Atkinson Tankmaster - sticky pull to read valve

[Rollerball]

What is it that makes these valves start to stick after some time? Over the years I've replaced the one on my oil tank two or three times and the current one was only replaced about a year ago yet it's already starting to get pretty tough to pull out and push back in.

The main aluminium body (that the pull to read valve, sight gauge and fuel lines screws into) was last replaced about ten years ago or more in case that's relevant.

I have noticed in the past that old removed valves are ever so slightly rusty, but why would they rust when coated with kerosene?

I should note that last year's newly installed valve has been working just fine until recently.

 

[ianmcd]

Please dont use multi posts about the same thing, it is against site rules for good reason

 

[Rollerball]

Eh? Please explain. I think you're confused. My other Atkinson Tankmaster post was regarding a totally different matter, namely the sight gauge. Here it is:

Atkinson Tankmaster Sight Gauge/Tube - is this easy to replace?

Over the years the sight gauge/tube on my oil tank has become increasingly discoloured (presumably on the inside as I've cleaned the outside) which makes it a bit tricky to see the green bead. I happen to have a spare sight gauge but I'm wondering if this is easy to replace. Is it just a case...

www.diynot.com

Edit: or are you referring to the following post from 2016:

Oil tank with sight gauge - sticking plunger

My oil tank has this kind of Atkinson Tankmaster sight gauge: http://i.ebayimg.com/00/s/MTYwMFg3Mzg=/z/c14AAOSw14xWPzt4/$_57.JPG The small plunger at the side that you pull out/push in to get an oil reading on the sight tube often gets stuck, either it's tough to pull out or tough to push in...

www.diynot.com

in which case the new post in this thread is asking other questions not asked in the original thread.