My 2010 Sentra SR wont start after sitting for a couple of day

Is the engine turning over and won't fire? It could be that it has the original battery and it is weak. Batteries last from 3-5 years and yours is on the edge. Get it tested at the parts store.

Can you open the radio or the headlights? Are the dash lights dimming when you try to start the car? Is there any noise when you're trying to start the car (starter noise) ?

The battery is in good condition everything work, the gas pump, the light, radio everything and it cranks like its about to start but nothing. I was reading online that its something with the fuel pressure since it happens when i dont use my car for a couple of days. I press on the gas turn it on and nothing i press on the gas again and then it starts. This happened three times already and i dont know what it could be. Please help!

I read this online 'common issue with these cars is the fuel line does not have a check valve in it and it allows the line to depressurize when it sits. installing a check valve close to the fuel pump will alleviate the problem, as well as just turning the ignition to the on position for 30-45 seconds before starting." does anyone know if this would work?

It could be a gas line or pump problem. Turn the key to the on position amd leave it there for a few seconds without starting it. Do this 3 times. If it starts, your fuel line is probably depressurizing. You will have to find where it comes from then. It could be at one end or the other or the gas line itself.

i tried doing this leaving it on for one minute but then it just cranks about to start and nothing. I heard it something with a valve pressure?? I really dont know

If it's under warranty, just bring it by the dealership. I just finished owning a 2010 Sentra for over 3 years, and never had a single problem. The Battery could be bad and is covered by an 84 month warranty. The Batteries Nissan uses are actually made by Interstate, a good company. Have the battery checked and if possible bring it to the Nissan dealership. It's a myth they are more expensive than corner service stations. The independent shops charge as much or more than many big dealers. The other issue could be a fuel sender unit. Not much to your issue, just have an expert look at it. Free towing to the dealership included in the 3/36 bumper to bumper and 5/60 powertrain warranty. 1-800-NISSAN-1