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I want to install a fuel gauge but selecting a gauge is limited to direct injection. Does anybody know what is the fuel pressure is in the lines and can anybody also tell me if our system is returnless.
 

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The system runs up to and around 200 bar or a little more from memory, usually controlled by a relief valve. A returnless system, never seen one. Where does the excess fuel go?
 

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excess fuel is recirculated to the HPFP. You can monitor fuel pressure via OBD2. Installing a traditional line pressure gauge is not advised nor useful.
 
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