Adding a gas tank return

[Jeff Meager]

And note.  Depending on how much your pump flows, you will need to ensure
that the return goes back into the in-tank swirl pot, not outside it.....or
the pump will empty the swirl pot - esp if the pump can flow more than the
holes in the swirl pot - had this before....

LJ

-----Original Message-----
From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
Behalf Of Fran and Bud
Sent: Friday, 28 December 2001 5:15 AM
To: diy_efi at diy-efi.org
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
>
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