Thats what I thought, a lot less hazardous.
The device I suggested is designed specifically for your application but obv my like is for the UK.
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Ok that’s great. Cyprus does many things like in the UK, so it should be ok. For instance we have the same electrical plugs.
The only slight glitch I can see is its just over the magic £135 (Post brexit) tax level. Personally if you choose to go that way I’d contact them and ask them for special discount to purchase it for £135. If they won’t play ball suggest buying it for £135 and paying a supplemental tip to cover the additional cost. (Hopefully my advice on tech is better than tax avoidance lol)
I loled on the tax avoidance 
Yeah i am afraid the price is a bit too high, especially when you consider i can just take a look through the window and check.
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So, really you just need a “smart button”. When you see that it is low, just press the button, then you will get an alert. 
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Genius! 
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Hahahah yes that looks like a great idea 
@JDRoberts is absolutely on the top of this subject. Any fuel tank has special regulations.
Just as a cautionary tale, a few years ago in Hungary a professional company has done a tank entry in one of the tanks of the Hungarian Oil Company (MOL). It was for inspection or cleaning, I cannot remember. (MOL has outsourced years ago all these services to subcontractors.)
It wasn’t the first entry for the person who did the job. Followed all regulations regarding confined space entry, etc. But unfortunately he dropped his lamp inside the tank. The lamp wasn’t an approved device for this kind of environment and use, it wasn’t spark free. When the lamp hit the surface a spark started and the fumes inside the tank ignited immediately causing the person to die inside the tank and another one be injured outside. (As I can remember. I cannot find any decent article about it.)
Wow this is some scary stuff…
Maybe i should stick to what i have…
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Just to clarify, that was a huge tank, like 5000 cubicmeters, but your smaller 3-5 cubicmeters tank carries no less danger. Fumes are the same dangerous, even if it is diesel or heating oil.
Otherwise to measure tank levels, they use a method called sounding. Or use flow meters to measure how much fuel was used.
Cars have floats in the tank, but those are fitted with the tank.
The cost involved to retrofit something to measure level would cost you far more than what you would like to for that simple feature.
This might be an option. Alternatively an external photo sensor around the site glass.
Best to find out exactly what the fluid is though.
This actually looks promissing. How will i bring this to smartthings though?
I believe it is heating diesel. Here is a photo of my provider’s sticker:
Maybe a relay and a dry contact sensor.
The video shows an Arduino and I know there have been some projects here using those. ST_Anything was one but I don’t know if it is still going.
I will give it a try. I think st anything supports esp8266 as well.
OK, One more go at this…
Nitrophyl NBR foam with a magnet in the middle, inside sight tube. External proximity sensor.
Has anyone done anything with CANBUS output from cars triggering smartthings things perhaps?
No magnets or metal inside the liquid unless specifically made for this purpose. Even inside the float that is made for this purpose.
And you would have to get the contact sensor too close to the tube as well.
Seriously: do not try to cobble together a DIY solution from unapproved parts. 
Buy a readymade system approved for diesel/flammable products or use an external scale/pressure plate with the power at a safe distance.
Don’t put anything inside the tank/tube not specifically designed for that purpose.
A friend of mine who works on boats says even a float can be a problem if the tank is designed for a specific volume of vapor when it is full. The reviews for the float you previously linked to were from people who were replacing an existing float.
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I’ll just say I believe this to be the safest of any of the DIY ideas (other than your pressure plate, and maybe the manual smart button), but considering the nature of the application, I’ll just leave it alone.
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Although this is not technically leaving it alone, but temperature variance of the target zone seems promising, either with external probes on the walls of the tank, or with thoroughly over-engineered at-a-distance laser thermometers. 
Guys i have to say you have scared me off. I will put this aside for now… Thank you for your help everybody!
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