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Bill3558
Joined: 12 Jan 2007
Posts: 121
City/Region: RIchmond Hill, Georgia
State or Province: GA
C-Dory Year: 2006
C-Dory Model: 22 Cruiser
Vessel Name: Pluto
Photos: Pluto
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 Posted: Mon Aug 13, 2007 12:43 pm Post subject: Rusting Gas Caps? |
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On my boat the stainless gas caps have a light rust on the surface. I have cleaned and polished them but it always comes back in a day or so. The water cap on the other hand is perfect.
The boat is kept in the water with shore power plugged in. I wonder if its some kind of weird electrolysis or something.
Any thoughts would be appreciated.
Bill, Beth and Pluto |
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Sea Wolf
Joined: 01 Nov 2003
Posts: 8650
City/Region: Redding
State or Province: CA
C-Dory Year: 1987
C-Dory Model: 22 Cruiser
Vessel Name: Sea Wolf
Photos: Sea Wolf
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| Posted: Mon Aug 13, 2007 1:07 pm Post subject: Re: Rusting Gas Caps? |
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| Bill3558 wrote: | On my boat the stainless gas caps have a light rust on the surface. I have cleaned and polished them but it always comes back in a day or so. The water cap on the other hand is perfect.
The boat is kept in the water with shore power plugged in. I wonder if its some kind of weird electrolysis or something.
Any thoughts would be appreciated.
Bill, Beth and Pluto |
Bill-
What are you polishing them with?
The Bartender's Friend (like Bon Ami or Comet, but about 1/2 way in between in abrasiveness) works great.
Wax the stainless after polishing for added protection.
Steel wool will destroy the molecular/alloy structure of stainless steel that enables it to be stainless (non-rustable). It's friction creates millions of miniscule welds that then break off, leaving "loose" iron atoms galore on the surface that then rust.
Are you moored in salt water? Is there a ground wire attached to the underside of the gas fill fitting?
On the other hand, you might just have a cheap form of stainless that isn't rust-proof ! (Hopefully less likely!)
Joe. 
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Sea Wolf, C-Brat #31
Lake Shasta, California
  
"Most of my money I spent on boats and women. The rest I squandered'. " -Annonymous |
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Doryman
Joined: 03 Oct 2006
Posts: 3807
City/Region: Anacortes
State or Province: WA
C-Dory Year: 2006
C-Dory Model: 255 Tomcat
Vessel Name: Lori Ann
Photos: Lori Ann
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| Posted: Mon Aug 13, 2007 4:58 pm Post subject: |
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Check out THIS THREAD
I went to Worst Marine to get some Flitz but when there they talked me into a more expensive German product designed for stainless passivation. I can't find the product in their online site, though. But what you need is a passivation product.
Warren
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Doryman
M/V Lori Ann
TomCat 255, Hull #55, 150 Yamahas
Anacortes, WA
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thataway
Joined: 02 Nov 2003
Posts: 20813
City/Region: Pensacola
State or Province: FL
C-Dory Year: 2007
C-Dory Model: 25 Cruiser
Vessel Name: thataway
Photos: Thataway
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| Posted: Mon Aug 13, 2007 6:14 pm Post subject: |
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I hate to say it, but: Cheap Chinese fittings and SS. OK, its not so cheap. This is what they got. I am living with it--and cleaning. There is really no excuse for this. I have had boats crossing oceans, with zero rust on the SS after 15 to 20 days at sea and coated with salt...So it depends on the quality of the SS and the way that it is treaded in the -manufacturing process.
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Bob Austin
Thataway
Thataway (Ex Seaweed) 2007 25 C Dory May 2018 to Oct. 2021
Thisaway 2006 22' CDory November 2011 to May 2018
Caracal 18 140 Suzuki 2007 to present
Thataway TomCat 255 150 Suzukis June 2006 thru August 2011
C Pelican; 1992, 22 Cruiser, 2002 thru 2006
Frequent Sea; 2003 C D 25, 2007 thru 2009
KA6PKB
Home port: Pensacola FL |
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Bill3558
Joined: 12 Jan 2007
Posts: 121
City/Region: RIchmond Hill, Georgia
State or Province: GA
C-Dory Year: 2006
C-Dory Model: 22 Cruiser
Vessel Name: Pluto
Photos: Pluto
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| Posted: Tue Aug 14, 2007 2:39 pm Post subject: |
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Thank you all for your thoughts. The thing thats weirding me out is why the gas caps would rust but the water tank cap doesnt. They are both exposed to the same external environment.
Yes the boat is moored in (mostly) salt water on the Ogeechee river.
Joe, when you say do I have a "ground wire" attached to the cap. Do you mean the beaded safety wire? Thats all that is attached. Should I have more than that?
Thanks again. |
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Bill3558
Joined: 12 Jan 2007
Posts: 121
City/Region: RIchmond Hill, Georgia
State or Province: GA
C-Dory Year: 2006
C-Dory Model: 22 Cruiser
Vessel Name: Pluto
Photos: Pluto
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| Posted: Tue Aug 14, 2007 2:44 pm Post subject: |
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| I will post pictures in my album so you can see what I'm talking about. |
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Doryman
Joined: 03 Oct 2006
Posts: 3807
City/Region: Anacortes
State or Province: WA
C-Dory Year: 2006
C-Dory Model: 255 Tomcat
Vessel Name: Lori Ann
Photos: Lori Ann
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| Posted: Tue Aug 14, 2007 2:44 pm Post subject: |
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My gas caps don't rust, but my water and head pumpout do.
Dunno what that means.
Warren |
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Captains Cat
Joined: 03 Nov 2003
Posts: 7313
City/Region: Cod Creek>Potomac River>Chesapeake Bay
State or Province: VA
C-Dory Year: 2005
C-Dory Model: 22 Cruiser
Vessel Name: Captain's Choice II
Photos: Captain's Cat
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| Posted: Tue Aug 14, 2007 6:03 pm Post subject: |
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| Bill3558 wrote: |
Joe, when you say do I have a "ground wire" attached to the cap. Do you mean the beaded safety wire? Thats all that is attached. Should I have more than that?
Thanks again. |
Bill, I think Joe was referring to the ground wire attached under the deck that is there to prevent a static discharge when you touch the gas nozzle to the deck fitting. It can't be seen unless you look underneath. It's not the beaded safety chain that prevents you from losing the cap, although with rust appearing, that might not be so bad. My 1994 fittings are still pristine and I have never done anything but wash them.
Charlie
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CHARLIE and PENNY CBRAT #100
Captain's Cat II 2005 22 Cruiser
Thataway (2006 TC255 - Sold Aug 2013)
Captain's Cat (2006 TC255 - Sold January 2012)
Captain's Kitten (1995 CD 16 Angler- Sold June 2010)
Captain's Choice (1994 CD 22 Cruiser- Sold Jun 2007)
Potomac River/Chesapeake Bay
K4KBA |
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Sea Wolf
Joined: 01 Nov 2003
Posts: 8650
City/Region: Redding
State or Province: CA
C-Dory Year: 1987
C-Dory Model: 22 Cruiser
Vessel Name: Sea Wolf
Photos: Sea Wolf
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| Posted: Fri Aug 17, 2007 1:33 am Post subject: |
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| Bill3558 wrote: | Thank you all for your thoughts. The thing thats weirding me out is why the gas caps would rust but the water tank cap doesnt. They are both exposed to the same external environment.
Yes the boat is moored in (mostly) salt water on the Ogeechee river.
Joe, when you say do I have a "ground wire" attached to the cap. Do you mean the beaded safety wire? Thats all that is attached. Should I have more than that?
Thanks again. |
What I was thinking about the grounding wire was that the gas cap is grounded whereas the waterfill is not, and that could be the difference in why one rusts and the other doesn't.
Joe. |
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