Conversion to EFI : Fuel system

Fri Mar 19 19:00:13 GMT 1999

> was all sorts of gas on the ground!  It came through the vent!  And a
> lot of it!  I'd bet at least 1/2 gallon would spew out.

The last carb to efi conversion I did I attached the vent hose to the filler
neck at a 90 degree angle, so that it would overflow/spray into the neck
when filling.  Off that, heading upwards, was a short piece of hose at a 90
degree angle to that, so the gas really had to turn around to go out.  A few
little dribbles, no big deal.

I discovered the vent hose for my Dodge D200 (carb currently) hangs off the
top of the tank, then dangled on the inside of the frame towards the
ground.  If the gas pump had enough pressure, it would eventually come out
the vent hose and keep going due to the end of the hose being lower than the
tank itself.  What a dumb thing that was.  Not sure if Dodge did this or the
imbicile who had the truck before me.  Anyway, that too went to the filler
neck.

>
>
> Moving your fuel lines to the outside of the frame would help cooling
> while driving greatly.  Also insulating the fuel rails or fuel line by
> then engine will help.
>
> Andy
>
> ---Ward Spoonemore <spoonie at deltanet.com> wrote:
> >
> > 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
> > > >
> > > >
> > >
> >
> >
>
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--

Frederic Breitwieser
Bridgeport CT 06606

1993 Supercharged Lincoln Continental
1989 HWMMV w/turbocharged 500cid Caddy
1975 Dodge D200 Club Cab soon to have 431 stroker + turbos
2000 (I hope) Buick GTP (Mid-Engined Sports Car)