return line to gas tank

[Walter Sherwin]

I think you may want to address two different aspects, when designing your
TBI recirculating fuel system.  You want to create a replenishing reservoir
(dam) around your in-tank fuel pump pickup point in order to prevent
starvation during braking and cornering.  However, you should always keep
the return line discharge as far away from the pump pickup point as
possible.  In fact,  you should make sure that the return line extends to
the floor area of the tank and discharges away from the pump pickup.  If you
don't,  then you will have a lot of trouble with foaming, hot fuel, and
vapor related issues.  When possible, it is always best to use an in-tank
fuel pump with strainer sock.   OEM's often try to isolate the hot return
fuel, from the rest of the bulk fuel, in order to improve evaporative
emissions.  However, I would think that you would be more interested in
cool, bubble free fuel.  Bye.................


-----Original Message-----
From: mrvette <mrvette at bellsouth.net>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Monday, October 19, 1998 1:47 PM
Subject: Re: return line to gas tank


>As a matter of fact   DO   aim it toward the fuel pick up, and if you can
easily
>put some sort of a 'trap' in the pick up point to hold the fuel as you
corner on
>a lo-empty tank,   these recirculating systems  'use' much more fuel than a
>straight carb feed setup,  so any slosh problems are greatly
>magnified....frankly it's a pain in the ass even for auto
companies.....GENE
>
>Stowe, Ted-SEA wrote:
>>
>> hi.
>>
>> I'm just about to go out and find a shop to do some light brazing or
>> welding, to add a fuel return line to my mgb gas tank. I bought a used
>> sender/fuel line unit, so I could take the fuel line off that and add it
to
>> the existing one in my car. before I do this, are there any rules about
fuel
>> return lines ? other than don't point it at where the float would be
sitting
>> ?
>> I am trying to minimize the surprises/features.
>>
>> thanks, Ted Stowe
>
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