Fuel injection cleaning and testing - Jebs Performance Engineering

Every tech learns early on that an engine needs three things to run: It has to have sufficient compression from the engine itself, a strong spark from the ignition system and the proper fuel charge from the fuel system.

And it all has to happen at the right time. A discrepancy in any of these areas will lead to driveability complaints, higher emissions levels and lower fuel economy.

THE FUEL SYSTEM´S JOB

To diagnose any system, you must understand what that system is supposed to do. At its most basic level, the role of the fuel system is to deliver a clean, constant supply of fuel in the correct amount needed by the engine under all conditions, We can break this down further into two separate functions: fuel delivery and fuel control.

Fuel delivery is the job of the fuel pump and its related components. Basic fuel delivery tests should be a part of any driveability diagnosis, so let´s start there.

The most common test of a fuel delivery system is the fuel pressure test. Connect your fuel pressure gauge at the supplied test port or using the appropriate adaptors in your test kit. Most specifications for tirol pressure are taken with the key on and engine not running, and most systems will shut the fuel pump circuit off after a few seconds if no crankshaft position (CKP) signal is received. Therefore, you will have to command the fuel pump on with your scan tool, or cycle the key on and off until you have reached a maximum reading. You may have to bleed the air out of your tool, so consult the tool´s instructions as well.

Read the full article "Basic fuel injection diagnosis: here are a few tips on isolating fuel system-related complaints." by Peter F Maeier.

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