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Global Mod,
Mod | | | Forums66 Topics128,089 Posts1,056,004 Members48,430 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: May 2016 Posts: 26 'Bolter | | 'Bolter Joined: May 2016 Posts: 26 | I have a fairly original 49 that has what I think is the original tank. Maybe not. It has a drain plug hole on the front passenger side (bottom) of the tank. Anyone know what the thread size is? The plug is long gone. Thanks | | | | | Joined: Dec 2013 Posts: 26 'Bolter | | 'Bolter Joined: Dec 2013 Posts: 26 | I can check a tank that I have to see for sure, but my guess would be that it is most likely a pipe thread in order to seal the hole tightly. I have a look at mine to see if I can determine a size.
Life is good on Windy Ridge!
| | | | | Joined: Feb 2019 Posts: 4,476 AD Addict & Tinkerer | | AD Addict & Tinkerer Joined: Feb 2019 Posts: 4,476 | My tank located behind the seat is 1/8” NPT. However it’s located on the bottom center of the tank and not the passengers side.
EDIT: my appologies, I missed the part that this is for a panel. Different tanks. The drain however,might be the same thread.
Last edited by Phak1; 12/13/2023 3:12 PM.
Phil Moderator, The Engine Shop, Interiors and Project Journals1952 Chevrolet 3100, Three on the Tree, 4:11 torque tube Updated to: ‘59 235 w/hydraulic lifters, 12v w/alternator, HEI, PCV and Power front Disc BrakesProject JournalsStovebolt Gallery Forum | | | | | Joined: Apr 2020 Posts: 322 Professional procrastinator | | Professional procrastinator Joined: Apr 2020 Posts: 322 | I have 2 of those tanks here. I will see if I can get the plug out for you. They are not so easy to remove after 70+ years
1947.2 GMC 1/2T SWB panel
1947.2 GMC 1/2T long bed
1948 GMC 1/2T short bed
| | | | | Joined: Apr 2020 Posts: 322 Professional procrastinator | | Professional procrastinator Joined: Apr 2020 Posts: 322 | It is going to take some soaking and some heat. Neither one are budging.
1947.2 GMC 1/2T SWB panel
1947.2 GMC 1/2T long bed
1948 GMC 1/2T short bed
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