Chey 2000 silverado

[richram]

Hello fellow forum readers I just ran into a problem just had my rear tire patched & now im hearing some kind of air leak by the gas tank never heard this before but I can hear a hissing like air leaking is something going out I have half a tank of gas just I thought I had another air leak in my tire again right next to my drivers side rear tire any ideas would be greatfull thanks richram

[silveradoHO]

Have you checked the tire to make sure there is no leak?

[richram]

Yes it only makes the noise when the truck is started
thanks richram

[whitetrash982]

maybe the fuel pump whine and just never noticed it before?

[wrparks]

Yea, I'm thinking fuel pump too. Go stand beside the gas tank and have somebody turn the key on and off a few times without cranking the truck. See if you hear the same noise.

[richram]

thanks good ideas I will check it out thanks for the ideas Richram

[MT-2500]

Remove gas cap and see if you can still hear it.
If not.
Give that gas cap 3 clicks.
MT