Fuel tank neck installation

Ribbedroof

"That wagon guy"
Supporting Member
Jan 4, 2009
4,105
113
Wellston, OK
Long story short (coupe hates me), going to replace fuel tank in my Malibu. Nobody locally carries the tank with neck (RA does....$137.00 truck freight!), so I'll have to reuse the existing one.. Anybody done this successfully/ What is involved/how does one secure it to the new tank?
 

spidereyes455

G-Body Guru
Mar 6, 2013
612
93
Northeastern PA
They are soldered on. Years ago when I turned wrenches for a living a shop I worked at whenever we had a tank that we had to reuse the neck on we took them to a local radiator shop and they made quick work of it.
And you're probably better off reusing your neck, the ones on the replacement tanks never seem to work right. I know I've always had issues refueling my GP with a spectra tank and neck.
 

ck80

Comic Book Super Hero
Feb 18, 2014
2,541
113
Long story short (coupe hates me), going to replace fuel tank in my Malibu. Nobody locally carries the tank with neck (RA does....$137.00 truck freight!), so I'll have to reuse the existing one.. Anybody done this successfully/ What is involved/how does one secure it to the new tank?
Have you double checked Amazon? I've bought spectrum premium tanks with necks through them for gbodies with free shipping through prime...
 

L92 OLDS

Comic Book Super Hero
Mar 30, 2012
2,564
113
West Michigan
Long story short (coupe hates me), going to replace fuel tank in my Malibu. Nobody locally carries the tank with neck (RA does....$137.00 truck freight!), so I'll have to reuse the existing one.. Anybody done this successfully/ What is involved/how does one secure it to the new tank?
You can do this yourself without too much effort. Cut the old filler neck out of your tank with a tinsnips leaving extra material on it from the tank. When you have the filler neck out then you can safely remove the excess material. Using a pliers, mine peeled off. It appeared to be glued in (not soldered). After the filler neck was cleaned up I used JB Weld to install it in the new tank. JB Weld can safely be used with gasoline.
 
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81cutlass

Comic Book Super Hero
Feb 16, 2009
3,394
113
Western MN
I put a GN EFI tank in my GP and had the issue that each chassis has a slightly different neck location and didn't want to risk to see if a monte or GN had it in the right spot, so I did the similar thing where I bought a neckless tank and reused my factory neck.

I ran the tank out of fuel and filled it full of water. I then took a grinder and cut about an inch square piece larger than the diameter of the neck out of the top of the tank. Obviously I wouldn't use a grinder if I hadn't filled the tank full of water and let any vapors evaporate.

I then took the neck and stuck it in a bench vise and took a propone torch and melted all the solder out and pulled the square sheetmetal tank portion off the neck.

Assembled the old neck to the new tank, marked position with a sharpie, and brought it to the local radiator shop for them to silver solder. I think it was $20 or something. I just didn't have silver soldering supplies at the time.
 

Ribbedroof

"That wagon guy"
Supporting Member
Thread starter
Jan 4, 2009
4,105
113
Wellston, OK
So the neck was soldered in (not nearly as much as I would have expected).

Old tank had a decent paint job on it all around, but was pretty rusty looking inside. I wonder if somebody had it vatted. I have heard that sometimes it strips all the coating off the steel, and leads to rust problems due to condensation. The car sat 5 years that I know of.

Made a few discoveries...the hardlines appear to have been wrestled around in the past, they're just flopping around behind the floor bracke. The ground wire appears to have been jerked off the body.....didn't see the screw anywhere. JB welded the neck into the new tank, won't have a new sender (another discovery, feed line was loose) until Sunday.

Does anyone have a good picture of the hardlines as they are supposed to be above the tank? And an idea of where the ground wire is screwed to the body?

I may just shorten the hardlines and run longer hose to the sender...any reason not to?
 
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oldsmobile joe

Royal Smart Person
Nov 12, 2015
1,708
113
mpls
i don't have any good pics but i know on my 79 cruiser wagon the ground wire is attached behind the tank. between the tank and the bumper.
 
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