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Suzuki Sequential Fuel Injection

By 17th Sep 2020Technical Advice

The Digital Revolution increasingly dominated the 1990’s and Suzuki Marine stepped forward as the marine industry’s technological leader with Digital EFI.

Though Digital EFI can be found in almost every automobile on the road, in the marine outboard industry, Suzuki is the only manufacturer to offer a full line of digitally-controlled EFI Four Stroke engines, from the DF40 through DF300. Only through years of experience with Digital EFI systems in its automobiles and motorcycles has Suzuki been able to bring this technology to the marine outboard market.

Considering the rapid rate in which digital technology continues to permeate our society, it is only logical that Digital EFI will eventually become the system of choice for outboard motors as well. The Suzuki line of EFI Four Stroke outboards contain what will become the industry-wide norm.

Suzuki’s state-of-the-art digital electronics technology, featured in each of these motors, monitors changing conditions on the water and in the motor, and maintains continuous access to a pre-programmed information “map.” The Digital EFI system then responds instantly to any changes in throttle setting, atmospheric pressure, cylinder wall temperature, exhaust manifold temperature, air temperature and engine speed by adjusting the air/fuel mixture according to this map.

The four-strokes have incorporated a sequential multi-point fuel injection system. Fuel is delivered to the engine through four (six on V-6 engines) high-pressure injectors. These injectors have a delivery timing that is directly related to the ignition timing and crankshaft positioning. Fuel is released at each injector at separate times in conjunction with each revolution of the crankshaft. The result of all this high technology is an outboard motor that starts instantly in all weather conditions, runs cleaner and has a quicker and crisper throttle response under all types of loads.

Predictably, Suzuki’s Digital EFI system accomplishes this much more accurately than analog-based injection systems. Analog systems – archaic by today’s standards – must rely on “average” settings that lack the precision of digital-based controls when operating under the wide variety of conditions outboard motors face every day.


There seems to be little doubt that the digital revolution is upon us, and that rather than fading away, its technological advantages will carry us into the next century and beyond. Analog communication is becoming obsolete on all but the most basic levels, as can be seen with the latest developments in consumer electronics, personal computers, telecommunications, automobiles and countless other industries.

This holds true for the marine market as well. Currently Suzuki Marine enjoys its place as the technological leader among outboard manufacturers, and can always lay claim as the innovator of the Digital EFI system which will likely become a standard feature of outboard motors in the future. As of the printing date of this guide, two other outboard manufacturers have entered the Digital Age – using a system similar to one that has been marketed by Suzuki Marine since 1990.

Courtesy Suzuki Marine USA

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