[Gmecm] dual tank issue

[Gary Evans]

They had switching valves on the supply and return lines, before the  
external fuel pump. Since the valves are on the low pressure side,  
it's the same valves they used for carburetor cars.



On Feb 9, 2006, at 1:42 PM, mark krawczuk wrote:

> hi what about  `71 jag,  they had dual fuel tanks, i can remember  
> what set up they had,  but it cant be that hard to connect up, i  
> think they had one way valves  ?
>
> mark k
>
> ----- Original Message ----- From: "Tim Ganger"  
> <timganger at tganger.com>
> To: <gmecm at diy-efi.org>
> Sent: Friday, 10 February 2006 6:59 AM
> 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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