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Old 07-04-2018, 05:52 PM   #1
nitrosport_5
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Suburban extended fuel tank sending unit

Does anyone recognize this fuel tank, or is it a custom made part? It is in my 72 gmc k1500 suburban and has needed a new sending unit ever since i bought it. I would like to be able to order the parts and have them here so this thing isnt in pieces in my shop for weeks while i wait for parts. Do you think it just uses a stock suburban sending unit? Thanks
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Old 07-04-2018, 08:28 PM   #2
Bigdav160
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Re: Suburban extended fuel tank sending unit

A very popular upgrade installed at many dealers. I forget the name of the manufacture. I think they still might be in business.

The sending unit looks like many universal sending unit except it has a fuel line drilled and soldered into it.
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Old 07-05-2018, 12:35 PM   #3
PortHeadlight
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Re: Suburban extended fuel tank sending unit

I have the same fuel tank in my Suburban. Original sending unit was not fixable. Lots of research, and unable to find a replacement in right ohm category that also had a fuel line pickup tube. Lots of options for sending unit alone that fit with the required mounting holes and screw placements (see marine suppliers as well as automotive). Bottom line. I bought a universal fit for the sending unit alone and fabricated a separate 1/4 inch fuel pick-up tube.

My tank was still in use and mounted when I did this. Was careful when drilling hole for pickup tube to capture all the filings underneath with a small cloth "net" I made with a coat hanger frame... then also dragged bottom of tank with a magnet on a coat hanger to pickup a few smaller metal filings. You can see in tank with a small flashlight. HA!!

Could get more specific if you wish.
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Old 07-06-2018, 03:47 AM   #4
Bgrdmoose
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Re: Suburban extended fuel tank sending unit

I sent my non working one to a place called tri-star in upstate New York. He made me a new one.
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Old 07-06-2018, 01:20 PM   #5
nitrosport_5
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Re: Suburban extended fuel tank sending unit

Thanks for the replys. Looks like a replacement wont be as straightforward as i was hoping. Ill have to pull it apart and see what i can come up with.

any idea what the capacity is? i just have always kept it full so ive never had to put more than 10-15 gal in it, looks like it holds about 35-40?
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"1968" C10 Shortbed project
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Old 09-08-2018, 01:43 PM   #6
Killer Bee
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Re: Suburban extended fuel tank sending unit

eta: different tank after all.. my apologies..

here's the thread I started about the tank I have.. 50 Gallon Suburban Fuel Tank

may be some useful info there for the op regarding capacity and fuel sender..

for reference, there's 231 cuin in a gallon.. measure all sides of your tank like I illustrated in my thread to determine total capacity..

for the angled portions, square off a triangle and use this formula; volume of triangular prism

sorry for the intrusion, hope something there helps, good luck!
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Last edited by Killer Bee; 09-08-2018 at 02:39 PM. Reason: oops, different tank
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Old 09-15-2018, 10:12 PM   #7
bntmotorcycles
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Re: Suburban extended fuel tank sending unit

I have 2 of these tanks. They hold about 45 gal. I had the same problem with sending units. I ordered sending units from a hot rod shop on eBay. It's just a generic unit with the correct ohms. Follow the instructions to adjust. I think I took the top plate off the old unit fitted it to the new unit. It was very easy and didn't take very long. It is super accurate, like to quart or so. I really like mine. But it's crazy expensive when you let it get empty.
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