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Mack 470 etech fuel return


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Gday

The fuel return comes out under number 4 eup. There is a big line going back to the fuel tank, then there is a 1/4” line come from the front head going back down to the bigger return line. 
 

what does this 1/4” line do and is fuel meant to be coming out of it or does it push fuel back up into the head? 
 

thanks 

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