CUTLASS Gas tank and peripheal GM part numbers for 2-door Cutlass/Hurst/442

69hurstolds

Geezer
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Jan 2, 2006
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88hurstolds post about his new gas tank install got me thinking about this.

I forgive him for using the "wrong" front bolts per the parts information. He'll be docked 0.01 points. :) Just kidding.

The callout is for HFH M10 x 1.5 x 45.

The 11515768 bolt is 5 mm shorter at 40 mm and will definitely work, and they are GM, so nobody would ever notice, especially where it is located. The original 45mm bolt used at the time of production was oiled phosphate, and also had a type BP (unthreaded point) on the end. But, as GMSPO goes, they changed up part numbers rapidly and some bolts were substituted over a dozen times since the cars were built.

For those interested, the part numbers for the straps, sender, bolts/nuts are as follows (latest numbers I got). Some can still be had, some are discontinued or superseded. I didn't do any cross checking to see if they would interchange with any other G-body because I was too lazy, but I'm thinking at least all the tanks are pretty much different part numbers due to things such as EFI vs carb tanks would be, and some different necks, etc. So do your due diligence. Also, you have to watch for bad part numbers. For example, the Pontiac G-body front strap bolt calls for a 15mm long M8 x 1.25 bolt, but uses the same M10 x 1.5 nut as the rest do. That ain't going to work. Weird.

But here they are for 81-88 Cutlass gas:

Tank - 22510103
Tank cap - 22525300
Straps (2) - 557935
Sender (comes as a "kit" with o-ring, cam, and sock- fully assembled) - 25001612 (2-line), 25001613 (3-line)
Front strap bolts (2) - 11515769 (88hurstolds used 1151768 bolts, which are 40mm long and will work. The 5769 bolts are what is called out in the parts info, 45mm long. A tad easier to start threading.)
Front strap nuts (2) - 22531616
Rear strap bolts (2) - 11508301
Rear strap bolt nuts (2) - 11500760

Just in case you need a cam/oring because the dillhole with the NOS sender you bought opened the box and lost them:
Cam - 25124032
O-ring - 22515965
 
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john87442

Master Mechanic
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Mar 9, 2021
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Geneva ohio
Great info, I bought a new tank and straps however I haven’t been able to find an install hardware kit.
 

69hurstolds

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Jan 2, 2006
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Great info, I bought a new tank and straps however I haven’t been able to find an install hardware kit.
Not sure if you'll just find an install kit anywhere. I've never seen them anyway for G-body. Dorman has a front bolt/U-nut kit, but not sure it'd work.

Rear strap bolts act like the hinge. GM bolt 11508301. You can find equivalent size of M8 X 1.25 X 75. You can still get them from GM, but they're pricey AF for some reason ($42.77 each list price). Actually no reason, really.

Not the correct color, but strong enough for sure at 10.9.

Obviously it's an M8 x 1.25 nut. The GM ones (11500760) are prevailing torque type (crimped) so they'll stay on wherever you put them on the threads. Supersession number from GM is 11516071. Cheap enough to get from the dealer for a $1.89 each. But I THINK they come in a bag of 10. They used to anyway.

As far as the front strap bolts, they're still available from GM as well. 11515768 or 11515769, your choice. M10 x 1.5 x 40 (768) or 45 (769). Either works. They list for around 10-11 bucks for a pair.

The nuts, 22531616 are sorta specialized U-nuts. They're still available from GM at around 4 bucks each, list price. Again, these used to come in a bag of 5 which they USUALLY make you buy all 5 if they order them for you. So there's that.
1698498553301.png


You can get M10 x 1.5 U-nuts (they look different from the GM ones, but will function) at the big box stores for a couple bucks each.

The fasteners are where GM gets you and beats your wallet into the ground, but NEVER skimp on fasteners as far as ratings and quality. Get the ones that fit and are of at least the OEM strength.
 
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john87442

Master Mechanic
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Mar 9, 2021
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Geneva ohio
Thanks at this point I’m ready to pay whatever just to get it installed again. I appreciate the help
 

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