I'm getting a loud gurgling type pump noise when removing the fuel cap. It is really something I have never heard before on any vehicle. It's not a quick hissing noise. It is a constant motor type noise coming from the fuel filler. I tried it again today because the dealer was there, but since I have a 1/2 tank of gas it did not happen.

Each time I have needed to fuel up, I've heard it. So I suspect this noise occurs when the tank is low...within 3-4 gallons left.

Has anyone else heard this?

 

I have heard it on my GX, just figured it was a Lexus thing.

 

hiss ive heard, but not the not the noise youre concerned about. is it the fuel system doing its check?

 

To clarify, this happens when the truck is running. Maybe it is a fume safety pump?

 

I did some Googling and found this.
http://www.toyota-4runner.org/5th-ge...-gas-tank.html