2h Fuel filler neck question? (1 Viewer)

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Joined
Mar 10, 2019
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Location
melbourne, Oz
I just recently noticed some corrosion on my 1988 hj75 2h troopy fuel filler neck. I was surprised as I usually try to keep my fuel tank full all the time to avoid much air being in the tank, in which air holds water.
I wouldn't have noticed normally at a bowser , but I was filling from a jerry can , remote, on a hill, so I was a good foot shorter than usual so I could easily peer in. A little bit condensation rust.
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We have had at least good year of lots of rain, I don't have a garage to fit the troopy, so lives outside with the other animals unfortunately.

First I went to look on amayama if I could get a new one, yep ripper mr.toyota, part no.

Toyota (7720160200)​

The end bit is a bit different for mine but I am sure it could work.

Then I went to my 1985 wreck and grabbed that filler to have a look. It's internals are a bit better than my 88.
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What is this canister for?
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I hope one day to tentatively run biodiesel, and I am slowly changing fuel lines and seals to viton. Zinc and copper is not too agreeable with veg oil, a stainless filler neck (and fuel tank) would be ideal which would take some hunting in boating shops.
So could make a similar setup to the ome in stainless with a joining nylon filler tube.

But what is the role of this canister?
 
expansion tank for pressure changes

the white plastic thing is a one way check valve
 

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