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Old 11-29-2014, 12:27 AM   #26
2tontruck
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Re: Will 1987-1991 blazer fuel tank work?

Does anybody have the part number of the sending unit? I plan on putting one of these in a Suburban that I am doing a LS swap on. I would guess that the sending unit is the standard 0-90ohm?
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Old 12-29-2014, 03:12 PM   #27
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Re: Will 1987-1991 blazer fuel tank work?

how can one find out which sending unit you need ? I know there is 2 inch difference from 25 to 31 gallon tank, do you measure from the pan or from bottom of the inside
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Old 01-19-2015, 11:13 PM   #28
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Re: Will 1987-1991 blazer fuel tank work?

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Originally Posted by jamesjones View Post
I'm using an '87 tank and sending unit in my '72. I put a Walbro 400 in it though.

I haven't had a chance to mount the tank yet but I looks like it should fit.
I am building a 72 K20 4x4 with lq4 4l80e and was wondering if this set up would work?

Thanks!
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Old 02-07-2015, 10:20 AM   #29
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Re: Will 1987-1991 blazer fuel tank work?

good info
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Old 10-13-2015, 10:28 AM   #30
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Re: Will 1987-1991 blazer fuel tank work?

Bringing this back up for information on the connections to the in tank pump. I don't want to run AN fittings. Looking for either a barbed fitting for EFI rubber hose or possible the newer style nylon fuel line.
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Old 10-15-2015, 09:32 PM   #31
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Re: Will 1987-1991 blazer fuel tank work?

I installed this tank in my 72 with AN Fittings. I bought the sending unit from rock auto. They had sending units that used barbed fittings as well.
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Old 10-15-2015, 09:37 PM   #32
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Re: Will 1987-1991 blazer fuel tank work?

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Originally Posted by dkauffman05 View Post
I would like to see some picture of how much these tanks hang below the truck.
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Old 10-16-2015, 12:02 AM   #33
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Re: Will 1987-1991 blazer fuel tank work?

Dorman 800-078 feed
dorman 800-079 return

Those look like they would work.
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Old 04-10-2017, 10:15 PM   #34
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Re: Will 1987-1991 blazer fuel tank work?

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Thanks for the answer. I found a replacement fuel sending unit with threaded fittings.
What sending unit did you find to get the threaded fittings?
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Old 06-23-2017, 02:19 PM   #35
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Re: Will 1987-1991 blazer fuel tank work?

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Yes it can be turned. The slanted edge on the bottom will just be facing the front instead of the back. I plan on doing it that way. I should be installing mine later this week. I'll try and post some pics of the fitment.
For anyone else looking into this the 92-96 31 gallon tank appears to be identical except the filler neck is on the opposite side but doesn't have the 90 bend on it.
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Old 07-03-2017, 11:47 PM   #36
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Re: Will 1987-1991 blazer fuel tank work?

for those who have used the 87 tank what fuel gauge did you use? i ran the 87 tank with the 87 sender and my 75 fuel gauge goes past fuel everything is brand new, any suggestions?
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Old 07-08-2017, 01:36 AM   #37
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Re: Will 1987-1991 blazer fuel tank work?

It's likely the ohm on the sender. Here's some good reading.

http://www.chevyclassicsclub.com/the...ry-1965-newer/
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Old 03-02-2018, 12:51 PM   #38
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Re: Will 1987-1991 blazer fuel tank work?

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Originally Posted by stangtjk View Post
For anyone else looking into this the 92-96 31 gallon tank appears to be identical except the filler neck is on the opposite side but doesn't have the 90 bend on it.
Yeah I'm thinking about this tank as well. https://www.1aauto.com/fuel-tank/i/1...yABEgLLPPD_BwE
Filler neck hole is on the correct side for the first gen k5. I need a tank in mine and would like to go ahead and get a bigger one that would work for a further LS swap but could also work for now with my stock 72 motor and fuel pump. Anyone know if I can buy the stock 96 fuel pump/sending unit then pull the fuel pump out and replace it with a piece of fuel line. Rely on the 72 fuel pump then, to suck from the new tank just like it does with the older set up. That way I could go back to the in the tank pump when I do a LS swap later?
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Old 03-04-2018, 01:41 PM   #39
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Re: Will 1987-1991 blazer fuel tank work?

What size is the filler neck on this tank?
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Old 03-04-2018, 03:00 PM   #40
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Re: Will 1987-1991 blazer fuel tank work?

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What size is the filler neck on this tank?
Not sure, the plan would be to have a filler neck welded on to fit the first gen if needed if the stock tahoe one wouldn’t work. Maybe pull a filler tube from one from a junkyard to save some $. I’ll buy a new tank though
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Old 03-08-2018, 11:50 PM   #41
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Re: Will 1987-1991 blazer fuel tank work?

After doing some measuring the 92-96 tank won’t fit. It’s too wide to fit between the frame rails. I measure the width between mine at 27 1/4”, the stock tank and the 87-91 tanks are a little wider than this but only with the flanges. Guess it’s back to the 87-91 for me and having the filler next swapped to the other side on the tank or turning it around.
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Old 03-09-2018, 12:43 AM   #42
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Re: Will 1987-1991 blazer fuel tank work?

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Originally Posted by findog78 View Post
What size is the filler neck on this tank?
Does this help?
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Old 03-09-2018, 08:33 AM   #43
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Re: Will 1987-1991 blazer fuel tank work?

1 3/4" looks to me. You measure the diameter below the ridge though, least I do with a caliper
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