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 Post subject: Gas Tank Rust
PostPosted: Tue Sep 06, 2011 1:38 pm 
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Location: Minneapolis, MN
Year and Trim: 2010 Dodge Ram SLT Big Horn
1995 Chevy Camaro Z28
Hey guys, just bought my '04 GXP with 72k on it, love the car! Having owned previous Bonnevilles, I know there is an issue with the rear 1/4 panel rusting due to the gas tank, and I was wondering what is the best sealant for closing off that seam from water entry? Is there some type of epoxy or caulking that works best? Also, I noticed a small hole almost right under the gas cap, should that also be filled with some kind of sealant?

I would like to keep this car for awhile and avoid the dreaded rust issue. Thanks for the help.

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1995 Camaro Z28 - LT1 w/ 6-speed, Magnaflow Exhaust, Moroso Cold Air Inake, Powerstop drilled/slotted rotors and ceramic pads, Z06 Chrome Wheels, Founders Performance Strut Tower Brace (Work in Progress)
2010 Dodge Ram SLT Big Horn Edition Quad Cab - 5.7L Hemi, 390HP, 4x4, Daily Driver

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1989 Acura Legend - 'Tank'
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2004 Bonneville GXP - 'Red Demon' - Already Missed

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 Post subject: Re: Gas Tank Rust
PostPosted: Tue Sep 06, 2011 1:40 pm 
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Joined: Thu Oct 21, 2010 2:42 pm
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Location: North Western Pa
Year and Trim: 2002 Bonneville SE
Welcome to the club.
Don't forget to post photos of your car.

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 Post subject: Re: Gas Tank Rust
PostPosted: Tue Sep 06, 2011 1:57 pm 
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Location: MN/IA
Year and Trim: '17 Silverado 1500
Welcome.

It's not because of the gas tank, and it's due to water leaking in the trunk behind it and causing issues. About the only thing you can do is keep the car leak-free. Don't fill that hole in the bottom, that's to allow the water to drain out when you drive in the rain, etc.

Some have filled the gaps with RTV or other sealants, etc. It's worth a shot. There's nothing that anyone on here recommends specifically.

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 Post subject: Re: Gas Tank Rust
PostPosted: Mon Sep 12, 2011 9:25 pm 
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Joined: Mon Jan 03, 2011 9:11 pm
Posts: 21
Location: The Redneck Riviera (Myrtle Beach, SC)
Year and Trim: 2005 GXP
The hole under your gas cap is a drain hole for when you overflow your gas tank. Don't fill that one. Do a search for a thread called, "help, my car's taking on water" or something very similar, there is an amazing writeup including pics.


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 Post subject: Re: Gas Tank Rust
PostPosted: Fri Sep 23, 2011 10:59 am 
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Joined: Wed May 13, 2009 10:45 pm
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Location: CHICAGO
Year and Trim: 2006 Cadillac STS-V, 2004 Pontiac GTO
The only way to really fix it is to take it to a body shop and have them fix it. In the process, they will remove the foam absorber/insulator behind the metal which retains the water/gas, which is the main culprit in the rust around that gas tank fill area. It affects most GM FWD cars.

Even after the fix, it isn't 100% gauranteed NOT to re-rust, but at least the chances are in your favor.

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Retired Bonneville Owner and former GM Tech:
2004 Pontiac Bonneville GXP: Black/Ebony *SOLD*

Summer Toys: Combined 827 RWHP / 877lb/ft RWTQ
2004 Pontiac GTO: Impulse Blue Metallic/Black/M6: lots 'o mods, 415 RWHP / 405lb/ft RWTQ!
2006 Cadillac STS-V: Light Platinum Metallic/Light Gray/A6 - Spectre CAI, Magnaflow exhaust, Speed Inc. tune, 412 RWHP / 472lb/ft RWTQ

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 Post subject: Re: Gas Tank Rust
PostPosted: Fri Sep 23, 2011 1:31 pm 
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Location: Toronto, Canada
Year and Trim: 09 G8 GT
On a related note, I saw my first pinhole-sized bubble yesterday :(

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Jerry /// Past: 95 SSEi (June 2010 COTM) -- 04 GXP (July 2011 COTM)
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09 Lexus LS460 AWD -- 94,000km -- Daily Driver
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 Post subject: Re: Gas Tank Rust
PostPosted: Fri Sep 23, 2011 2:16 pm 
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Joined: Wed Aug 17, 2011 2:15 pm
Posts: 94
Location: Clarkston, MI
Year and Trim: 1993 Bonneville SSE
Yeah those rust bubbles are showing on mine too! :banghead: Not sure how to take care of it. But im sure ill think of something. Good luck!

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Last edited by MARGR4V3Z on Fri Sep 23, 2011 2:18 pm, edited 1 time in total.

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