First, never install a higher than recommended amperage-rated fuse as you risk frying the circuit and causing a fire.
The blown fuse is 15A fuse 44 under the hood, right?
Obviously, you have an electrical short. To pinpoint the short, unplug components one at a time on the circuit to see which disconnected component does or does not prevent the fuse from blowing. You may need to buy a box of 15A fuses for these tests. Start by inspecting the fuse slot itself. Do you see any signs of burning or damage? If not, proceed with the test below.
Unplug the the connector for the components below in the order. Stop the test when you find the first disconnected component that does NOT prevent the fuse from blowing, even if it is the first component on the list. Post your findings.
1) main relay
2) all four fuel injectors
3) IACV
4) ECU connector A