Problem fuel tank (Pressure measurement)

Dear Users,

Excuse my English, I really do not master the language much

I have been using SolidWorks simulation since past few months and have mostly done Static analysis, so i am still an amatuer. It is hence i would like to get your help in a problem that i am facing.

Description:

     We have a fuel tank 2 mm thick has the same material ASTM A 36, is to simulate the pressure that holds it, and it became a prototype and holds between 10-15 PSI, but when I simulate it indicates that material is fractured and deformed it, the problem is that we have to send the report to the client with the simulation.

Therefore I require your help to make this simulation

Attached pictures of the actual tank simulation and CAD, if you also have a suggestion to shorten the simulation time and it takes a lot between simulation

SolidworksSimulation