I bought a Miller's Falls petrol pump 4 stroke from ebay brand new @ $200. The first one was crap, replaced for a second one and it is working fine. My mates one I had mentioned is similar to the 750W one you posted from Bunning, but he has a 1000W one. Make sure if it is a dirty water or large particle submersible. That way if you need to, you can suck some crevices 
Check the inlet hole to make sure its about 1" - 1.5" in diameter to do this though.
If you need to save, there is nothing worse than buying the right pump, trust me, I have been through it all! If you are able to, throw in a good river sluice into the creek and collect enough gold to get a new pump, electric pump + generator. Or make a rocker / cradle type sluice and start simple using a bucket of water each time you run material through. ( I really, REALLY wish I kept it simple at the start )
The problem is with a generator, you have a risk of putting the shovel through the cord while you are in the water. You can get around this by putting the cables above water using "Y" sticks.
The problem with a 2-stroke: too bloody noisy! Yet light. I could not handle the noise! I bought the 2-stroke from bunnings. Useless 3/4" outlet as well! Also mixing fuel can be annoying.
Problems with the 4-stroke: Making sure the oil stays away from the sparkplug, but not too much of an issue. Try not to buy a chinese one like me, but the second one has been fine ( so far. )
Check the inlet hole to make sure its about 1" - 1.5" in diameter to do this though.If you need to save, there is nothing worse than buying the right pump, trust me, I have been through it all! If you are able to, throw in a good river sluice into the creek and collect enough gold to get a new pump, electric pump + generator. Or make a rocker / cradle type sluice and start simple using a bucket of water each time you run material through. ( I really, REALLY wish I kept it simple at the start )
The problem is with a generator, you have a risk of putting the shovel through the cord while you are in the water. You can get around this by putting the cables above water using "Y" sticks.
The problem with a 2-stroke: too bloody noisy! Yet light. I could not handle the noise! I bought the 2-stroke from bunnings. Useless 3/4" outlet as well! Also mixing fuel can be annoying.
Problems with the 4-stroke: Making sure the oil stays away from the sparkplug, but not too much of an issue. Try not to buy a chinese one like me, but the second one has been fine ( so far. )
