Pumping petrol - is pumping slower better?

Soldato
Joined
11 Nov 2002
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Location
West Mids
Not sure if this should be in Motors or not since it's pretty random.

While filling up today, I was wondering whether the pressure you put on the trigger affects the amount of petrol that comes out. Obviously the more pressure that is put on the trigger, the faster the petrol comes out, but I've often noticed that if I slam the trigger all the way in straight away, the £ counter starts before I can hear any flowing liquid exit the nossle into the tank.

Does this delay happen when you squeeze the trigger lightly and pump the fuel more slowly?

I gues the main question here is this:

Is it more cost effective to pump your fuel slowly rather than quickly?
 
i remember on the news an AA guy said if you pump slower u get more because of fumes or something, cant remember proper it was a while ago.
 
For the small difference, i would rather be in, out, and back on the road instead of standing for ten minutes while my fingers go numb!
 
apparently it's best to fill up on a cold morning when petrol / diesel is denser, therefore you can fit more in your tank, it was also mentioned that pumping slower reduces air in the tank too so that you can fit more in the tank, however, you wouldn't get more petrol for say £20 wether you pump slow or fast.
 
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