Thanks Loewchen,
Its works actually. So it bcos of automation

So conclusion is that : Pump will only work with automated trains

It was working really fine before, then suddenly I was out of plastic. Upon checking I found that I am out of gas (petroleum gas). My wagon was full with gas, but (here is the original problem ) I can not take it out from the wagon. yes, checked that it is not on curve. and station is not compulsory...

I have similar problem but the solution is meeting all the criteria and still not working for me