Aux Fuel Tank Plumbing - Diesel Truck Forum -
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post #1 of 2 (permalink) Old 05-03-2011, 03:29 PM Thread Starter
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Aux Fuel Tank Plumbing

I was sure where to post this but this section looked good.

I just installed a 98 gallon aux tank in my 2011 f350. I think I have a plumbing issue now. The tank has a 35 gph electric fuel pump to transfer into the main tank.

I did some reading and found that many folks have plumbed this into the main tanks vent tube. So I bought a T and connected the aux tank electric pump feed into the vent line.

The first time i tried fill the main tank, the main tank was just over half full. The tank filled to about 3/4 and it stopped filling. So i got home and checked things out and it seems like I am building pressure in the main tank from filling it with the aux tank when im driving. I removed the cap from the main tank and it seems to work well.

Whats the correct way to connect this system so it vents during filling while im driving..
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post #2 of 2 (permalink) Old 05-03-2011, 03:57 PM Thread Starter
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I found a small leak in the supply line to the pump that may have been sucking air, changed that hose and am checking to see if it fills better now..

Im am still concerned that I have a venting problem tho
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