Hi, my oil burning furnace (for both baseboard and supply) had run out of fuel 2 days ago, we got a delivery yesterday, so I went to fire it up again. I was told I would only have to bleed the fuel line if the boiler didn't fire, but it went first shot. I'm not a pro on boilers by any means, but I believe I've lost pressure on the expansion tank side (also the line that runs to baseboard heating). This is on a Thermo Dynamics model S-125, ~10yrs old. As soon as it fired back up, the hose nozzle on the same pipe as my T/P RV (about 1" apart on the pipe, 90 degrees difference, valve is at the end of the straight pipe) started releasing all the water going through that side. I can stop the hot water dump by turning off the baseboard/expansion tank side, but that doesn't get me a fully functional boiler. Currently we have full running hot water, and though the heat isn't necessary in the summer, I'd rather not wait to get this working properly again. A few questions here: - Is that nozzle in the rear the release for the valve, or would it come out through the outlet blocked by the valve? - Do I need to drain/repressurize my expansion tank, and if so... how? Any advice is more than welcome, and I can provide pictures or more information for clarity. Thanks in advance.