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Might have a relay stuck closed. I would suggest changing the fuel pump relay and if that doesn't solve it, look for a short somewhere in the wiring. Somehow you are getting voltage when you are not supposed to be.
There are several reasons, for example; the hum could be a relay or valve. It could be a frozen pump, meaning the parts that spin are stuck in place and need to be feed up, if possible. It could be a belt that slips when the pump shaft sits idle. The only way to get the problem fixed is to have a professional check out the problem and do repairs.
See if the A/B switch makes any difference in the feed dogs.
Sometimes these old machines haven't been oiled like they should and it's possible the feed dogs are stuck in the lowered position. Also, if it was used a lot the feed dogs get worn and no longer work like they should.
ONLY TO THE FOLLOWING IN AN OPEN AREA AWAY FROM FLAMES/FIRE/IGNITION SOURCES.
To answer your question if the gas regulator can get stuck...the answer is YES.
Check to make sure gas is getting thru the regulator...to do this disconnect the hose going to the burner controls...turn on the gas at the tank and listen and smell for gas coming out...if there is no gas coming out, you can sometimes tap lightly the gas regulator and it will free the sticking valve inside and let the gas flow...if the tapping does not work, the replace your regulator as it is faulty.
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Since the machine hadn't been used in a while you might have a stuck check valve in the pump. You say it hums. Does it rattle or just hum? If it hums something is stuck in the lines that is keeping the pump from moving water. If it rattles and makes a lot of noise its the pump check valve or it could be a plugged flow meter/ intake line.
dirt , foriegn material,spider web in gas feed line to the right side ceramic element of mr heater big buddy. take plastic back of heater off, many #1 philips or smaller screws. find large air induction holes in gas feed line to right side ceramic element and blow out with compressed air and fine tiped /straw tipped air blow gun. straw tipped air blow gun is a better tool for this. reassemble & try lit mr heater again. If it dont work after air blow gun the gas feed tube, you didnt get the gas feed tube cleaned out ,***** & span (something still in there ) and will need to disassemble the gas feed tube and inspect for foreign material blocking the gas flow.
If this dont work,need to take the gas feed line off the gas valve attached to Mr. heater red knob. red knob just pulls straight out, might need pliers to grab red knob. check gas valve output for dirt etc that stop gas from getting through. check inside the gas line to the ceramic burner for dirt, foriegn material- that stop gas from flowing through strong.
any stopage of gas flow , even a slight stopage or dirverting of the gas flow, spider web is common, will stop ceramic element from burning properly.
Check to see if it still allows water to flow from either the hot or cold side; change the temperature setting to do this. You don't need to have the water line valves wide open for this.
If it only feeds from one or the other, the flow control valve located where the water lines connect may be stuck and needs to be replaced. This valve is behind the hose connectors.
This is not a difficult task and requires only a few tools and some common sense.
Check to see what pattern is selected. Be sure it isn't the buttonhole.Select straight stitch.Move the stitch length setting to 4.Turn the handwheel and see if the feed dogs move forward. Press the reverse lever and see if they move backwards. Select straight stretch stitch and turn the wheel to see if the feed dogs move forward and backward.Check the presser foot release on top of the machine and make sure there is pressure on the foot. Sometimes the reverse assembly on this machine stops working because it has the wrong type of grease on it and it turns into a hard gummy mess that won't let it work. sewman7