Fuel pump questions

[James Boughton]

Fuel splash tends to generate large amounts of vapor that must
go through the purge canister to eventually exit to the engine.  In 
theory this should all be accounted for by the EFI system.  In practice,
you can find driveability problems associated with large amounts of
purge vapors.

Jim Boughton
jpb01 at ibm.net

----------
> From: Bruce Bowling <bowling at cebaf.gov>
> To: diy_efi at efi332.eng.ohio-state.edu
> Subject: Re: Re[2]: Fuel pump questions
> Date: Monday, December 08, 1997 5:07 PM
> 
> > 
> > The return line must have a min of pressure.
> > All gas tanks have a line at the bottom of the tank, for the pick-up,
> > and then various others, they can be mounted all over the place.  
> > I beleive it was some Chry. where they had some mounted on the sides at
> > about what would be 7/8 full.  On some tanks there is a large trapped
> > air bubble, all I was making the point was not to let the return line be
> > covered, if the return is sometimes covered the return line pressure
> > goes up, the regulator can't bleed the pressure down, and the motor goes
> > very rich.
> >   Hope that better explains it   Bruce  nacelp at bright.net
> > 
> 
> I have heard that the return line must exit at the bottom of the
> tank, so there is no "fuel splash". I think I got this from the
> JTR book. Is this true? Does it matter?
> 
> - Bruce
> 
> --
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>                  Bruce A. Bowling
>                  Staff Scientist
>    Thomas Jefferson National Accelerator Facility
>     12000 Jefferson Ave - Newport News, VA 23606
>                  (804) 249-7240
> bowling at cebaf.gov  http://devserve.cebaf.gov/~bowling
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