On Fri, 05 Apr 2013 05:38:59 -0500, Ignoramus25601
I was replying to the last question and implying that your first two
But, Iggy Poo, if you must ask, there are certainly light bulbs,
screws, and sheetmetal panels and framework inside, too. Last, but
not least, several stickers for inspectors and/or calibration will be
hidden inside. Perhaps a plastic window or two hide there, too.
Silence is more musical than any song.
-- Christina Rossetti
Usually a pump with dual heads (2 pumps if it also has a diesel nozzle)
Metering unit which controls how much low grade to mix with the high grade for
the blends. Set of flow meters Display, selection, control boards, receipt
the credit card reader head.
There are no pumps in those units, modern gas stations use submersible
turbine pumps similar to well pumps. All that is in those dispenser
units is a set of metering units, possibly some filters and a PC with
card and prox readers. I'm afraid scrap wise the stainless steel cabinet
it's all in is probably the most valuable part.
Take a look at this thread for more info than you ever wanted on fuel
You may be hearing the flowmeter turning. On the older gas pumps I'm
familiar with the flowmeter was essentially a positive displacement
motor driving the tabulating mechanism. It appears that the pump on
the page cited has a similar arrangement except the "motor" (the
silver device in the second pic) drives an encoder instead of a
mechanical display as in an old pump.
I think they would have to be quite old to actually have pumps in them.
What you hear is more likely to be either the noises from the metering
units, or in some cases if the area is quiet you may hear the in-tank
pumps whirr transmitted through the fuel lines much the same way as you
can hear your well pump 200' down the well if you listen at the plumbing
in the house.
Polytechforum.com is a website by engineers for engineers. It is not affiliated with any of manufacturers or vendors discussed here.
All logos and trade names are the property of their respective owners.