[Diy_efi] fuel tank fittings

[Clair Davis]

Well, I've got to admit that part of this project (the DIY part) is because
I'm trying to save some bucks.  The cost of another tank at the local
pick-a-part is about $50, if you can find one that they didn't sacrifice to
drain the gas first.  Visualize a 3" steel pipe tapered to a point,
protruding from a large metal funnel... the tanks are "drained" using a
giant forklift by piercing the tank with the steel pipe, and occasionally
the tank is scraped off the bottom of the car/truck using the forks on the
fork lift... it's not pretty.

Anyway, I would rather buy a plastic welding kit than use that money to buy
extra plastic tanks if possible.  Of course the plastic welding kit is about
the same money as a new steel tank that I could weld the appropriate lock
ring in to.  I already have a MIG in the garage.  Not that I would mind
justifying the purchase of a new tool, but I've got to be mindful of funds
at this point.

Also, I'm an OEM-kind of guy, so excuse my ignorance here, but what is
standard fuel filler flex pipe, and where can you get it?  The OEM Plymouth
filler tube is about 2" galv. steel, so I'm really only familiar with rigid
pipe and some form of rubber bits to attach the caps, etc.

Clair


----- Original Message ----- 
From: "Ernest Buckler" <ebuckler at icehouse.net>
To: <diy_efi at diy-efi.org>
Sent: Tuesday, August 28, 2007 9:30 PM
Subject: [Diy_efi] fuel tank fittings


> Gents, Bill, Clair,
> May I suggest that grabbing a plastic tank or two or three from a salvage
> yard should give you plenty of material to cut and glue and drill and tap
> and experiment with?  Perhaps these techniques ARE known somewhere on the
> planet, but maybe for here and now the best thing would be to break new
> ground and figure out what works and what doesn't?  Talk to some hi-tech
> adhesive people, tell them what you're doing, go with their recco?   Just
a
> thought.   BTW, why NOT use a standard fuel-filler flex pipe?  No reason I
> can see for insisting that it be rigid plastic all the way to the cap - or
> did I miss a requirement somewhere?    [:oj
> Ernest
>
>
>
>
>
>
> ----- Original Message ----- 
> From: "Bill Washington" <bill.washington at nec.com.au>
> To: <diy_efi at diy-efi.org>
> Sent: Tuesday, August 28, 2007 5:01 PM
> Subject: [Diy_efi] Re: Diy_efi Digest, Vol 30, Issue 9
>
>
> > Clair,
> >    In adding any fittings to the fuel tank the most important thing is
ya
> > just gotta have a perfect seal!
> > ... Obvious I know, but fuel tanks, lines and couplings I am very wary
of
> > and careful with! ... fuel leaks are no laughing matter, be careful!
> > I would tend as far as possible to use a "belt and braces" approach to
any
> > such mods, and not rely on a single sealing method .....
> >
> > Regards
> > Bill
> >>
> >>
> >> Hmm... interesting.  I hadn't really thought about bending the plastic
> >> pipe,
> >> just using it for the straight runs with formed
> >> rubber/silicone/neoprene/whatever hose bits to make the turns.  That
> >> might
> >> give me some options on how to handle things, though.
> >>
> >> With regard to the brass or polyethylene fittings, should I tap threads
> >> in
> >> to the tank before installing, or will the fittings cut their own
threads
> >> and seal better that way?  I can see how the brass MIGHT cut it's own
> >> threads, but I'm guessing the poly fittings need threads to even start.
> >> I'm
> >> guessing the pipe thread will be sufficient in sealing itself, correct?
> >> Would it be possible, or even necessary, to do a bit of plastic welding
> >> on
> >> the poly fitting to make it that much of a tighter fit?
> >>
> >> Thanks for the ideas, folks...
> >>
> >> Clair
> >>
> >>   man/listinfo/diy_efi
> >>
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