Katerina Swanson
The fuel lines going into a Chevy fuel tank are a complex system. The lines are responsible for delivering fuel to the engine and returning any unused fuel back to the tank. There are also fuel vapour lines, which are responsible for recovering fuel vapour and returning it to the tank. Some Chevy models, such as the 70 tank, have a simpler fuel line setup, while others may have multiple outlets and lines. Understanding the routing of these lines is essential for proper maintenance and repair of the fuel system.
| Characteristics | Values |
|---|---|
| Number of lines | 3 |
| Line 1 | Goes to the bigger outlet port |
| Line 2 | Comes from the front of the truck |
| Line 3 | Comes from the fuel vapor recovery |
| Fuel pump location | In or near the tank |
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What You'll Learn
Fuel lines and return lines go through the sending unit
The fuel line and the smaller return line go through the sending unit. The 70 tank w/o EEC has no lines coming out of it. The 70 tank has two outlets on the right side and one on the left. The fuel line feeds the fuel pump and the return line comes back from the sending unit.
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The fuel line setup for a 70 tank w/o EEC
A fuel line diagram may be useful to determine which line goes where. The fuel line setup for a 70 tank w/o EEC will have one bigger line which goes to the bigger outlet port. There will also be a line coming from the front of the truck and a line coming from the fuel vapour recovery.
It is important to consider the pressure on the line in the event of a side impact. If there is positive pressure on the line between the tank and engine, there is a risk of the line fracturing in a side impact. This is more likely with fuel injection or an electric fuel pump mounted in or near the tank. With a mechanical or electric fuel pump near the engine, the line will have negative pressure and will just draw air into the line if it gets fractured.
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The fuel line setup for a 70 tank with EEC
For those with a 70 tank, it is important to remember to order a new fuel cap and ensure it is a vented one. The fuel line and the smaller return line go through the sending unit.
A user on a Chevy Nova Forum noted that using the 70 tank without EEC will be simpler, as it only involves two lines - one to feed the fuel pump and one return line. However, another user pointed out that there are no lines coming out of the 70 tank without EEC.
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Fuel line routing between the tank and the engine
The fuel lines going into a Chevy fuel tank will depend on the model of the car. For example, the Chevy Nova has two outlets from the right side of the tank that go up into the EEC box, and a single outlet on the left that transverses the tank and then goes up towards the box. The Chevy Tri Five has a fuel line routing from the tank to the pump.
If you are replacing the in-tank fuel pump, there will be three lines going to it. One bigger line goes to the bigger outlet port, and the other two are a line from the front of the truck and a line from the fuel vapour recovery.
If you are using the 70 tank w/o EEC, there are no lines coming out of the tank. The fuel line and the smaller return go through the sending unit. You will need to order a new fuel cap for the 70 tank, and make sure it is vented.
If you are using a mechanical or electric fuel pump near the engine, the line will have a negative pressure and will just draw air into the line if it gets fractured.
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Fuel lines and the fuel pump
In a Chevy fuel tank, there are typically multiple lines going into the fuel pump. One of these lines is the fuel line itself, which supplies fuel from the tank to the pump. There may also be a smaller return line that goes through the sending unit, as well as a fuel vapor line. The fuel vapor line is connected to the evaporative emissions control (EEC) system, which helps to control and reduce fuel vapour emissions.
It is important to ensure that the correct fuel lines are connected to the appropriate ports on the fuel pump. In the case of a Chevy fuel tank, one of the lines is usually larger and connects to a bigger outlet port on the pump. This line likely carries the fuel from the tank to the pump. The other lines may include one that comes from the front of the vehicle and another that is connected to the fuel vapour recovery system.
When working with fuel lines and the fuel pump, it is crucial to follow proper safety procedures. Always refer to the vehicle's service manual or seek professional assistance if you are unsure about the correct line routing or connections. Additionally, be mindful of potential hazards, such as the risk of a fuel line fracturing in a side-impact collision, especially if there is positive pressure in the line.
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Frequently asked questions
The fuel vapor line is a line that goes into a Chevy fuel tank.
The fuel vapor line helps to prevent fuel vapour from escaping into the atmosphere.
There are usually three lines that go into a Chevy fuel tank: one bigger line and two smaller lines.
The two outlets from the right side of the tank go up into the EEC box. The single outlet on the left transverses the tank and then goes up towards the box as well.
Yes, the fuel vapor line is necessary to prevent fuel vapour from escaping.
