You have a fuel injected vehicle unless your van is made before 1992.
This will not typically cause any problems as the fuel lines inside the tank do not draw fuel in from the lowest point inside the tank.
This is designed to prevent moisture, which is heavier than fuel, from being drawn into the fuel lines as well as any possible debris.
The fuel pick-up tube inside the tank typically sits about 6-10 millimeters off the tank's bottom point.
Gas up and go.