I think the question from the OP is, how can you be sure you are getting 10 litres of petrol and not 9.5 litres of petrol and 0.5 litres of air.When fuelling I sometimes take a note of the price per litre, say €1.50 a litre, I then pump 10 litres exactly in and check that it matches in money terms, in my easy math example that pump would show 10 litres purchased at a cost of €15, it's easy to do it with odd amounts, use a calculator but do check occasionally to ensure you are getting what you are being charged for.
I think the question from the OP is, how can you be sure you are getting 10 litres of petrol and not 9.5 litres of petrol and 0.5 litres of air.
The pump is calibrated to operate as fuel is moving through, will it record just air passing through ?, I would not have though so as the fuel comes directly from the underground tank there should be no air or all air if that tank were empty, the nozzle is just a nozzle, you pay for what is pumped into that nozzle so ensure you get every drop yu can.
Check as I suggested to verify.
If this was the case your 'check' would still be true, ie. simple calculation, multiply PPL X litres measured delivered.When I pressed the handle on the nozzle to release the petrol I would swear that nothing was coming out except air. After about 70c was clocked up on the price display system I felt the flow of petrol.
@Palerider , your 'check' has nothing to do with the OP's question. Your advice is simply to see if price per litre matches the total price of fuel measured as dispensed. Whereas the OP has stated:-
If this was the case your 'check' would still be true, ie. simple calculation, multiply PPL X litres measured delivered.
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It is not that I check regularly and any time I have I found no difference but fuel stations have been fined for differences, one comes to mind on the Quays in Dublin.
Let me elaborate as you admonish my attempt at responding to the op, if the pump is taking fuel from an underground tank then no air should be in the pipe work, the pump is calibrated based on liquid running though it, I asked whether air would make the pump record as fuel and cost it accordingly but don't have an answer for that, I would guess not, if it did then you are paying for air in the fuel which is not likely or an airlock.
As an aside if you'll humour me it is no harm for a paying customer to occasionally check the pump calibration.
As an aside if you'll humour me it is no harm for a paying customer to occasionally check the pump calibration.
Some people say that the best time to fill up with petrol is early in the morning or late at night when the petrol fills less volume i.e. you get more petrol in your tank than what the pump measures. (Irish pumps are calibrated at 12C (or 15C?)
Some will argue that there should be no difference as most tanks are underground, and therefore keep the petrol at a relatively constant temp.
Jim Stafford
<snip>......if they don't, then (as usual) I'm talking out a different orifice.
I think you'll find that the above quote will be proven. All you'll get, if any, will be what's left between the trigger and the nozzle tip.
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