hearing a noise from under truck after turning it off

Asked by Mar 03, 2014 at 03:55 PM about the 2002 Chevrolet Silverado 2500HD 4 Dr LS 4WD Extended Cab SB HD

Question type: General

when a can is left in full sun its makes a popping noise, that's the sound I am hearing from under my 2002 Chevy Silverado 2500 HD series, after I shut it off.    - As of last night there is a high pitched shrill  sound coming from my gas tank when I am idleing, its driving me crazy, what could be happening?

1 Answer

275,605

The pinging is probably the exhaust contracting and expanding. The shrill you hear is probably the fuel pump ready to fail.

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