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Problem with Oil Fired swimming pool heater
We have an unusual oil fired swimming pool installation. 550g oil tank is buried on side of house, new single oil line was buried and run 200' to new pool heater and up a hill next to pool. Vertical height above tank is at least 24'. Contractor put Sundstrand B pump on Beckett Burner and Sid Harvey oil de-aerator. When mechanic uses push pull pump and burner starts, we read 17" vacuum on filter. When pool heater shuts down, we have a check valve at the base of the pool heater, but none at 40yr old buried oil tank. So now the oil drains back down to the tank and on next call for heated water, oil pump goes out on lock out.
Oil company only has 150' hose so relocating tank, even if homeowner lets him- is not an option. Originally Teledyne pool heater was no problem until 2 years ago which was the same time NYS started using ultra-low sulfur oil. New unit is ThermoDynamics OTF1600 2.5gph firing rate.
Does anyone have any suggestions?