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I have a Bambi 75/250 compressor that’s worked perfectly for many years I lent it to a friend when he returned it and the compressor was laying on its side in the back of his truck he said it was working fine.

Now I have just gone to use it and its not making any pressure. I have checked the air adjustment valves still nothing could laying on it side be the problem as it is oil filled?

Help would be much appreciated,. My thanks, MickP.


Mick, oh my, that’s not good. I do believe that oil lubed compressors in particular are meant to operate vertically, that is, with the sump at the bottom.

The oil sump of any compressor will, in time, have crud drop out of suspension and drop to the bottom of the sump. The amount and thickness may vary depending on how long the compressor has been in use. By turning your Bambi 75/250 compressor on it’s side, your friend may have caused some of that oil and crud to percolate into areas on the compressor where it shouldn’t be. Kind of like turning a car upside down. Oil and debris gets where it shouldn’t go.

That it’s running is good. But it’s not making any air at all?  How long have you run it without success in building air?


Doug from s.d.ca asks, how long has the compressor been upright after you took it out of the truck and before you started it. The issue may clear itself in time, perhaps. Also, are you sure the tank drain valve is closed? And, does it sound normal when it’s running?


Mick, I think that after a day or so of sitting upright, if it runs and there is not air built, first pull the pump-to-tank tube off the top of the piston head. Run the compressor. Any air out at all?

If there is some air, it could be that the tank check valve is fouled shut and stopping air from entering the tank, not likely, but possibly.

I think you’ll find that there is no air coming out of the pump head, and if that’s the case, I’m afraid it’s time to pop the top off and have a look. Valves may fouled, etc.

What did you find if you opened up the pump?