Fuel Pump Diagnostics Archives - UnderhoodService
Understanding Engine Misfire Codes

When the fuel/air mixture ignites, many factors must be met to pass a misfire monitor.

Today’s Fuel Pressure Diagnostics

Direct injection pressure is measured with sensors, and you’ll need a scan tool to measure the signals

Acura High-Pressure Fuel Pump 

Follow the correct repair procedures for a high-pressure fuel pump that is making a chirp.

Ethanol & Fuel Systems

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

High-Pressure GDI Fuel Pumps

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

Fuel Pump Circuit Resistance (VIDEO)

A melted connector is a sign there is too much resistance that should not be present. Sponsored by Carter.

VIDEO: Real Fuel Pump Diagnostics For Pros

The reality is that for technicians working on a car this almost never works. This video is sponsored by Carter.

VIDEO: Fuel Pump Level Sender Operation

How do modern gas gauges stay still when the gas in your tank moves around? This video is sponsored by Carter.

Driveability Diagnostics And Direct Injection

Direct injection can be a diagnostic challenge, but with the right foundation, problems can be solved profitably.

Fuel Pump Codes And Control: Keeping Pressure In The Zone

Since the fuel pump module needs information for various sensors, it usually communicates on a serial data bus. If modules are not communicating, the fuel pump can’t be adequately controlled. The key to investigating these problems is to communicate with different modules to see what data PIDs are present and which ones are missing.