Servicing instructions for Whale tippytoe water pump?

Thanks for the advice Roachie, I will try and keep with the tippytoe for the conservation of water. Have to keep 'responsible' in our uses of what is one of their smaller tank configurations, I think it is not much over 60ltrs in a plastic tank.
I will feel reasured and go for taking the whole thing out and go from there.
cheers

One thing led to another and I ended up retro-fitting a 110 litre water tank in place of the 60 litre original. Ultimate sell this size tank now....I fitted it myself.

Thanks Keith H7,
I have removed the pump and before doing anything else I tested it in the Kitchen sink, (the home of all good experimentation) . I found that the pump pumped equally both on the down and the up movement.
The result is, I looked under the van and found that the first u shaped clamp holding both inlet and outlet hoses had seemed to clamp down more on the inlet than the outlet, whee i replaced those drive clips and also attempt to remove the pressure on the first clamp.
The next step is to find a replacement for the outlet flange that matches what I cave come to believe to be is an Imperial Thread, not the common metric.
Step one and then step two or in mycase step two is contingent on completing step one.... that is the product of enthusiasm and not much experience.