Why is it everytime i go to fill up the tank , i need a pee!!! 
It never happens when i fill the car up ,at the petrol station…perhaps its a HGV phenomenon!!! 
I always end up doing the Lord of the Dance (jig) 
followed by a power walk to the lavvy!
Your not on your own mate that happens to me too put it down to gettin older 
I experienced this phenomenon a lot but it seems to happen when I enter a site… had to wait the other day then a big fellow walked out and said in a broad Welsh accent " I’d give it 5 if I was you" I can safely say he wasn’t joking…
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maestegboy:
Why is it everytime i go to fill up the tank , i need a pee!!!It never happens when i fill the car up ,at the petrol station…perhaps its a HGV phenomenon!!!
I always end up doing the Lord of the Dance (jig)
Could be the sound of flowing liquid that does it. Often if someone (e.g. a child) needs the loo but cannot go when they sit down, someone can turn a tap on in front of them and that does the trick.
Or it could be that you needed the loo but the warmth of your backside on the seat made you feel it less sharply. Once you’re standing up you lose that warmth.
Or it could be that you associate filling stations with toilets, because they usually have them, especially stations that accommodate trucks. So it’s a sort of Pavlovian response.
IndigoJo:
maestegboy:
Why is it everytime i go to fill up the tank , i need a pee!!!It never happens when i fill the car up ,at the petrol station…perhaps its a HGV phenomenon!!!
I always end up doing the Lord of the Dance (jig)
Could be the sound of flowing liquid that does it. Often if someone (e.g. a child) needs the loo but cannot go when they sit down, someone can turn a tap on in front of them and that does the trick.
Or it could be that you needed the loo but the warmth of your backside on the seat made you feel it less sharply. Once you’re standing up you lose that warmth.
Or it could be that you associate filling stations with toilets, because they usually have them, especially stations that accommodate trucks. So it’s a sort of Pavlovian response.
I think most lory drivers stand up to pee. 
It’s known as the Columbo effect. You think you’ve finished the job & then your bladder says “Oh, just one more thing, Sir…”
Don’t need to wee at tank fills but I do get partially aroused.
The moment I get into bed I do a bladder check push thingy (or sphincter tickle for the medics) and there’s always a little left in me own tank. Can usually leave till morning though.
Talking of sphincter tickles…Ehh I’ll save it for another time.