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oil line sizing

fwb1375
fwb1375 Member Posts: 7
I have two oil burners in a basement. The oil line is teed off before the units (3/8)

into two differnt oil ffilters, and then into units. The feed is off of the bottom of the tank,and then runs along the floor about 30 feet away. The units work fine until both run at the same time. I put a pressure guage on one of the two units. When just the one unit runs, i am at 100psi. With that unit running and the other kicking on at the same time, the pressure drops until it snuffs the flame out. My thinking is that if i run new oil lines into the top of tank, and increase to 1/2" and bring to both units that i will eliminate the problem. I am thinking that i may have alot of sludge in bottom of the tank. I was planning to run one 1/2" OD copper line into the top of the tank,and overhead which is 7 feet high with a developed length of 43 feet and then tie in before tee to both units. Doe anyone think this would be a problem?      Any input would be great.

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