Hello I will help you with your question,
Just to make sure we are talking about the same part look at this diagram. There are no fuel lines that I am aware of to change this valve but it might be possible to install it backwards so check the orientation of the original.
The nut for the lines is a 10 mm nut but that is on the front of the engine I believe
Here is the service information to change the valve
You can try cleaning the valve first, its worth a shot
EGR Valve Cleaning Whenever the EGR valve is removed, or during regularly scheduled EGR system maintenance, the EGR system should be inspected and cleaned. This will insure that the EGR system will function properly under all operating conditions. Proper EGR system service consists of the five steps listed below:Caution: When removing components for cleaning, avoid breathing fumes and swallowing EGR exhaust deposits as bodily injury may result.EGR System Service
The best part of that is to test the pintle for free movement
Look over this information and let me know if you have further questions about this