Craftsman compressor tank leaking at reducer - model #919 165120

sears .com ---

NO. If your tank leaks from pinholes you could try and braze the closed

look for a small leak around the welded seams on the tank as well as all the welds on fittings. When there is air in the tank, shoot some soapy water on it like you were looking for a leak in a tire to find small leaks.

If the unit does not unload properly the motor will have difficulty starting. Make sure that the intank check valve is not leaking air back out of tank (with pressure in tank, remove hose from compressor at tank checkvalve and spray soapy water). Replace as needed if leaking or try to repair. If the valve is not leaking then issue my be unloader valve at the pressure switch. Follow small airline from checkvalve to pressure switch. Small valve stem at the pressure switch should release air in line when pressure switch cuts off. Listen for small amount of air to be released when unit shuts off, if air continues to leak out, then check valve is leaking. Replace with generic parts making sure of fitting size. Good luck

Usually related to the in-tank check valve. Follow the discharge hose from the pump to the tank. At the tank the hose attaches to a brass valve (or metal valve). This brass fitting is the check valve. It's purpose is to hold air in the tank and not allow the air to load the compressor when motor is trying to start. Easy to test. Use another compressor to pump air into your tank thru the quick disconnect or remove the safety valve and install hose there. Pump in about 75 psi and looks for leaks with soapy water. Remove air inlet hose from check valve and check for air leaks. If leaking, replace with generic valve available at www.grainger.com or order from sears parts. If no leaks then suspect unloader is not working at the pressure switch. If both the unloader and check valve is ok then test capacitor for reading within 95% of rated valve. Good holidays

Leaking in-tank check valve will cause air to continually leak out of unloader valve at pressure switch. Remove brass/steel fitting at tank and check seat for debris or replace as needed. You can use generic valve just watch fitting sizes. Available at www.grainger.com. Good luck

what did you do when you first started up did you let the air run out for 30 min or let it start full up tank

you have a broken valve. follow the small 1/4 line that comes from the pressure switch, and if it goes to the discharge line from the pump to where it enters the tank, there is a large hex fitting that it is hooked into. drain all the pressure off the tank, and remove the fitting from the tank, this should be a check valve and is stuck open.

If the small line goes to an innerstage cooler between the large and small cylinders, then you have a broken valves in the cylinder head that need to be rebuilt.

This problem is not uncommon with small compressors and the inexpensive plastic regulators they use nowadays. The one surefire way to stop it is ti install in in-line valve before the regulator outlet, even if it involves the double ended & threaded brass soupler so they both fit on. This way you can just turn the handles across the line effectively shutting off air flow. I have two pancake compressors and ended up doing the very thing.

Then when time comes to hook up a hose and tool, just switch the handle back and you have air.

Sirwriter

The needle valve that you see is the unloader which releases air pressure from the discharge line after set pressure is obtained. If air continues to leak after the compressor shuts off, the check valve installed in the tank is leaking air out of the tank. Follow the air discharge line from the compressor to the tank. There you will find a brass valve which is the check valve. Simple test is to remove the smaller airline (1/4") from the brass valve and check for air leaking. If leaking remove brass valve and check for debris under the white seat. If you cannot clean the valve, replace with generic check valve from www.grainger.com. It will cost less than factory part. Just order the valve considering the fitting sizes that you need. For exact replacement,( www.sears.com parts). If you sears model # begins with WL then your compressor is made by campbell hausfeld and parts may be ordered from www.chpower.com. Good Luck with you repair and email if you have more questions.