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You want the return to be as far from the intake as possible and at the bottom of the tank to avoid aeration of the diesel fuel. Diesel will hold a significant amount of air if it's bubbled / shaken up..
Thanks. My J300's fuel tank doesn't have a proper return line. Any reason why I can't tap into the fuel inlet line near the tank and have the returned fuel dump into the inlet isolated from ambient air?
 

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If you're talking about doing a T into the line coming out of the tank and going to the engine.. Remember that the fuel does 2 jobs in the IP: Lube and cooling. However you do it, you probably want to cycle the fuel through the tank to avoid potential overheating. Plus, the return fuel is somewhat aerated to start with, so it needs to be able to "settle" a bit.
I think I'll graft a return line downpipe into my original fuel level sender/pick-up assembly. Thanks.
 
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