* Increased Fuel Pressure: External pumps can provide higher fuel pressure than in-tank pumps, which is necessary for some performance modifications and larger injectors.
* Improved Fuel Delivery: External pumps can deliver fuel more consistently and efficiently, especially at high flow rates demanded by high-performance engines. In-tank pumps can struggle to keep up under these conditions.
* Reliability: An external pump can be easier to maintain and replace than an in-tank pump, which requires dropping the fuel tank.
* Flexibility: They allow for more precise fuel pressure regulation and easier integration of fuel system upgrades.
* Safety: In some cases, placing the pump outside the tank reduces the risk of fire in the event of a fuel system failure.
However, using an external fuel pump requires careful consideration:
* Proper Pressure Regulation: You'll need a fuel pressure regulator to maintain the correct fuel pressure at the injectors. Too much pressure can damage the injectors, and too little can lead to poor performance.
* Fuel Line Routing: Properly routing the fuel lines is crucial to prevent leaks and ensure adequate fuel flow.
* Pump Selection: Choosing the right pump with the correct flow rate and pressure is essential for your specific application.
In short, while it's possible and often beneficial, using an external fuel pump is more complex than relying on an in-tank pump. It requires careful planning, installation, and potentially a fuel pressure gauge for monitoring.
