Fuel System Archives - UnderhoodService
Fuel Trims

To gain a better perspective on fuel trims, think about how “analog” vehicles dealt with changing fuel and air mixtures.

Ethanol & Fuel Systems

Here’s what you need to know about ethanol and E15 fuels.

Fuel Pressure Diagnostic Service

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

GDI System Overview & Common Failures (Video)

GDI Systems are changing with fuel economy standards and emissions regulations. Sponsored by Standard Motor Products.

GM Active Fuel Management System Service

The AFM activation and deactivation are controlled by the Valve Lifter Oil Manifold or VLOM.

Why Does A Fuel Pump Have Springs? (VIDEO)

Make sure the springs and guide rods are not damaged when the new unit is lowered into the tank. Sponsored by Carter.

Delphi Technologies Fuel Systems to Power Your Business

The Delphi Technologies Difference.We start with the OE design and conduct extensive dimensional and material analysis to develop our part that will perform reliably on any vehicle. We’re passionate about our stringent technical standards—it’s in our DNA. Integrated OE expertise Delphi Technologies applies its 80+ years of OE expertise and pioneering technology to every fuel

Unique Mobile App To Test For Fuel Contamination

On-site fuel testing for microbial contamination is easier, more accurate than ever.

Lucas Oil Deep Clean Fuel System Cleaner

Developed by Lucas Oil Products, Deep Clean Fuel System Cleaner contains additives to improve fuel economy, reduce exhaust emissions and increase power.

Fuel Pumps And Voltage Drop – Still A Valid Test

Voltage drop testing compares the battery or charging voltage to the voltage at the component.

Pulling Codes: Multiple Misfire Personalities

The vehicle appeared to run fairly well at idle, but when taken for a test drive, did not perform well. We crack the code.

VIDEO: Clean The Fuel Tank Before Replacing The Pump

Sediment, rust and debris from the pump can get into the tank and kill the fuel pump. This video is sponsored by Carter.