Conversion to EFI : Fuel system

[Ward Spoonemore]

You guys do know there are a lot of cars out there that do not have fuel
return lines, Chrysler, and Ford for example use pressure regulators that
are in the tank.

You may be overlooking the fact that the fuel in the tank will reach
something near underhood temperatures aft a relatively short time. Probably
about 150 Deg F. Common. (but wrong) thinking is that cold fuel will be
coming from the tank, Maybe in the Arctic. Obviously if you circulate a lot
of fuel through a hot environment the heat will transfer.

New car makers have a major probable with Carbon Can systems loading with
hot vapor from the tank. The ECM/PCM will enable can purge when it thinks it
can get away with a period of rich fuel, If you look at the Short term fuel
correction value you can see the engine going very rich until the purge is
done or disabled. using a late Camaro as an example the pressure in the fuel
tank will get high enough to blow the fuel cap out of your hand when
removing the fuel tank cap !

So anything you can do to reduce fuel heating will make the emission problem
more manageable,

Ward



> -----Original Message-----
> From: owner-diy_efi at efi332.eng.ohio-state.edu
> [mailto:owner-diy_efi at efi332.eng.ohio-state.edu]On Behalf Of
> Guenther,Max
> Sent: Friday, March 19, 1999 7:11 AM
> To: 'diy_efi at efi332.eng.ohio-state.edu'
> Subject: RE: Conversion to EFI : Fuel system
>
>
> What are you planning on using for the reserve tank? Thats my next and
> hopefully final hurdle.  Some guys here had suggested using part of a
> holley float bowl.
> Max
>
> >----------
> >From: 	Mitch[SMTP:ozyman at employees.org]
> >Reply To: 	diy_efi at efi332.eng.ohio-state.edu
> >Sent: 	Friday, March 19, 1999 9:16 AM
> >To: 	diy_efi at efi332.eng.ohio-state.edu; diy_efi at efi332.eng.ohio-state.edu
> >Subject: 	Re: Conversion to EFI : Fuel system
> >
> >At 09:39 PM 3/18/99 -0500, Shannen Durphey wrote:
> >>First off, I haven't read any of these books, but Bruce gives
> >>practical advice, good for following.
> >
> >Yes.  I like Bruce's advice.  In addition to Knell's way, I am
> also talking
> >to a local friend of mine who has done this slightly differently.  So I
> >want to understand all angles.
> >
> >>Why not find an EFI factory tank that will fit under the Elky?
> >
> >I might be able to do this for the Malibu (not the El Camino, it's not
> >getting the TBI), for considerable cost.  But if I'm going to
> put a V8 into
> >a 240Z I'm going to have to solve this eventually.  That's why I call the
> >Malibu an EFI mule; I intend to experiment on it.
> >
> >>'Sides, the stock 66 tank doesn't have the charcoal canister
> >>connections or return line, AFAIK.
> >
> >Doesn't have any of the necessary lines.  So you remove the
> sender assembly
> >and machine new holes.
> >
> >>  And if you have safety inspections
> >>where you live, seeing non stock fuel system might make inspectors
> >>nervous.
> >
> >Luckily, the State of California cares nothing about safety (unless you
> >want to light up a smoke in a bar).  All they care about are
> emissions and
> >the Malibu is exempt.
> >
> >Thanks for the replies.
> >
> >Mitch
> >
> >
>