Fuel tank differences/interchange

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pontiacgp

blank
Mar 31, 2006
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Kitchener, Ontario
I have a TBI Monte tank in my 85 4 door. The only issue I've seen is the tag bracket being pushed out a little- easy fix.
I'm pretty sure the senders are the same fitment with the difference being the pump provision.

I have an 85 GN tank with the pump and it looked identical to the tank I removed. I removed the pump to inspect it and the tank was the same as my tank with the sender
 

383_StealthRam

Greasemonkey
Dec 29, 2016
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It's definitely the filler neck differences from my experience. I put in a GN replacement tank from Spectre since it had the front/rear and side to side baffling my original carb tank did not have. Always had the < quarter tank, scooting around turn fuel starvation issue as a result. I know some are not fans of Spectre but I've had mine in car for 12+ yrs, and it's held up nice with no paint, or undercoating on it. It accepted the Racetronix GN Sender with Walbro Pump just fine (also 12 yrs ago) and been great as well.

So here's a pic of the Spectre tank with the three different filler necks offered (you can buy them separately) and then solder in the one you need. I have a friend that swapped in a GN tank directly to a Cutlass (like mine) and the neck would rub the bumper cover behind the license plate door because of the angle/shape of the neck.

HTH

GN Tank and Necks.JPG
FPS-G7RXP340M.jpg





Screenshot_20200111-083223.png
 
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383_StealthRam

Greasemonkey
Dec 29, 2016
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so that spectre tank you have pictured will fit my 1980 olds cutlass? i am thinking of putting f.i in and ditching the carb.

That I can't tell you with certainty, you will need to look up the right application for your specific vehicle. In my cases, we have the OEM application for Buick GN that is an EFI car (with additional in tank slosh baffling), and we know the fuel tank (filler neck notwithstanding) will direct "swap" into another similar year(s) G-Body (ie; 84-87? Cutlass, Monte, Grand Prix). I've heard that some year Monte Luxury Sport (LS) years with 4.3L TBI EFI have similar swappable tank with other G Bodies too, but YMMV.

I would do your research on what your options are out there both OEM (swap), and perhaps an aftermarket/custom EFI compatible tank.

Here's the Spectra online catalog and a good place to start imho.


HTH
 
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JAMCAR223

Royal Smart Person
Jun 6, 2014
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Houston, TX.
It's definitely the filler neck differences from my experience. I put in a GN replacement tank from Spectre since it had the front/rear and side to side baffling my original carb tank did not have. Always had the < quarter tank, scooting around turn fuel starvation issue as a result. I know some are not fans of Spectre but I've had mine in car for 12+ yrs, and it's held up nice with no paint, or undercoating on it. It accepted the Racetronix GN Sender with Walbro Pump just fine (also 12 yrs ago) and been great as well.

So here's a pic of the Spectre tank with the three different filler necks offered (you can buy them separately) and then solder in the one you need. I have a friend that swapped in a GN tank directly to a Cutlass (like mine) and the neck would rub the bumper cover behind the license plate door because of the angle/shape of the neck.

HTH

View attachment 133182 View attachment 133184




View attachment 133185
That's what I'm talking about... Thanks for posting the pics. of the different filler necks
 
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JAMCAR223

Royal Smart Person
Jun 6, 2014
1,853
5,507
113
Houston, TX.
So how do you remove a filler neck, and install a new one?
 

TURNA

Rocket Powered Basset Hound
Jul 24, 2009
10,941
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Socialist NY

fleming442

Captain Tenneal
Dec 26, 2013
13,046
24,216
113
so that spectre tank you have pictured will fit my 1980 olds cutlass? i am thinking of putting f.i in and ditching the carb.
I'm not a fan of the OE style EFI tank baffling. I'll be looking toward the aftermarket next time around.
 
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Streetbu

Know it all, that doesn't
Supporting Member
May 22, 2011
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Central NY
Use your existing tank, a GN sending unit, and a Holley Hydramat instead of worrying about a sump... JMO
 
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