I have large lawn mowers and other outdoor 12volt gasoline equipment. I allways install aftermarket fuel pumps. No mater how long the mower sits without useing,if you turn the pump on for a minute it fills the carb bowl and starts instantly .They are trouble free. I took an old one apart to see how it works. It has a coil and an oscillating piston. I didnt see any points to make the piston go back and forth. Does anyone know how they work? Thanks in advance . Edwin Dirnbeck
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OFF TOPIC How do the low pressure gasoline fuel pumps work
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The older pump designs often used points in order to oscillate the piston. The points were often housed in a sealed chamber filled with an inert gas like argon in order to prolong point life.
Newer pumps styles like the Facet pump below now use a solid state electronics circuit to replace the points.
Home, down in the valley behind the Red Angus
Bad Decisions Make Good Stories​
Location: British Columbia
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Doozer, remember though that these types of pumps work much better at pushing fuel than lifting it if the need should occur to suck some gasoline out of a car's fuel fill pipe.
You may still need to lift by other means as they create no vacuum so they will absolutely not work for that type of service. They work best when gravity fed.
Keep these breath mints handy.
Home, down in the valley behind the Red Angus
Bad Decisions Make Good Stories​
Location: British Columbia
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Originally posted by Willy View PostDoozer, remember though that these types of pumps work much better at pushing fuel than lifting it if the need should occur to suck some gasoline out of a car's fuel fill pipe.
You may still need to lift by other means as they create no vacuum so they will absolutely not work for that type of service. They work best when gravity fed.
Keep these breath mints handy.
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Originally posted by Willy View PostThe older pump designs often used points in order to oscillate the piston. The points were often housed in a sealed chamber filled with an inert gas like argon in order to prolong point life.
Newer pumps styles like the Facet pump below now use a solid state electronics circuit to replace the points.
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Originally posted by old mart View PostNow, I understand, the simple electronics produce an AC low frequency in the coil and the piston oscillates sympathetically. The pressure would be very low, which is just what is required.Home, down in the valley behind the Red Angus
Bad Decisions Make Good Stories​
Location: British Columbia
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Low frequency AC or pulsating DC? Not much difference, really.
Originally posted by Willy View Post
To be honest the last time I had one apart I did not investigate the circuit to see if it was a low freq. AC or pulsating DC that was used to drive the coil in order to oscillate the pump's piston. I assumed it was pulsating DC but not being EE I could be wrong.Paul A.
SE Texas
And if you look REAL close at an analog signal,
You will find that it has discrete steps.
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Originally posted by old mart View PostNow, I understand, the simple electronics produce an AC low frequency in the coil and the piston oscillates sympathetically. The pressure would be very low, which is just what is required.25 miles north of Buffalo NY, USA
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Originally posted by Paul Alciatore View PostLow frequency AC or pulsating DC? Not much difference, really.
Thoughts.
Being a lo-tech automotive application IC or circuit cost would likely be the deciding factor I suppose.Home, down in the valley behind the Red Angus
Bad Decisions Make Good Stories​
Location: British Columbia
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Originally posted by Doozer View PostA magnet will have an attraction for iron, regardless of the DC polarity or if it is powered by AC.
Elementary school science here folks.
-D
But which one has the greatest overall electrical and cost efficiency?Home, down in the valley behind the Red Angus
Bad Decisions Make Good Stories​
Location: British Columbia
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