Fuel pump questions

Frederic Breitwieser frederic.breitwieser at mcione.com
Tue Dec 9 16:50:06 GMT 1997


>Then, someone says the fuel shouldn't drop into the tank .... have
>I done something potentially dangerous ?    been running like this
>for almost two years !!   could it be that it creates more in-tank
>vapors ??  (doesn't sound right to me ??) .... or that it allows the

The trickling down the filler neck can in some cases cause the fuel to be a
little aerated, however I don't think it would be anywhere near enough to
be noticable, consider the flow back (trickle) versus the flow to the fuel
rail (much more).

It would be fun to try and figure out some math, but as you said, works for
2 years without a hitch, that's scientific enough for me.  Most in-tank
fuel pump systems have a return line, that drops off the top of the tank
fitting about 1", so if your tank has less than 1" of fuel, its falling
through air to reach the fuel level, wherever that is.  So, I don't think
running down the neck is a real problem at all.


Frederic Breitwieser
Homebrew Automotive Mailing List
Bridgeport, CT 06606
http://www.geocities.com/MotorCity/Downs/4605/index.html
(Portable Webserver Link Address)

1989 AG Hummer 4-Door
1993 Supercharged Lincoln Continental
2000 Mid-Engine Sports Car <smile>

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