[Gmecm] dual tank issue

[Don Sauman]

The issue appears to be the return fuel in a dual tank system.
A similar problem was solved in Landrovers in which twin tanks were 
fitted ca. 1993. I quote:

"When two fuel tanks are fitted, a dashboard-mounted switch allows the 
driver to select which tank fuel is drawn from by energising the 
appropriate fuel pump when the ignition is switched on. The selector 
switch has two additional functions. Firstly it connects the fuel gauge 
to the appropriate tank level indicator so that the fuel level displayed 
is that in the tank in use. Secondly, it activates a solenoid valve in 
the spill return pipe so that unused fuel returned from the vapour 
separator goes to the tank in use. The solenoid valve is a 
non-repairable unit which must be renewed if malfunctioning. A 
non-return ball valve is incorporated in the hose connection of the 
supply pipe from each tank to prevent any back-flow of fuel in the 
supply lines and consequent cross-feeding from one tank to the other."

I hope that helps.

Cheers
Don

Tim Ganger wrote:

>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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-- 
Don Sauman
35 Asteroid Way
Carlisle 6101
Western Australia

P: 08 9361 0337
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