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Old 16 April 2016, 05:37   #11
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I'm happy to replace with stainless again although I'm surprised by the corrosion.
You were very very naughty to fill that tank with water!

I'm not a metallurgist, but stainless steel requires oxygen to maintain a rust free barrier on it's surface. If the oxygen in that water became depleted it may have effectively created an environment that allowed crevice corrosion to occur. Poly will have a learned opinion on this theory

Personally, if the actual corrosion was superficial, I'd clean it up and polish it and refit the lot with decent sealant. There was a thread a couple of years back when Osprey fuel hatches were failing - a product was recommended? With FUEL in the FUEL tank, a repeat is unlikely
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Old 18 April 2016, 11:21   #12
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I remember a couple of fuel filters gumming up a couple of years back due to ethanol...
Willk; Not to hijack the thread, but what was the source of the gumming? I've heard of problems with 60's and 70's era vinylester fuel tanks and ethanol, but not much more than that.

jky
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Old 18 April 2016, 11:59   #13
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Willk; Not to hijack the thread, but what was the source of the gumming? I've heard of problems with 60's and 70's era vinylester fuel tanks and ethanol, but not much more than that.

jky
It occurred on a RIB in the Round Ireland 2013. There was a spin-on fuel filter fitted and it began to clog up unexpectedly after it's first fuel up in the Republic of Ireland. We have a higher percentage of ethanol than the UK. Apparently we need an ethanol friendly filter? The tank in question was stainless. Possibly there was a release of old gum once the ethanol came into play?
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Old 18 April 2016, 16:53   #14
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I was discussing with my dad if the ethanol levels had elevated as much as was predicted.

Metal brite cleaned the rust and stainless off and new gaskets and stainless nuts and bolts purchased. Gonna keep as was. Thanks for help.
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