Rajan Wilcox
Installing a 2-line fuel pump is a complex process that requires careful consideration of the vehicle's existing fuel system. The procedure involves removing the old fuel pump and making necessary modifications to accommodate the new 2-line pump, ensuring proper fuel flow and engine performance. This process can vary depending on the vehicle's make and model, with some cars requiring additional steps such as regulating fuel pressure or removing the in-tank pump. It is important to understand the differences between 2-line and 3-line fuel pumps, as well as the specific requirements of your vehicle, before attempting any installation or modification.
How to Install a 2-Line Fuel Pump
| Characteristics | Values |
|---|---|
| Installation | Directly bolts onto the intake manifold and pulse port |
| Hose requirement | 2 hoses |
| Comparison with 3-line fuel pump | Works the same way but has a different pulse source |
| Modification | Cap the return line back to the tank |
| Engine compatibility | 1972 Olds 350, 1987 El Camino, 1985 Buick Regal Limited, 1970 Olds Cutlass S |
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What You'll Learn
Understanding the difference between a 2-line and 3-line fuel pump
Installing a 2-line fuel pump involves connecting the pump to the fuel lines and the engine, ensuring proper fuel pressure, and testing for leaks. However, before installing a 2-line fuel pump, it is essential to understand the differences between a 2-line and a 3-line fuel pump to make an informed decision.
The primary distinction between a 2-line and a 3-line fuel pump lies in their design and the way they operate. A 2-line fuel pump typically has two hoses or ports: one for fuel inlet and the other for fuel outlet. This type of pump is usually mounted directly to the intake manifold and the pulse port, allowing it to draw fuel directly from the fuel tank and supply it to the engine.
On the other hand, a 3-line fuel pump features an additional line, often referred to as a return line or a pulse line. This extra line serves a specific purpose, which varies depending on the vehicle and its fuel system design. In some cases, the third line is used to recirculate hot fuel back to the tank to cool it down, helping to prevent percolation and vapor lock issues. In other instances, the third line may be connected to a charcoal canister, pulling exhaust fumes from the tank and directing them to the engine to be burned.
It is worth noting that both the 2-line and 3-line fuel pumps work similarly in terms of fuel delivery. They can provide the same amount of fuel to the engine. The key difference lies in the way the pump body is designed to receive pulses and the source of those pulses. The 2-line pump relies on direct mounting to the pulse port, while the 3-line pump uses a remote pulse source via a hose.
When deciding between a 2-line and a 3-line fuel pump, it is essential to consider the specific requirements of your vehicle's fuel system, engine configuration, and any potential benefits or drawbacks associated with each type of pump.
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Converting a 3-line fuel pump setup to a 2-line one
To install a 2-line fuel pump, you will need to understand the differences between a 2-line and a 3-line fuel pump setup. The 2-line pump mounts directly to the intake manifold and the pulse port, whereas the 3-line pump uses a remote pulse source via a hose. The 2-cylinder motors have bosses and a pulse port in the block itself, so you can simply bolt it on. On the other hand, the later 3-cylinder motors do not have the pump mounting cast into the block, so they require a 3-port pump with a hose from a pulse port.
When converting a 3-line fuel pump setup to a 2-line one, it is important to note that both types of pumps work the same way and pump the same amount of fuel. The difference lies in where the pump gets its pulse from. If your motor has a capped-off pulse port and threaded bosses, you can use the 2-port pump. Simply cap the return line back to the tank, or use a fuel return pump on the engine.
For a 3-line to 2-line conversion, you can also run a carb through the TBI pump with a mechanical fuel pump on the motor. In this case, the in-tank pump would just sit in place with the relay removed. Additionally, you can use a fuel pressure regulator to knock down the pressure for carb conversions to TBI cars.
It is important to note that the 3-line fuel pump setup was originally designed to help keep the fuel supply cooler, reduce knocking, and minimize boiling of fuel during stop-and-go driving. However, with a 2-line setup, you may experience higher pressure, especially with injected applications, which a mechanical pump might not be able to handle. In such cases, you can either use an in-tank pump and regulate the pressure down or pull the pump/sender and install an earlier sender without a pump for a carbureted application.
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Removing the in-tank pump and setting up a tank for a 2-line system
First, jack up the car and put it on stands. Drain the fuel, remove the exhaust heat shield, and move the hand brake cables. Remove the bolts, the rubber filler pipe hose, the pipes, and unplug the cables. Pull the tank out enough to access and remove the fuel pump.
Once the tank is accessible, remove the wiring clips and pipe clips, and completely remove the filler hose. Place a drainage container under the bottom hose coupling. Remove all bolts and ease the tank towards the filler end, being careful not to kink any pipes. Lower the tank and remove the wiring connector and the two fuel pipes. Then, unscrew the plastic collar that holds the fuel pump in place. This is usually done anti-clockwise, and a long screwdriver can help to lever the collar.
At this point, the tank is ready for a new 2-line fuel pump to be installed. However, it is important to note that simply capping the return line back to the tank will work, but a fuel return pump on the engine is preferable.
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The benefits of a 2-line fuel pump over a 3-line one
Installing a two-line fuel pump is a straightforward process that offers several benefits over a three-line fuel pump.
Firstly, two-line fuel pumps are generally easier to install, especially in vehicles with two-cylinder engines. These engines feature bosses and a pulse port in the block, allowing for direct bolt-on installation of the two-line fuel pump. In contrast, three-cylinder engines often lack the pump mounting cast, requiring a three-port pump and an additional hose for the pulse port.
Secondly, two-line fuel pumps eliminate the need for complex modifications, especially when converting from a three-line system. By capping the return line back to the tank, a two-line fuel pump can be utilised effectively. This simplicity reduces installation time and potential complications.
Additionally, two-line fuel pumps are known to perform adequately in properly tuned engines, negating the need for a more complex three-line system. This simplicity can enhance reliability and reduce potential points of failure.
While both two-line and three-line fuel pumps have their applications, the two-line variant offers ease of installation, simplicity, and adequate performance in most cases. It is important to note that the choice between the two ultimately depends on specific engine configurations and requirements.
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How to use a 2-line fuel pump with a 3-line car
Installing a 2-line fuel pump involves connecting the pump to the intake manifold and the pulse port. The process typically includes steps for fuel input, pulse limiter hose, fuel output, and crankshaft suction.
To use a 2-line fuel pump with a 3-line car, you can follow these steps:
Firstly, understand that the 2-line and 3-line fuel pumps work similarly, with the key difference being the way the pump gets its pulses. The 2-line pump mounts directly to the intake manifold and the pulse port, while the 3-line pump uses a remote pulse source via a hose.
If your 3-line car has a capped-off pulse port and threaded bosses, you can use the 2-line pump by simply bolting it onto the engine block. Ensure that the pulse port is plugged or capped to prevent any issues.
Additionally, you can keep the in-tank pump of the 3-line car in place while adding the 2-line pump to the engine. This may not require any modifications to the in-tank pump, and you can simply remove the relay.
Finally, you can cap the return line back to the tank when using a 2-line pump in a 3-line car. However, it is recommended to use a fuel return pump on the engine for better performance and to avoid issues like percolation and vapor lock.
Remember to consult a professional or a mechanic if you are unsure about any steps or modifications.
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Frequently asked questions
The 2-line fuel pump has two pressure lines out of the pump: one to the carb and a smaller one back to the tank. The 3-line fuel pump has an additional line to pull exhaust fumes from the tank to the charcoal canister, where the fumes are then pulled to the engine to be burned.
You can cap the return line back to the tank, but a fuel return pump on the engine will be more beneficial.
For a 2-cylinder engine, you just bolt it on and go.
