[Diy_efi] GM Fuel Pump / Tank Options

[Clair Davis]

Jason,
I've done a LOT of searching without much luck, either.  I believe you're
right that there are tanks out there with large openings as well, I remember
looking at some for the little baffle structures inside long before I found
this tank.  Now to try to find what those tanks were...

The tank material is at least 1/8" thick, probably closer to 1/4" or so.  It
appears to be two layers, a black outer layer, and a light gray or white
inner layer.  Not sure what that means in respect to its ability to be
plastic welded.  I like the idea of adding a brass fitting... is that also a
McMaster item?  To be honest, I can't think of a brass fitting I've seen
that was at least 1" ID - the size of the GM fill pipe hose stub that's
still on the tank.  Finding the spot on the tank that will let that happen
is another thing.  I'll need to hang the tank in place and see where it
falls under the existing fuel filler tube hole in the trunk floor.

I took a couple photos of the tanks in question, and I'll try to upload them
to my web site shortly.  That way I can add a link to see what the situation
is.

Thanks for the reply and alternatives!

Clair


----- Original Message ----- 
From: "J M" <galaxiecustom500 at yahoo.com>
To: <diy_efi at diy-efi.org>
Sent: Sunday, August 26, 2007 4:45 PM
Subject: Re: [Diy_efi] GM Fuel Pump / Tank Options


> Replies after original text:
>
> > Anyone have a resource for various DIA's and bends
> > of fuel filler hose?
>
> I did a little internet searching, didn't find much
> that would help. As far as someone selling pre formed
> hoses.  You can buy polyethylene tubes from McMaster
> (what the gas tank is made from) It's a thermo plastic
> so you should be able to heat it to bend it but it
> might be hard to keep it from closing off on a tight
> bend.
>
> Alternativly with a plastic welding kit you should be
> able to add a fuel fill bung on the other side of the
> tank.  Actually the tank material is likely more then
> thick enough that a brass fitting would be able to
> thread in.  Then get a short piece of viton hose to
> connect that fitting to your stock filler neck.
>
>
> >
> > Issue 2) The Plymouth tank is essentially the
> > perfect depth to adapt the
> > Z-28 pump, but only if I can find the correct lock
> > ring base to weld in.
> > The lock ring has an ID of 3.5", and the pump gasket
> > has an ID of 4.125" and
> > an OD of 4.5"  If I can find a steel GM tank that
> > uses this size of pump
> > bulkhead, I can cut that part out and weld it in to
> > my Plymouth tank
> > relatively easily.  Naturally, you'd think that a
> > steel tank from a Z-28
> > would do the trick, but the steel tanks appear to
> > have the swirl pot built
> > in to the floor of the tank, not the pump like the
> > 99+ LS-1 Camaros did.
> >
> > Anyone out there know of a similarly-sized pump
> > bulkhead that might do what
> > I need?
>
> I've never measured, but that sounds similar to the
> tank opening from a 80's caprice.  Probably about
> everything GM in the 80's as well.
>
> Also you could probably just make one.  The lock ring
> method might be hard to fabricate on your own, but a
> studed fitting would be easier.  The later
> caprices/impalas had one.  Had studes in the tank, the
> sending unit was sandwhiched between the tank and a
> metal ring.
>
> Another alternative, if you have a realatively flat
> area on that plymouth tank where you could cut out the
> sending unit bulkhead from the camaro tank, get some
> viton or polyethylene sheet to make a gasket and then
> bolt the plastic part down to the plymouth tank.
> Maybe weld a flat panel to the top of the tank?  As
> for the viton gasket, you could also use the black
> rubber/fiber material most parts stores have as long
> as it's not in constant contact with gasoline.
>
> Not that familiar with the car you are working on but
> to me the best option sounds like using the camaro
> tank, loosing a bit of spare tire well, and making a
> new fuel filler bung on the tank for the stock filler
> neck.
>
> good luck,
>
> Jason.
>
>
>
>
>
>
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