GDI Fuel Pump Pressure Control (VIDEO)

GDI Fuel Pump Pressure Control (VIDEO)

A high-pressure direct injection fuel pump can vary the pressure to the injectors. Sponsored by Carter Fuel Systems.

CC:

A high-pressure direct injection fuel pump can vary the pressure to the injectors from around 300 to 5,000 psi. So, how does it do it? This is the job of this electric solenoid on the side of the unit that controls the pressure and the volume of fuel.

During the inflow sequence of the cycle, the plunger or piston travels downwards. The control solenoid opens, and fuel enters the high-pressure side of the pump. The next part of the sequence is called the “spill” process or cycle. This happens when the piston or plunger starts to travel upwards, the control solenoid remains open for a specific period that is measured in milliseconds. Some of the fuel will spill back into the low side or supply side of the pump. The longer the control solenoid stays open, less pressure will be generated. A shorter open period will create more pressure.

For the system and solenoid to work as intended, the ECM needs to know the position of the camshafts and crankshaft to determine when the control solenoid will open. Why is this important to technicians? Simple. If you are diagnosing a fuel-related “crank/no start” or “limp mode” condition, the ECM must receive accurate information on engine position for the direct-fuel injection system to work. The direct fuel injection system might not work as intended if there are codes for the camshaft or crankshaft position sensors.

This video is sponsored by Carter Fuel Systems.

You May Also Like

Understanding Stretch Shrink Belts

Andrew Markel uses an old school toy to describe how these belts work. This video is sponsored by Auto Value and Bumper to Bumper.

For some of our older viewers, you may remember a toy called Shrinky Dinks. This was a toy where you would color in on a plastic sheet, and then you would cut it out and put it in the oven and it would shrink. So something that was four inches went down to maybe two inches or the size of a key chain. This same technology is involved in stretch belts. If you see a belt that says stretch or stretchy on the side, or it's indicated on the product sleeve that it is a stretch belt. Well, this belt, it typically doesn't have a tensioner with no tension. How does it set that final tension? Well, it uses that same properties as shrink heatings. When the belt is run and gotten up to temperature, it actually conforms to the pulley and grooves to give the proper tension. So what does that mean to you, the technician?

Mass Air Flow Sensor Cleaners

What can you do both for maintenance and for service and diagnostics to confirm a mass airflow sensors functioning properly? Andrew Markel shares the secret in this video sponsored by Auto Value and Bumper to Bumper.

ADAS Calibrations: Limited Space

Babcox Media’s Joe Keene provides a quick overview of many examples that demonstrate ADAS work should be in play for almost everyone.

Growing Service Opportunities: Vacuum Pumps and Parking Brake Actuators

As the car parc evolves, so do service opportunities. This video is sponsored by Standard.

Software Focus: Efficient Diagnostics

Discover how to quickly retrieve codes, access exclusive repair information, and develop a strategic plan for optimal diagnostic results. This video is sponsored by Bosch.

Other Posts

Clutch System Components

By adopting a systematic approach and utilizing quality kits, the longevity and efficiency of the timing system can be maximized, ensuring a smoother-running engine. This video is sponsored by The Group Training Academy.

Timing Components

By adopting a systematic approach and utilizing quality kits, the longevity and efficiency of the timing system can be maximized, ensuring a smoother-running engine. This video is sponsored by The Group Training Academy.

Wheel Bearings Components

Follow along to learn what you may encounter when dealing with a Gen 1 wheel bearing. This video is sponsored by The Group Training Academy.

How EVs Have Changed Wiper Blade Service

For EVs, noisy wiper blades can be an annoyance because there is no internal combustion engine to help cancel out that noise.