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FUEL SYSTEM DIAGNOSTIC ARTICLES AND PROCEDURES

The information in the following articles and diagnostic procedures is a result of about 20 years of designing, building and working on 7.3L and 6.0L fuel systems. It comes from taking many tech support calls and figuring out many problems over those years. The articles are organized below in the order we recommend following for each type of problem listed. Please review them in order if you are trying to figure out a problem as there is nothing more frustrating than realizing that you skipped the most basic of checks that would have found your problem because you assumed it would be something else.

These articles were written for customers with our Driven Diesel line of fuel system products, but they are general enough in nature to apply to just about any 7.3L or 6.0L fuel system. If you are using these links to solve problems with a competitors fuel system product, because you called them and they couldn't help you diagnose it, we are glad we could help and hope that you remember us for any future diesel needs.

If you work for a competitor, and you are reading these aticles so you can finally understand what you are selling, you should have figured it out before you copied other peoples work and sold it as your own.

The BOLD headings are "Problem Types". Go to the "problem type" that matches your situation and start from there:

LOW FUEL PRESSURE (most common complaint):

Article 1 - Fuel Pressure Regulator Basics

Article 2 - Fuel Pump Voltage Checks

Article 4 - Final Regulator Check & FASS/AirDog Issues

Article 5 - Diagnosing Suction Side Flow Problems

Article 10 - OBS Selector Valve Issues

FUEL SYSTEM LEAKS:

Article 6 - Common Pressure Side Leaks and How To Fix Them

FUEL PRESSURE TOO HIGH (rare):

Article 7 - Diagnosing Higher Than Desired Fuel Pressure

TRUCK WILL NOT START / LOW ON POWER:

Article 3 - Is My Fuel System Causing My "No Start" or "Lack of Power"

DRIVEN DIESEL FUEL PUMP HARNESS DIAGNOSTICS:

Article 8 - Diagnosing Driven Diesel "OBS" Fuel Pump Wiring Harness Problems

Article 9 - Diagnosing Drivin Diesel "Universal" Fuel Pump Wiring Harness Problems

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