The pressure guage showed me at what levels

This pump works off of a pressure switch. You can remove the cover on the switch located on the side of the pump.You can either buy a switch repair kit, or you can open it up and take a look and see if the diaphragm is sticking. If you remove and clean the parts, you may have some success. Or, just buy the switch repair kit from your local Little Giant dealer. Good luck!

Inspect the check valve to see if the flapper is stuck shut causing a restriction in the .

A check valve is simply a one way flap, or a ball that rolls forward to let water flow in one direction. My guess is if it's making noise, either the pump is not producing an even pressure or the line is not properly secured and is hitting inside a wall. Make sure the line has straps every 3 foot and at any bends.

The oil pressure switch or sending unit is a unit that receives an electrical signal showing what your cars oil pressure is.And yes it does partially does let you know when there is a problem somewhere in the oil system.For example if your filter gets clogged up your oil pressure will go down and then go up when you accelerate.If there was a leak in the system first you would probably see the leak And if the oil pump or oil pump shaft were to break you would have no oil pressure.So you can see the importance of having an oil pressure switch.I feel there are 2 guages that are important to watch are your oil guage and water temp guage they can tell you allot about how your car is operating.

It could be you have an obstruction in water flow. Are you sure your check valve is correctly installed ( not reversed ). If there is no check valve you might want to install one. A quick way to find out is to use an amp meter and monitor the amps. If it goes beyond the F.L.A. on what the pump is designed for and does not come back to norm after a few seconds, than this is what is probably happening. Be safe and always call an electrician.

For this pump to turn on, it must be under 7" to 10" of water. The water gets into the switch housing (which has an opening in it) and water pressure pushes on the rubber diaphragm (much the same as you did when you removed the cover). Once the pump turns on and lowers the water level to between 1" and 4", the pressure of the water will not be enough to keep the switch closed and the pump stops automatically.
Gary

Flotec website shows several submersible sump pumps, and pump types:
http://www.flotecpump.com/asp/productapplication.asp?AId=28

Click product, then click on 'parts and literature' to access manual
Here is a Flotec manual:
http://www.flotecpump.com/pdf/FP525%2811-1-06%29.PDF

Manual for this type of sump pump says:
Quote from manual: Automatic float switch is sealed and factory adjusted for
most home sumps. Turn-on water level is 10" - 12" above
pump base. Turn-off water level is 4" - 6".

The manual also says that running the pump when dry will ruin the seals.
This implies that the water level setting is set so the seals will not be damaged

You might be able to dig the sump deeper, but I don't know if that meets your objective.

yOU NEED A FLOAT SWItch to have the pump work unattended. I have two new switches and no use for them, Where are you?

I assume this is a new instalation or you just removed and reinstalled to pump. As you have power on the load side and we assume your wiring to the pump is correst, you need to open a valve on the output side of the pum and bleed the pump. They will become air bound, Leave the valve open until it flow freeley. That should do it

Good Luck

You either have a loose/worn engine bearing or a worn out oil pump, do not drive the car this way, you will cause serious damage to the whole engine. A oil switch is for a light, it turns on the light when oil pressure falls below about 10 PSI, a sending unit is for a guage that shows oil pressure with a scale, it may have numbers on the guage or just green and red, or high and low.