LARGE FUEL LEAK

Hello Diesel World,

I have a 2001 Silverado with 92,910 miles on it. Recently, I had a reduction of power (limp mode), so I had someone check trouble codes. The code is a P0093 Large Fuel leak .... The truck is completely stock. I have owned it since it was New.

I checked the oil and it smells Ok and is not above full. I do not suspect it being injectors. Knock on wood - I have not had any problems with them yet. Can you share with me what I should try or evaluate next. I have looked and smelled for fuel leaks. Fuel filter was changed 4,200 miles ago. Any assistance would be appreciated.

Regards Scott Gyr Via Email Hi Scott,

The P0093 trouble code is set when the difference between the actual & commanded fuel rail-pressure exceeds 20MPA. The GM service test procedure winds its way through the various possibilities for a low rail pressure, such as a high fuel return rates due to faulty injectors or leaking fuel-return lines, or a leaking fuel-rail pressure relief valve. The list of possibilities could also reside with either the FRP (Fuel Rail Pressure) regulator or high-pressure fuel injection pump.

Once the cheap and easy items are eliminated (like the fuel filter change or fuel line leaks), you may need to consider the most often discovered cause - injectors.