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I was driving my 03 duramax down the expressway when I slowed to leave the oil pressure went to almost 0 I stopped and found that the diesel fuel had filled my oil pan. Is this due to injector at injector pump?
 

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Welcome to DieselPlace
Is your LB7 stock or do you have any modifications?

The LB7 Injectors are known for lots of issues:
 

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IDK...... Bosch only I think or USA Canada.
Mexico China giant trash pile.
Never a good part yet.
 

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Might be a cracked injector body or return line leak under the valve cover.Could be a cp3 problem but usually injectors or a leak on the return side under the valve cover is the culprit.
 
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