Oil Storage Tank Query

[swillbridge]

I have a 1200L plastic oil storage tank for domestic heating. Today we had an oil delivery in which the driver managed to make a minor spillage with oil over the tank and over the fence next to it, he says there is a hole in the top which should have a bung in it but says it wasn't there before he started which makes me wonder why he would start if he thought this might be and issue, but my main questions are 1. would there have been a bung in this hole?, and 2. what what would this hole be used for?

 

[leakydave]

It looks like a connection for a Watchman Sonic Remote Oil Gauge.

 

[Burnerman]

Its where an oil level transmitter unit is fixed to the tank.
John

 

[simond]

Did he also point out it was too close to a combustible boundary?

 

[swillbridge]

If it's where a sender unit would go and there hasn't been a unit there since we have been at the house then would there have been a bung or cap on it? as surely water would have got into the oil tank we have have never had a problem with the boiler.

 

[simond]

Are you suggesting your delivery driver has a role in the hole?

 

[Burnerman]

It looks like the previous owner has removed the transmitter, maybe to sell it on.
Anyway, block the hole with some silicone or whatever, just to keep the rain out.
John

 

[swillbridge]

I have it covered temporarily for now but will sort it permanently tomorrow. I am not saying the delivery driver had any role certainly not purposely, its just we have been at the house a few years or so and there has never been a sender unit on it and we have never had any spillages until now and as far as i am aware no water in the oil tank certainly none to affect the boiler as i would have thought it would make the boiler cut out wouldn't it?