fuel injection Archives - UnderhoodService
High-Pressure GDI Fuel Pumps

When solving a fuel pump issue, the scan tool is your best friend.

Fuel Pressure Diagnostic Service

Use a scan tool that can look at special direct fuel injection parameters and perform bidirectional tests.

The Next Evolution Of Fuel Injection

You may soon see a vehicle that has both direct fuel injection and port fuel injection. It could be a Toyota, Ford or other make. It can be confusing because for a long time we were told that direct fuel injection was better than port fuel injection. To get the best power and economy from an engine, some engineers realized that both injection systems could be used on the same engine.

Fuel Injector Circuit Waveforms

The electric fuel injector has been around for more than 50 years. The principles of operation are simple. An electromagnetic coil moves a pintle in a chamber that has pressurized fuel on one side and a nozzle on the other. The coil is typically energized by a driver pulling the circuit to ground. As the coil is saturated by energy, the pintle moves upwards against a spring. This allows fuel to be injected into the engine.

fuel injector circuit voltage featured
Ultimate Underhood: From Mechanical Fuel Injection to Putters

Mechanical constant stream fuel injection is the pinnacle of pure mechanical engineering. The mechanic setting up the system must optimize the amount of fuel for a given throttle position, rpm and engine load. By using different pumps, jets, linkages and metering block settings, it is possible to deliver the correct amount of fuel in large

7 Reasons Direct-Injection High-Pressure Fuel Pumps Fail

Don’t be scared by direct fuel injection diagnostics. In theory, these systems operate on the same principles as port fuel injection, but direct injection can inject more precise amounts of fuel into the combustion chamber so the engine can run leaner and more efficient. The key to direct injection is a high-pressure fuel pump. This

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