My pump stays on after having a shower sometimes...

Can you describe the pump you have? Is it used for household water or a sprinkler system? Typically a household pump will have a storage tank and a pressure switch. 90% of the problems with a pump not turning off is due to the pressure switch.

Rural means out of town or out in the coutry. Outside city: found in or living in the country typical of country relating to or characteristic of the country or country living agricultural relating to, characteristic of, or involving farming

If you have the same Autocirc product I have, then it cannot be taken apart. The timer seems to be connected and sealed together with the pump. If yours is different, answer back with the wires that you can see and we'll see if the timer can be by-passed.
http://waterheatertimer.org/Water-heater-recirculation-system.html

With the ordinary Grunfos-type pump that is not on a timer, you can add a switch and have the pump work on demand as you describe.

And they make a product that does the specific job you describe. It's called a Demand Pump. Link above shows two different types at page bottom.

I have not tested either Demand Pump shown. They operate on-demand ... when you activate the pump, the pump quickly brings water over from the hot water heater.

So the Demand Pump has a higher volume pump than the Autocirc or Grunfos.

I question a two things about the Demand Pump. 1) How will the increased pump pressure affect local pipes, especially supply tubes under a sink. 2) How HOT does the pump get? If pump gets hot, and it is located under bathroom sink next to paper goods, then that is a hazard. Some regional building codes don't allow ceiling light bulbs in closets because the bulbs get hot and start fires when people pack their closets full.

your replacing everything but the problem part which boils down to the pump its 10 yrs old and you havent tested it either bearings or winding failing in motor

that pump is likely to be a hot water return pump not a booster pump. it sound like a large property so its likely the hot water system requires balancing to get the hot water to the extreme areas. If all the hot outlets have some form of isolation valve try closing all but the affected areas and see if hot water comes out. If so only open the closed outlets enough to give you reasonable flow. This hopefully will force the hot water to the affected areas.

Auto/self adjusting anti-scald feature in shower body and /or flow meter defective/cloged.

If you have good water pressure to every other hot water faucet inj the house then the problem lies in the shower valves. There are some very small passages in the valve and getting dirt removed can be very hard to do. You could try trurning the water off and blowing air back through the shower or taking apart the valve and flushing the valve out with it dissasembled.
But my opinion is that the problem is in the valve.

We have a maserator in en-suite which serves the toilet & shower, We moved in to house 6 years ago and it was already here. After having guests stay a couple of months ago the maserator hasnt worked properly. When we flush the toilet, the water rises and whilst the cistern is filling with water, there is a humming noise for a couple of minutes, then the water rushes back down and there is a clonk and the water bubbles back up through the shower plug hole.Any suggestions as to what this problem is & how to fix it please?

hi did you run a seperate cold water supply from the storage tank to the shower pump & also a seperate hot supply from the hot water cylinder, it sounds as though the cold water is crossing into the hot service & pushing its way up to the tank as its the only way it can go, sounds as though the cold water connection to the shower is not tank fed & possibly directly off the water main.?

Hi davecross,

I'm Harvey, the Master Plumber.

Your question is:
water pressure not great would a external pump help. Depends on your situation. If you live in a house with a well pump then turn up the pressure. If you have city water and the pressure is lacking then either install a house pump after the meter or if it is just the shower you're worried about then a booster pump on the shower line is the ticket. Be aware that useing the booster may reduce the pressure at the other faucets in the house while it's being used. The house pump will not exhibit this. You will likely need a local pro to help you with installation. Feel free contact me again!
Please give me a rating here at fixya.com before you sign off
Thank you, Harvey, your Master Plumber