this car or the grey car...or both? I honestly couldn't tell you.

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The flow guide valve??? A hose to the air filter, the crank case vent tube behind the exhaust manifold and one to the gas tank.

 

Engine off. On hot days, fuel evaporated in the tank build a very small pressure and push past the flow guide valve and are directed into the crank case for storage.

 

Engine on. Intake vacuum draws stored gas fumes from the crank case through the PCV valve and are burned. As the fuel is emptied from the tank a slight vacuum condition is caused opening a port in the flow guide valve that allows filtered air from the air filter back into the tank to replace the used gas.

 

For this to work properly it has to be a closed system and a sealed gas cap is used. Zero evaporated hydrocarbons escape into the atmosphere..

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