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Old 01-30-2014, 08:10 PM   #1
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How do fuel pumps not explode?

Its an electric motor that sits in fuel.The theory Ive heard is that its submerged in fuel so it cant but what about if you let the vehicle run out of fuel.Its all fumes at that point,which are what will blow up.

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Old 01-30-2014, 08:26 PM   #2
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The fuel-air mixture has to be within the upper and lower limits for the vapors to explode.

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Old 01-30-2014, 10:09 PM   #3
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There is not enough oxygen in the fuel tank to support combustion. You need oxygen fuel and heat in the proper amount before ignition can happen remove any one of the three and no combustion.
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Old 01-31-2014, 06:53 AM   #4
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Good question I always wondered myself. But what I really want to know is why in the tank? Seems it will fail eventually and a lot of work to replace. Why not on the outside with a filter ? Seems crazy.
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Old 01-31-2014, 12:02 PM   #5
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The motor is a sealed unit, no vapors get into it.
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Old 01-31-2014, 12:05 PM   #6
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It's also 12v and most likely brushless, so no sparks. "Electrical" doesn't always mean "sets stuff on fire".
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Old 01-31-2014, 02:25 PM   #7
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Quote:
Originally Posted by chucky cheese View Post
Good question I always wondered myself. But what I really want to know is why in the tank? Seems it will fail eventually and a lot of work to replace. Why not on the outside with a filter ? Seems crazy.
as the pumps opperate, they heat up. sitting in a tank full of fuel, helps to keep them cool, which helps them run longer before failing. a fuel pump is really a fairly simple device, and will usually last a very long time before it goes out.
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Old 02-06-2014, 06:35 PM   #8
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black magic?
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Old 02-06-2014, 07:48 PM   #9
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Great responses.Thanks.

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