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Old 10-04-2013
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No Return line on Tank

I'm in the process of re-powering from a Volvo MD11c to Yanmar 3GM30f. My fuel tank has no dedicated fuel return fitting, only a fill, air-vent, and fuel supply fitting.

I'm thinking maybe the old Volvo had its return line fed back into the fuel line.

Since I'd rather run a proper return and my tank isn't designed for it, what are my options?

Can I install a t-fitting on the tank and install my return line below the air vent hose?
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Old 10-04-2013
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Re: No Return line on Tank

Or you can return the pipe back to the incomming side of the fuel filter..
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Old 10-04-2013
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Re: No Return line on Tank

Quote:
Can I install a t-fitting on the tank and install my return line below the air vent hose?
I'd think that would be OK as long as the T fitting is big enough that the return fuel flow doesn't interfere with the tank being able to vent.

Teeing into the fill line would leave your vent clear for sure; adding a fitting to the tank is another option, depending on access and how it's made. I'd think the return would run 'happier' free flowing back to the tank rather than back into the feed line and filter(s)
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Old 10-04-2013
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My diesel has a return line to the filter as well as to the tank. I had an air leak in the return to the filter which took forever to diagnose. The easy fix was to block the filter return inlet and tee into the main return line. This also makes it much easier to bleed the system when i do a filter change. Run the line to the tank and don't recirculate.
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Old 10-04-2013
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Re: No Return line on Tank

Why not tap into the filler line?
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