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Re: 2003 suburban cat. problem?
Hi there! The noise you are hearing is the normal sounds associated with a stainless steel gas tank. The '03 Suburban is a "flex fuel" vehicle, and can handle E85 Ethanol gas as well as the regular fossilized stuff. To handle the more viscous E85, a flex-fuel system has to utilize a stainless steel tank to stave off corrosion. This causes a metallic pinging to occur as it cools.
Hope this helps!
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