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Hi, my name is ***** ***** engine do you have in this?
ok, the P0456 and p1494 are related and is most likely a bad vacuum line at the leak detection pump, the P0305 is a missfire on #5 cylinder, can be caused by a bad spark plug or coil, none of these relate to anything with the fuel pressure, does the engine run good?
the lines at the cannister can also cause the first codes, and can cause a hard start, the easiest way to find the vacuum leak is with a smoke test, most shops can do this test for about 40 dollars, they use a smoke machine to pump smoke into the syatem, and even the smallest of leaks will show up, the most common places are at the leak detection pump unde the hood, or at the emmissions cannister under the c=vehicle by the fuel tank,Tim