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Under bed gas tank installation 1950 3100
#1393131 Sun Jan 17 2021 10:27 PM
Joined: Jun 2020
Posts: 70
C
1950 Chevy 3100 216 3 Speed.
I am in the process of installing an under bed fuel tank in my 1950 3100 Chevy Truck. The tank came from the Truck Shop in Orange CA and produced my CounterParts. I was told that I would not need to move the rear brake line support. That turned out to not be true. Live and learn. So the bracket is removed and I will relocate it, not really a big deal.

Is there an installation for this gas tank somewhere on the internet?

But now I have other installing questions. My general question is can I drill the holes now, not having the bed in place? I am thinking no. It would have been nice if the brackets were slotted to allow some left to right positioning.

Next, I only need one port out of the tank to feed the fuel pump. There are two, why? There is also a port on the top of the tank. Is this for some sort of breather?

Any suggestion on setting up a breather?

Schematics welcome.

Attached Files
D2D0DF78-8155-46F4-8269-BF4E9FED0FBB.jpeg (252.35 KB, 279 downloads)
F1152404-43E8-4528-A8F2-DB32978F5C20.jpeg (289.01 KB, 274 downloads)
C542DD6B-ACA8-4814-82D7-9C32A0D551B8.jpeg (180.28 KB, 271 downloads)
36F9F083-F510-4AC1-B866-03A5839508AF.jpeg (277.23 KB, 266 downloads)
Last edited by ChevyDarren; Mon Jan 18 2021 07:15 PM. Reason: Added some pictures

Darren
Current Project - 1950 3100 5 Window with a rebuilt 216 and 3 speed trans
Re: Under bed gas tank installation 1950 3100
ChevyDarren #1393142 Sun Jan 17 2021 11:46 PM
Joined: Apr 2005
Posts: 9,909
Grease Monkey, Moderator General Truck Talk & Greasy Spoon
Extra are for fuel injection return lines.


Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne 4dr 230 I-6 one owner (I’m #2) “Emily”
‘39 Dodge Businessmans Coupe “Clarence”



"I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line"! Hug a cop!
USAF 1965-1969 Weather Observation Tech (I got paid to look at the clouds)

Re: Under bed gas tank installation 1950 3100
ChevyDarren #1393197 Mon Jan 18 2021 08:57 AM
Joined: Feb 2001
Posts: 6,968
W
'Bolter
The mistake that was made on my installation was the side brackets were installed on top of the frame rails instead of under. So if I need to remove the tank I have to take the bed off or replace the bed wood. Which BTW I would like to do that. On mine, the extra line I was told is a vent.


Ron, The Computer Greek
I love therefore I am.

1960 MGA Roadster Sold 7/18/2017
1954 3100 Chevy truck in the Gallery
2017 Buick Encore
Pix on Photobucket
Re: Under bed gas tank installation 1950 3100
ChevyDarren #1393310 Mon Jan 18 2021 11:12 PM
Joined: Mar 2004
Posts: 5,136
M
'Bolter
If that's the fill hole 'top center', where does the sending unit go?

If I were doing it I'd want the tank to be installed so I could drop it later without removing the bed.

Mike B smile

Re: Under bed gas tank installation 1950 3100
ChevyDarren #1393384 Tue Jan 19 2021 04:08 PM
Joined: Jun 2020
Posts: 70
C
1950 Chevy 3100 216 3 Speed.
Yes, the top center hole is where the sending unit goes. I will install the tank so it can be "easily" dropped. There is nothing easy about it because the leaf springs get in the way of the tabs used to bolt the tank to the frame. But with that said, that is good advice. The filler hole is in the lower left corner of the photo. It sure would be nice if someone had a layout of where the center of the filler spout should be positioned from the center point of the frame. I think that location is 17 1/16" from the center of the frame. That should land the 3" diameter filler plug assembly exactly in the center of the second board from the left bed wall. But is sure would be nice if the tabs on the tank were slotted so you could make any slight adjustments (left or right) necessary to hit the location spot on.


Darren
Current Project - 1950 3100 5 Window with a rebuilt 216 and 3 speed trans
Re: Under bed gas tank installation 1950 3100
ChevyDarren #1393386 Tue Jan 19 2021 04:27 PM
Joined: Apr 2005
Posts: 9,909
Grease Monkey, Moderator General Truck Talk & Greasy Spoon
If you have room on the mounting flanges, just use a rotary file and make the mounting holes slotted.


Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne 4dr 230 I-6 one owner (I’m #2) “Emily”
‘39 Dodge Businessmans Coupe “Clarence”



"I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line"! Hug a cop!
USAF 1965-1969 Weather Observation Tech (I got paid to look at the clouds)

Re: Under bed gas tank installation 1950 3100
ChevyDarren #1393410 Tue Jan 19 2021 07:45 PM
Joined: Jun 2020
Posts: 70
C
1950 Chevy 3100 216 3 Speed.
I think this may be the best solution!


Darren
Current Project - 1950 3100 5 Window with a rebuilt 216 and 3 speed trans
Re: Under bed gas tank installation 1950 3100
ChevyDarren #1393427 Tue Jan 19 2021 09:29 PM
Joined: Apr 2002
Posts: 79
K
'Bolter
Thanks for the pics! I always wanted to know where these tanks fit on a shortbed 3100. Now if they came with a side fill, that would be perfect. I always thought the bed fill was just a poor idea (picture you are hauling a full bed of furniture a long distance and have to unload it to fill up the tank!).

It should be easy to get a fill tube through the rear fender with a weld in door for a side fill. Just I have not seen a tank that offers the side fill. frown


51 Chevy 3100 Jigsaw puzzle
69 Camaro SS350 convertible
69 Camaro 327 convertible
Re: Under bed gas tank installation 1950 3100
ChevyDarren #1393430 Tue Jan 19 2021 09:51 PM
Joined: Oct 2009
Posts: 170
J
'Bolter
one would think with all of the ad trucks that have been built over time there would be plenty of information out there on how to do these installations from fuel tanks to front suspension to brake booster/master cylinders swaps. It seems to me the companies that sell these kits are sooo skimpy and vague on instructions it's almost pitiful.

Re: Under bed gas tank installation 1950 3100
KevinW #1393454 Wed Jan 20 2021 12:00 AM
Joined: Jun 2020
Posts: 70
C
1950 Chevy 3100 216 3 Speed.
I believe LMC makes a side fill. Once I get this truck finished I never intend to haul anything in the bed again. So the bed fill makes good sense. Also the reason for having the tank under the bed and filling from the top is to preserve a those beautiful curves the 3100 series has. As will has getting the fuel tank out from behind the back seat! Now that I think back of all those times I rode in that truck and my grandfather had is pipe glowing. Not sure what was more hazardous, the second smoke, or the chance we could have both been blow to pieces!


Darren
Current Project - 1950 3100 5 Window with a rebuilt 216 and 3 speed trans
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