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vacuum in fuel tank

Yahoo Message Number: 34545
When I remove the fuel tank filler cap there is a loud "rush of air" noise, especially if the tank is near the 1/4 mark and I have been on the road for several hours. Is this normal? Haven't notice any engine performance issues.

Thanks for any info/advice.
Ken

'04 Allure 31042

Re: vacuum in fuel tank

Reply #2 –
Yahoo Message Number: 34547
We had a similar problem. First check the vent. They often cover it with undercoat. Next open the inspection cover in the first bay, and look at the top of the vent line. Ours was plugged with a "flap" of metal where they cut the line and didn't de-burr the cut.

Ours was so bad the engine would sag under heavy load and a very LOUD bang would occur when the pressure was equalized.

Jim

07 Allure #31570

Quote from: Don Seager
Ken,

I have a 2004 Allure 31046 and it has always done this. On my
fuel caps it says Stant Vacuum Only aside from some warnings about spraying fuel. This leads me to believe that the fuel tanks are supposed to be under vacuum but I have never inquired about it.

Quote
>

Don Seager

When I remove the fuel tank filler cap there is a loud "rush of

air"

Quote
noise, especially if the tank is near the 1/4 mark and I have

been on

Quote
the road for several hours. Is this normal? Haven't notice any

engine
 

Re: vacuum in fuel tank

Reply #3 –
Yahoo Message Number: 34559
I think this is normal. My last and present coach did/do this and both my cars do too.

Larry 03 Allure 30856

Quote from: Don Seager
Ken,

I have a 2004 Allure 31046 and it has always done this. On my
fuel caps it says Stant Vacuum Only aside from some warnings about spraying fuel. This leads me to believe that the fuel tanks are supposed to be under vacuum but I have never inquired about it.

Quote
>

Don Seager

When I remove the fuel tank filler cap there is a loud "rush of

air"

Quote
noise, especially if the tank is near the 1/4 mark and I have

been on

Quote
the road for several hours. Is this normal? Haven't notice any

engine