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oil tanks not drawing properly
I have a customer with two 250 gallon oil tanks in their basement, they supply oil to one 200 mbh boiler.One pipe system with no return to the tanks. The supply from the tanks are manifolded together then run over to the boiler. The tank's vents are manifolded together then run outside the home through one pipe. Each tank has their own fill line, that runs outside. The issue is is that the tanks never seem to draw down at the same rate. The one that is closest to the burner always seems to get to 1/4 full before any oil is drawn down from the other tank. Both tank floats were replaced last year, and I checked them today to make sure they were still in working order. The tanks are located side by side, and both are level front to back. Like I had mentioned the other tank will eventually drawn down, however I would think that the way they are piped with one common line to the boiler that they would both drawn down at the same rate. Any ideas or suggestions as to why this is happening would be much appreciated. thanks to all.