Easy to do. Youtube will guide.
Coupla tips.

Try to use all ONE length runs. NO joiners.

Press couplings in till they "click".
Don't use the cheap Small pumps.
They have noo push on long runs.

OH. and have pump as close to supply tank as poss.
They ALL push. better than they suck.

Have fun hey.

We use a Singflo pump in our Avan - they are on Ebay for $21.50 delivered which is one seventh the cost of the Shurflo units being basically a copy - ours hasn't missed a beat in 7 years. They have push on fittings which if properly connected will not fail (same the Shurflo ones I think) - we replaced all the factory installed hard plastic John Guest fittings after we had 2 of them blow off....changed it completely by using new 1/2" air hose. This way the hose goes round sharp corners easily so you only need 2 lengths so less joins, does not vibrate like hard plastic when the pump is going, has no bad water taste, cheap and easily available. For a tap you can use a Estilo sink mixer tap with ceramic seals for $24.90 from Bunnings.
Doing it this way you can end up having it cost under $100 for the lot and its pretty easy DIY.

Edit....you also need a fuse and switch to the pump as it's best not to leave any pump switched on when leaving the van unattended.

http://www.ebay.com.au/itm/High-Quality-12V-Water-Pump-4-3Lpm-Self-Priming-Caravan-Camping-Boat-FAST-POST-/252466975081?epid=1087925166&hash=item3ac8345169:g:cwwAAOSwaB5Xjc8S

Good Luck..

-- Edited by hako on Saturday 29th of July 2017 10:02:12 AM

Got rid of the JG fitting from the tank to pump and pump to tap.....no joins to fail just 2 lengths of air hose. Re the tap, if you buy it go to their plumbing and irrigation sections and mix and match fitting to adapt the tap to hose.
I put a switch on the pump at a convenient position near the tap because the pump operates when it detects a drop in pressure....this may be as little as 20 drops of water dripping from the tap not fully closed or just the valves in the pump leaking slightly - at 2AM the pump starting can give you a fright!! It also is cheap insurance.

Regards

Horses for courses Bagmaker, I've never had a problem - do a Google on faults for both and see what shows up..
To silence the pump if you think it is too noisy you wrap it in foam, and yes they don't pump as fast as the one that costs 7 times as much but then, what's the hurry?
Shurflo pumps are also noisy - check the other forum. Using the flexible air hose also reduces vibrations whereas the rigid JG hose transmits vibrations.

Regards

There is a big $ difference between the 2 brands. Thanks for the info guys.