DW65c vs DW300c Fuel Pump for 2006-2015 Honda Civic
By PRL Motorsports - Premium Automotive Performance Products | Published: 2026-11-01
Category: Comparisons
Compare the DeatschWerks DW65c 265 LPH and DW300c 340 LPH in-tank fuel pumps for 2006-2015 Honda Civic Si. See flow differences, fitment, and which suits your build.
Quick answer
For most 2006-2015 Civic Si builds with bolt-on or mild turbo upgrades, the DeatschWerks DW65c 265 LPH is the practical choice: it supports the stock fuel line and installs cleanly. Choose the DW300c 340 LPH only if your setup needs more flow and you are prepared to verify fuel system compatibility beyond the pump itself.
Flow rate difference: 265 LPH vs 340 LPH
The DW65c is rated at 265 liters per hour, while the DW300c is rated at 340 LPH. That 75 LPH gap matters only when your engine actually demands it—typically at higher power levels or with ethanol blends that require more volume. For a stock or lightly modified Civic Si, the 265 LPH pump already provides headroom over the factory unit, so the extra capacity of the DW300c often goes unused.
If you are planning a turbo upgrade or E85 conversion, the 340 LPH pump gives you more margin before you need to step up to a larger in-tank or external setup. But flow rating alone doesn't guarantee compatibility with your fuel lines, injectors, or tune—those parts must be sized to match.
Installation and stock fuel line compatibility
Both pumps are designed as direct-fit bolt-in units for modern Honda and Acura applications, and both work with the stock fuel line—unlike some Walbro pumps that require replacing the factory line with a new rubber hose. That shared design simplifies installation and reduces the chance of leaks from improvised connections.
The DW65c and DW300c both fit all 2006-2012 and 2012-2015 Civic Si models, including RHD and international variants. However, neither listing provides detailed dimensions or electrical connector specs, so if you have an unusual trim or a modified fuel hanger, verify physical fitment before ordering.
When the DW300c is worth the extra cost
The DW300c costs more than the DW65c, and that premium buys you additional flow capacity. If your build plan includes forced induction, a high-revving naturally aspirated setup, or flex-fuel, the 340 LPH pump can delay the need for a fuel system overhaul. But if you are years away from those mods, the DW65c leaves more budget for other supporting parts.
Keep in mind that a higher-flow pump can overwhelm a stock fuel pressure regulator or return system if not properly tuned. Neither product listing includes a fuel pressure regulator or tuning requirements, so factor in the cost of a proper tune and any necessary supporting hardware when comparing total expense.
Key trade-offs
- Flow capacity vs. cost: The DW300c flows 340 LPH versus 265 LPH for the DW65c, but costs more. Choose the DW65c if your power goals are modest; choose the DW300c if you need the extra volume for a planned turbo or E85 build. Match pump flow to your actual fuel demand, not to a future maybe.
- Installation simplicity: Both pumps are direct bolt-in units that work with the stock fuel line. Neither requires the line replacement needed with some Walbro pumps, so installation effort is similar. If you want the simplest install, either pump is a good fit—focus on flow needs instead.
- Fitment coverage: Both pumps fit all 2006-2012 and 2012-2015 Civic Si models, including RHD and international variants. No dimensional or connector specs are supplied, so verify physical fitment for highly modified fuel systems. Check your specific model year and any fuel hanger modifications before ordering.
Product facts
- DeatschWerks 2006-2015 Honda Civic DW65c 265 LPH Compact In-Tank Fuel Pump: 265 LPH compact in-tank fuel pump designed as a direct fit for 2006-2015 Civic Si, including RHD and international models. It supports stock fuel line compatibility and fits a wide range of Civic Si variants without adapter hassles.
DeatschWerks 2006-2015 Honda Civic DW65c 265 LPH Compact In-Tank Fuel Pump - DeatschWerks 2006-2015 Honda Civic DW300c 340 LPH Compact In-Tank Fuel Pump: 340 LPH compact in-tank fuel pump, also a direct fit for 2006-2015 Civic Si, including RHD and international models. It offers more flow headroom for higher-power builds while retaining the same bolt-in installation and stock fuel line compatibility.
DeatschWerks 2006-2015 Honda Civic DW300c 340 LPH Compact In-Tank Fuel Pump
Which pump is right for you?
Best for
- Stock or lightly modified 2006-2015 Civic Si with bolt-on intake, exhaust, or tune
- Owners who want a direct-fit upgrade with stock fuel line compatibility and lower cost
Not for
- Builds planning a turbocharger or E85 conversion that require higher fuel flow
- Owners who already know they need 340 LPH or more for their power target
