Palax 350 Bar Oil Pump

[Lillywhite Timber]

Hi , theres usually plenty of constructive feedback when i ask a question here . My processor has been flying , generally a great tool . When it comes to bar oil ive been using all sorts , generally brand new regulation bar oil but i will admit ive put some pretty shitty stuff i had in the back of an old container which  had lain untouched for 10 years . 

So the inevitable has now happened and the plunge pump isnt producing oil when its connected . Undoubtedly some pure gunge got in , ive pumped it through half a dozen times  and it seems ready to go but the minute i re-connect it the oil drops down and wont  rise . 

When i open the bung , water appears to drain out every time .

Fair enough its self inflicted but has anyone any solutions . Its the ultimate penny wise pound foolish move by me , im messing around with it the last couple of days getting nothing done .