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Old 07-29-2021, 09:57 AM   #126
aggie91
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Re: 1973-1991 Dual fuel tank systems theory of operation

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Originally Posted by aotte1 View Post
Thanks for sharing your knowledge on this subject. 1986 K10 short bed, needs right side tank replaced, suggestion on good replacement tank, and/or key factors to look for.

Thanks,
Les
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Originally Posted by rodstored-72 View Post
aotte1, this is the tank I purchased for my '86 2wd swb for a LS conversion. this is a 16 gal tank for shortbed purpose. you will need to get a 20 gal tank for a longbed...
link:https://www.amazon.com/Spectra-Premi...+Chevrolet+C10

hope this helps.. good luck
If you are using fuel injection with an in tank pump, the GM11C for short bed or the GM1C for a long bed is a preferred tank as it has a baffle around the pump to help keep fuel at the pump when the level is low.

Long bed version:
https://www.amazon.com/Spectra-Premi...+Chevrolet+R10


Otherwise for a regular carb set up, the GM1B tank is the one for the long bed.
https://www.amazon.com/Spectra-Premi...+Chevrolet+C10
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Old 07-29-2021, 11:00 AM   #127
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Re: 1973-1991 Dual fuel tank systems theory of operation

aggie (aotte1),
I believe I linked to a different tank than what I purchased, I believe I did purchase the GM11C tank, because I wanted the baffle for the pump. I apoligize for any confusion.
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Old 07-29-2021, 01:27 PM   #128
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Re: 1973-1991 Dual fuel tank systems theory of operation

I'm converting my 85 to 87 for my efi. Purchased D/S (Main) tank and sending unit. It appears the P/S sending unit remains impossible to find. I read in the description on one of the sites that the difference was which way the outlet hose barbs are pointing and that may be why they are not interchangeable?

So they question becomes, if the hose barbs are made (whatever means) to point inward (away from the frame) would it work on the P/S? I have no problem with fabrication skills.
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Old 07-30-2021, 09:19 AM   #129
aggie91
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Re: 1973-1991 Dual fuel tank systems theory of operation

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Originally Posted by SunSoaked View Post
I'm converting my 85 to 87 for my efi. Purchased D/S (Main) tank and sending unit. It appears the P/S sending unit remains impossible to find. I read in the description on one of the sites that the difference was which way the outlet hose barbs are pointing and that may be why they are not interchangeable?

So they question becomes, if the hose barbs are made (whatever means) to point inward (away from the frame) would it work on the P/S? I have no problem with fabrication skills.
Short answer is yes. If you can rework the steel lines to point back toward the frame, then it will work. I am thinking that if you just add a 180 bent tube to the end of each existing tube, that will work.
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http://67-72chevytrucks.com/vboard/s...d.php?t=372424

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http://67-72chevytrucks.com/vboard/s...=1#post7812257

Korbin's 1st Square: "Sunburn"
http://67-72chevytrucks.com/vboard/s...d.php?t=418618

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Old 07-30-2021, 02:51 PM   #130
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Re: 1973-1991 Dual fuel tank systems theory of operation

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Short answer is yes. If you can rework the steel lines to point back toward the frame, then it will work. I am thinking that if you just add a 180 bent tube to the end of each existing tube, that will work.
Thank you.
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Old 08-01-2021, 05:22 PM   #131
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Re: 1973-1991 Dual fuel tank systems theory of operation

Rodstored-72 and Karl,
Thanks for the help on the auxiliary fuel tank replacement. Which one to buy. Our new to us 1986, K10 short bed has a bad aux fuel tank. This info will let me get a good replacement. For now going with a carb set-up.
Will remove bad tank this week and power wash underside of cab/bed, to remove last of mud.

Les
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