Adding a gas tank return

[elcamino73]

I just added EFI to an old carb type tank.
I brazed a return line that is three inches long in the sender plate.
It sure would be nice to know what a stock EFI setup normally has!
It already has baffles in the tank.


----- Original Message -----
From: "Fran and Bud" <quest100 at gte.net>
To: <diy_efi at diy-efi.org>
Sent: Thursday, December 27, 2001 4:14 PM
Subject: Re: Adding a gas tank return


> IMHO
> I believe that it is NECESSARY that the return line returns the fuel to
VERY
> near the bottom of the tank, well BELOW the fuel level to prevent fuel
> aeration.
>
> Another reason to return to the bottom is that fuel flowing thru a line
and
> discharging thru open air space CAN (not WILL - just can) ignite the vapor
> space under certain atmospheric conditions.  Fortunately most of the time
> the vapor will be too rich to ignite and besides the weather wont be prone
> to static generation - BUT you only have to be the "one in a million" that
> it happens to for your whole day to be ruined.
>
> More important to using a tank that was not originally intended for EFI is
> an well or a baffle for the fuel pickup to assure that the pump does not
> suck air when the fuel level is low or when slosh from cornering, hard
> acceleration, or braking can uncover the inlet.
>
> I have had good luck for years in adding things like outlets or returns by
> cutting a 2 1/2" or 3" disc from some heavy sheet metal with a hole saw
and
> then brazing tubing or fittings into it and drilling a 4 to 6 hole pattern
> near the outside edge.  It can then be fastened over a small hole in the
> tank using cork or neoprene gasket material and bolted down with 4-6 self
> tapping sheet metal screws.  If you want to get fancy you can use threaded
> inserts and machine screws.  In any case all of the fabrication is
external
> to the tank except for cutting the extra hole in it, and vacuuming out the
> shavings.
>
>
> Bud
>
> ----------
> >From: ECMnut at aol.com
> >To: diy_efi at diy-efi.org
> >Subject: Re: Adding a gas tank return
> >Date: Wed, Dec 26, 2001, 2:10 PM
> >
>
> >Hey Bruce,
> >why does the return line have to be above the fuel level?
> >Thanks,
> >Mike V
> >In a message dated 12/26/2001 4:49:11 PM Eastern Standard Time,
> >nacelp at bright.net writes:
> >
> >>
> >>  The oem sender has a restrictor on the CCP line, and the oem return is
> >below
> >>  the fuel level.
> >>
> >>  Has anyone dealt with a similiar situation?, and what was your
answers.
> >>
> >>  Drilling into the filler neck looks like a real PITA.
> >>
> >>  Beginning to look like a tank R+R and adding bulk head AN stuff around
the
> >>  sender is the only answer.
> >>  TIA
> >>  Bruce
> >
> >----- End of forwarded message from owner-diy_efi at diy-efi.org -----
>
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