Gas Tank Sending Unit

Q: Gas Tank Sending Unit

I’m replacing the gas tank on my 1968 Firebird 400 and have located a sending unit. However, I’m being asked to select between a one or two tube unit. Can anyone help me with this selection without first removing the gas tank ??? I’d like to have all my parts before I remove the tank.

A: Look under your car near the front of the gas tank. If there are two lines coming from the take you need the two tube unit… If one line, the one tube.

A: There is multiple ways you can tell which sending unit you have in the car right now. The fuel lines connect to the sending unit on the right side of the tank new the front of the tank. Now, look there and see if you one or two lines coming back from the engine compartment. Cars with two lines require the two line sending unit, (one line is fuel, the other is a vapor return. If you don’t want to crawl under the car, look under the hood a the fuel punp. If you see THREE connections on the pump, you need the two line sending unit. (Connection 1 to the carb, connection 2 is the fuel line from the tank, and connection 3 is the vapor return line to the tank). If you see two lines connected to the fuel pump, you need the one ine sending unit, (Connection 1 to the carb, connection 2 is the fuel line from the tank.)

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