piclist 2008\07\11\084611a >
Thread: Fuel economy measurement across the globe
www.piclist.com/techref/index.htm?key=fuel+economy+measurement
face picon face BY : email (remove spam text)(Olin Lathrop)



Sean Breheny wrote:
> Thanks for the reply, Olin, but I wasn't talking about how the pump
> knows to stop pumping. As I understood it, several piclisters were
> saying that the valve at the nozzle end normally stays closed to
> prevent people from emptying the tube after the pump has shut down. I
> was wondering how the valve at the nozzle end "knows" to close after
> pumping is finished.  I would have thought that it would open whenever
> the handle was squeezed closed.

I'm not sure what you're asking as it's not making much sense.

The valve for starting and stopping gas flow when filling your car is in the
nozzle.  This valve is usually activated by a grip that you squeeze.  When
your tank is full this valve shuts off by itself, or you manually release
the grip to shut it off.  If you were to squeeze the grip again, more gas
would flow, but you'd also get charged for that.

The pump senses when you return the nozzle to the holder in the pump and
completes the billing.  On some pumps this is done by swinging a lever which
phisically locks the nozzle in place.  It won't be released until the next
billing has started.  Some pumps shut down the internal pump, but of course
it is turned on again when the nozzle is removed by the next customer.

I'm not really sure what you're asking.  Haven't you ever filled up a car
before?  If not, go with someone next time they do it.  It's really not
complicated, and it's pretty obvious how the system works when you look at
it.


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