[Gmecm] dual tank issue

Sat Feb 11 01:22:25 UTC 2006

I would look at a 3500 crew cab up to about 90 91 on the right frame rail at the back of the cab switch valve 4 in 2 out  made of some type of plastic .I work at a wrecking yard so I picked up a fresh truck with 2 tanks did not look at the switch on the dash but there was several wires on the valve. 

-----Original Message-----
From: Carl Rumberger <perfdyn at cwnet.com>
To: gmecm at diy-efi.org
Sent: Fri, 10 Feb 2006 07:44:19 -0800
Subject: Re: [Gmecm] dual tank issue

The information I have is the 87-91 carbureted & TBI trucks used a 4
terminal dual pole dual throw rocker switch (D7089C - #15599081) and a motor
type switch-over valve(not solinoid) that included a fuel level sender
switching circuit and switch-over current control (#15548879). This system
was very similar to the previous carbureted trucks with the exceptions of
the rocker switch no longer is a momentary type switch and once the
switch-over valve is in commanded position, the unnecessary current flow is
ended by an switch and diode circuit within the switch-over valve itself.
The left & right fuel level circuit switching is handled internally by the
switch-over valve.

----- Original Message ----- 
From: "Scott Pearson" <mrcad472 at iowatelecom.net>
To: <gmecm at diy-efi.org>
Sent: Thursday, February 09, 2006 2:34 PM
Subject: Re: [Gmecm] dual tank issue

> A friend of mine has an 87 K10, 5.7L TBI with dual tanks. 65,000 mile
> original truck.
>
> Scott
>
> ----- Original Message ----- 
> From: "Tim Ganger" <timganger at tganger.com>
> To: <gmecm at diy-efi.org>
> Sent: Thursday, February 09, 2006 2:29 PM
> Subject: RE: [Gmecm] dual tank issue
>
>
> >
> > GM Pickup's that were equipped with TBI with out exception had one fuel
> > tank. Not until you get to the larger trucks i.e. C50-70 series did they
> > have duel tanks. In that case the left tank was used to supply the EFI
> > system. The right tank had an electric fuel pump that transferred the
fuel
> > into the left tank. On the bulkhead you will find a "Fuel tank leveling
> > module". Basically what it did is compare the fuel senor levels. When
the
> > left tanks was 25% lower than the right the pump turned on and
transferred
> > the fuel.
> >
> > If you can find in the scrap yard a 89-95 truck, the parts should be
> > there..
> >
> > Good luck
> > Tim g
> >
> >>If you can find an 87 with dual tanks to get parts from, that would be
the
> >>best way to do it.
> >
> >>Scott
> >
> >
> >> Cory,
> >>    I've looked into this in the past.  I helped update a '75 crew cab
> >> with a '87 TBI a few years ago.  JC Whitney also has a solution for
dual
> >> tanks for fuel injected motors.  We never tried it, since we couldn't
> >> find a 2nd fuel tank locally at a wrecking yard.  Since the 1/2 tons
> >> only had fuel injection for one year with the '73 body style (saddle
> >> tanks) they turned out to be hard to find.  The senders will fit in the
> >> non fuel injected tanks, but they dont' have baffles in them to prevent
> >> the pump from cavatating during cornering and acceration.  I believe
the
> >> 3/4 ton and 1 tons used the '73-87 body for more years, but I don't
know
> >> the details.  Incidentally, my friend's truck gave up its motor to
> >> another vehicle and he is now parting it out, including one TBI fuel
> >> tank for a '73-87 truck, with a 2 yr old TBI pump and sender.  If you
> >> live close enough (we live in SE Washington State) it may be something
> >> you would want.
> >>
> >> Here's the link for the dual tank kit at JC Whitney.
> >>
> >>
http://www.jcwhitney.com/autoparts/Product/tf-Browse/s-10101/Pr-p_Produc
> >>
t.CATENTRY_ID:2005712/showCustom-0/p-2005712/N-111+10201+600002072/c-101
> >> 01
> >>
> >>
> >>
> >>
> >> -----Original Message-----
> >> From: gmecm-bounces at diy-efi.org [mailto:gmecm-bounces at diy-efi.org] On
> >> Behalf Of Cory Frey
> >> Sent: Wednesday, February 08, 2006 8:17 PM
> >> To: gmecm at diy-efi.org
> >> Subject: [Gmecm] dual tank issue
> >>
> >>
> >>
> >> Sorry if this has been asked in the past. I am new to the list and
> >> thought before I pull the rest of my receding hairline out I would ask
> >> if anyone has run into this problem.
> >>
> >>
> >>
> >> I am retrofitting an 82 chevy truck with an 88 chevy truck TBI EFI. The
> >> truck has dual tanks and I wanted to know how any of you worked this
> >> out.
> >>
> >>
> >>
> >> I saw a kit that Jeg's sells for their holley TBI to get it done.
> >> However for $200 bucks it just seems a little steep to me. If someone
> >> could point me in the right direction I would really appreciate it.
Also
> >> I might add I don't have a problem spending the $$ on the Holley
> >> solution if that's what it takes. I am just looking to get the most
bang
> >> for my $$
> >>
> >>
> >>
> >> Thank you in advance
> >>
> >>
> >>
> >> -Cory
> >>
> >>
> >
> >
>
> --------------------------------------------------------------------------
--
> > ----
> >
> >
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> >>
> >
> >
> >
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> >
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>
>
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