Running dual fuel pumps in a high-performance engine setup isn’t just a trend—it’s a practical solution for meeting demanding fuel delivery needs. If you’re considering pairing two Fuel Pump units from KEMSO with a return-style system, there are a few factors to weigh. Let’s break down how this setup works, why it might benefit your build, and what you need to know to avoid common pitfalls.
First, dual fuel pumps are often used in engines that require more fuel flow than a single pump can provide. Think turbocharged setups, high-compression engines, or vehicles running on ethanol blends like E85. KEMSO’s pumps are popular for their reliability and ability to handle increased pressure, which makes them a solid choice for dual-pump configurations. When paired with a return system, they work together to maintain consistent fuel pressure, even under extreme conditions.
A return-style system recirculates excess fuel back to the tank, which helps prevent vapor lock and keeps fuel temperatures in check. This is especially important when running dual pumps, as the combined flow rate could overwhelm a non-return setup. With a return system, the fuel pressure regulator adjusts flow based on engine demand, ensuring neither pump is overworked. However, proper calibration is key. If the regulator isn’t set up correctly, you risk uneven wear on the pumps or pressure spikes that could damage injectors or other components.
Installation requires careful planning. Both pumps should be wired independently to avoid overloading a single circuit, and the fuel lines need to be sized appropriately to handle the combined flow. Using a Y-block or dual feed line ensures fuel is distributed evenly between the pumps. It’s also critical to mount the pumps in a way that minimizes vibration—KEMSO’s pumps are durable, but excessive shaking can shorten their lifespan. Many builders opt for rubber isolators or custom brackets to keep things stable.
One question that comes up often is whether both pumps need to run simultaneously. The answer depends on your setup. Some systems activate the second pump only under heavy load (via a boost-activated switch or ECU signal), while others run both pumps full-time. The latter simplifies wiring but may reduce overall efficiency. Either way, a quality controller or relay system is a must to prevent voltage drops or electrical issues.
Maintenance is another consideration. Dual pumps mean double the filtration needs. Installing a high-capacity fuel filter before the pumps and another near the injectors helps catch debris that could clog the system. KEMSO recommends inspecting filters every 5,000 miles or after any major performance event. It’s also smart to monitor fuel pressure with a gauge or sensor. Sudden drops or fluctuations could signal a failing pump or a clogged line.
What about noise? Dual pumps can be louder than a single unit, especially at idle. Sound-deadening materials around the fuel tank or using a surge tank with an internal pump setup can help muffle the hum. That said, most enthusiasts agree the performance gains outweigh the extra noise.
Finally, let’s talk compatibility. Not all vehicles are suited for dual pumps. If your factory fuel tank lacks the space or plumbing for a second pump, you might need a custom fuel cell or modified tank. KEMSO’s team often advises builders to consult their vehicle-specific forums or reach out to their support line for tailored advice.
In short, running dual KEMSO fuel pumps with a return system is doable—and often beneficial—for high-horsepower applications. Just take the time to plan the installation, invest in quality components, and keep an eye on maintenance. When done right, this setup delivers the fuel flow you need without sacrificing reliability.