DeatschWerks DW400 Pump Module for 12-15 Civic Si & ILX

DeatschWerks DW400 Fuel Pump Module - 12-15 Honda Civic Si / 13-15 Acura ILX 2.4L (K24Z7)

The K24Z7 in your 9th-gen Si or ILX makes good torque, and a turbo or supercharger makes the most of it. The fuel system is where it hits a wall. From the factory, it's returnless. The regulator sits in the tank module, and one line runs up to the rail at a fixed pressure. That pressure can't change with boost. Once you're in boost, the pressure inside the intake manifold pushes back against the injectors, so each pulse delivers a little less fuel than the tune expects. Add a factory pump sized for N/A power, and a boosted K24 can run out of fuel at the top of third gear before you even see it on a gauge.

The DW400 module drops in where the factory module was and switches the car to a return-style system. A new -6AN line feeds the engine, and the factory feed line becomes the return. That lets you put a regulator in the engine bay, referenced to boost, so fuel pressure rises with boost and the injectors keep flowing what the tune calls for. DeatschWerks rates it for 900 hp on gasoline and 700 hp on E85. No K24Z7 build needs that much, but it means the fuel system is one thing you won't have to redo when the turbo gets bigger.

What It Keeps from the Factory Module

It plugs into your factory harness, so there's no wiring to cut. It keeps the fuel level sender, so your gauge still reads right. It also keeps the surge bucket, which is the reservoir around the pump inlet that keeps fuel at the pickup when the tank's low and the car's loaded up in a corner. Hoses, clamps, filters, and electrical connectors are all in the box. It's rated for pump gas, race fuel, and E85.

Choosing a Return Kit

You can get the module by itself or bundled with a return plumbing kit. One kit uses CPE fuel hose, a synthetic rubber made to handle gasoline and ethanol. It's the less expensive way to plumb the return. The other uses PTFE-lined hose with push-to-fit connections. PTFE doesn't react with fuel at all, so it won't break down in ethanol, and it lets almost no fuel vapor through the hose wall. That means no fuel smell in the garage. Running E85 full time? The PTFE kit is the better long-term pick.

Install Notes

Run the tank low and relieve fuel pressure before you pull the module. It's under the rear seat. Swap in a new module-to-tank seal if the old one has gone flat or hard. Route the -6AN feed line clear of exhaust heat and suspension movement, and clip it securely along the body. Check for leaks with the key on and the pump running, before you crank the engine. Check the voltage at the pump with the engine running, too. If it's noticeably below battery voltage, a dedicated relay and new wiring will get you the full flow you paid for. The car needs a tune for the new fuel pressure before it sees boost.

Fitment

• 2012-2015 Honda Civic Si - K24Z7
• 2013-2015 Acura ILX 2.4L - K24Z7
• Does not fit the 2012-2015 Civic non-Si or the ILX 1.5L Hybrid or 2.0L
• Converts to a return-style fuel system: -6AN feed, factory feed line reused as return