Pump working poor flow from tap.

So a little bit more information, is the pump outside in the aquaroll or inside? And working how? Hot and cold both affected

OK a few possible hints and some may be obvious so apologies.

If the hose outside kinked or not straight in the aquaroll?  Is there water in the aquaroll (sorry maybe too obvious), are you on EHU or battery and the battery is OK? The drain value hasn't become open by any chance? Any leaks anywhere?

Pump in Aquaroll. Pump pipe is straight and not kinked. All valves are closed. Aquaroll full. Both hot and cold affected. On electric.

Ok so you can hear the pump whirring away? Do you have a pressure valve? It looks like a knurled wheel that you can turn? There may be something broken inside the pump or have you tried taking the pump out giving it a (mild) knock or shake, there may be an air lock. Or take the pump out and disconnect the hose from the caravan and do the same?   

Failing that you could try replacing the whole hose/pump? Site offices may sell them or the wardens might have a spare?

or do a complete 're-boot' and empty the tank and start again?

We had same problem switch pump off take it out of aqua roll and detach from van then shake pump from side to side replace turn back on and try it worked for us 

Try replacing the two rubber washers where the fitment connects to the caravan. It took us ages to work out the problem but it worked and very cheap to purchase

An airlock in submersible pump is quite common. It won't happen, or can be cleared, if you put the pump in the aquaroll before plugging the pipe into the caravan.

This will allow any air to escape up the pipe.

To ensure that I suck the water up so that it is running through the connector before putting it to the van connection.

Oh ,Just a thought !! Have you taken off the 'aereators' lately from the taps ?? They do need cleaning out periodically .Cal' and detritus collects on the filters !! .

Aerators on taps is a good shout. I had this problem. Simply unscrewed and there was debris. Cleaned and normal service resumed.