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04-15-2008, 13:15
2001-2004 Duramax Diesel
Excessive Fuel Return Flow & Related DTCs
P0089 - P0093 - P1093
The Diagnostic Trouble Code P0093 applies to the 2001 model-year Duramax. This trouble code was updated for the 2002-2004 model year engines, and received a new number - P1093. Each refers to the same problem. P0093 & P1093 are defined as "Fuel System Large Leak Detected", which could mean that one or more injectors are experiencing a high fuel-return flow rate. People usually start looking beneath the truck for signs of fuel, but this isn't that kind of a leak. Let's have a look at these, and other related trouble codes, to provide a little more insight into what they mean and how to deal with them.



1990's 6.5L Diesel Market Share
And a look to the future.

This article is both a look back to the introduction of the 6.5, with an analysis of the 1988-1998 GM/Ford/Dodge market share, and a look forward to what should mean a bright future for the 6.5L Turbo Diesel.



6.5L Diesel
Low Fuel Supply Pressure Due to Excessive Fuel Return Flow

Not many "new" 6.5L diesel problems come to light these days. After twelve years, we've seen just about every problem these engines and fuel systems can experience. A few months ago one of our Hawaiian members called to report a problem he was having with his DS4 equipped 6.5 that I had not dealt with before, and I thought it was interesting enough to discuss here in The Diesel Page. That problem is excessive fuel return flow and low fuel pressure developed by the electric fuel lift pump.

These articles are available now to subscribers in the Member's Area (http://www.thedieselpage.com/password.htm).