New gas tank and sending Unit

[Bigboy1063]

Hello everyone,

So moving along with my project 1967 Dodge dart GT, I’m replacing my old fuel tank with a new one that comes with a sending Unit as well. When it arrived the sending unit is a little bit different from the original factory one. The external portion of the factory one has one fuel line connection and an electrical connection. The new one has two fuel connections. It looks like and the electrical connection. So I’ve done some research and I’m getting split decisions as to what to do with that extra line coming out of the sending unit. Some are saying that it’s a return fuel line, but that looks like it’s for later models others are saying it’s just a vent line that I need to run up along the filler spout. The options that I’m finding is to just cap the line as it’s not needed for my year, or to just run a lineup as a vent line. Does anyone have any suggestions?

 

[Murray]

Did you ask the manufacturer?

 

[BrianT]

If your new tank has a vent on top, you can cap off the return nipple. If it doesn't, I would use the extra nipple to vent the tank by running a rubber hose up above the tank. The extra nipple is nice if you decide to upgrade later and run a return type system.

Also, watch the seal on the sending unit. It's a known flaw that the reproduction lock rings are stamped out of thinner metal and don't seal as well as the original. Hopefully you still have your original lock ring, if not a member has them for sale here on FABO.

 

[Bigboy1063]

If your new tank has a vent on top, you can cap off the return nipple. If it doesn't, I would use the extra nipple to vent the tank by running a rubber hose up above the tank. The extra nipple is nice if you decide to upgrade later and run a return type system.

Also, watch the seal on the sending unit. It's a known flaw that the reproduction lock rings are stamped out of thinner metal and don't seal as well as the original. Hopefully you still have your original lock ring, if not a member has them for sale here on FABO.

Thanks for your input!!! Yeah, I was thinking just to be safe, I was just going to run some fuel line up along the filler and put one of my extra fuel filters on the end to keep debris out of it. Also, thanks for the heads up on the rubber gasket! Funny, I was tearing down the box that the gas tank came in and was surprised to see a rubber gasket tape on the inside of the box! I’ll use that one for sure since it came with the gas tank. Thank you again!

 

[Vaanth]

Hello everyone,

So moving along with my project 1967 Dodge dart GT, I’m replacing my old fuel tank with a new one that comes with a sending Unit as well. When it arrived the sending unit is a little bit different from the original factory one. The external portion of the factory one has one fuel line connection and an electrical connection. The new one has two fuel connections. It looks like and the electrical connection. So I’ve done some research and I’m getting split decisions as to what to do with that extra line coming out of the sending unit. Some are saying that it’s a return fuel line, but that looks like it’s for later models others are saying it’s just a vent line that I need to run up along the filler spout. The options that I’m finding is to just cap the line as it’s not needed for my year, or to just run a lineup as a vent line. Does anyone have any suggestions?

A 1967 Dodge Dart GT vents the fuel tank with a specifically bent tube that attaches to a nipple on the upper end of the filler tube inside the trunk and exits through the floor seal under the car as shown in the following images:

The two tube fittings on the sending unit provided with the new fuel tank are used as follows:

- 5/16" tube angling upward is for the fuel line to the fuel pump.
- 1/4" tube angled or straight is for some 1975 and 1976 A-bodies with the return fitting on the fuel filter and a return line to the tank.

To use this sending unit in the 1967 Dart, cap the 1/4" return line tube or run a return line and use a three fitting filter such as Wix 33054. The fitting on the sending unit sits too low to be used as a vent line. Use the factory vent setup, or switch to a later non-ECS (evaporative control system) fuel tank with a single attached vent nipple. Note if using a later tank, that later tanks mount differently than 1967, although some are configured to work with both mountings, and there is a filler position spacing difference with some.

Later non-ECS tanks mounted a vent line in the upper front center of the tank as shown in the following image:

Following is an original Chrysler dual fitting sending unit for a 1975-1976 A-body:

 

[Bigboy1063]

A 1967 Dodge Dart GT vents the fuel tank with a specifically bent tube that attaches to a nipple on the upper end of the filler tube inside the trunk and exits through the floor seal under the car as shown in the following images:
View attachment 1716443141
View attachment 1716443140

The two tube fittings on the sending unit provided with the new fuel tank are used as follows:

- 5/16" tube angling upward is for the fuel line to the fuel pump.
- 1/4" tube angled or straight is for some 1975 and 1976 A-bodies with the return fitting on the fuel filter and a return line to the tank.

To use this sending unit in the 1967 Dart, cap the 1/4" return line tube or run a return line and use a three fitting filter such as Wix 33054. The fitting on the sending unit sits too low to be used as a vent line. Use the factory vent setup, or switch to a later non-ECS (evaporative control system) fuel tank with a single attached vent nipple. Note if using a later tank, that later tanks mount differently than 1967, although some are configured to work with both mountings, and there is a filler position spacing difference with some.

Later non-ECS tanks mounted a vent line in the upper front center of the tank as shown in the following image:
View attachment 1716443148


Following is an original Chrysler dual fitting sending unit for a 1975-1976 A-body:
View attachment 1716443150

Wow, that’s great information. Thanks for all the help guys. This will get me through another stage of this rebuild again appreciate it.

 

[BrianT]

The rubber gasket isn't the problem, it's the metal lock ring. Use the original one that was on there and save yourself a headache. Many stories here, including my own, of the first time you fill up the tank and gas comes pouring out around the sending unit. Good luck!