Polaris 850xp Fuel pressure

I have I 2011 Polaris 850xp it has 43psi fuel pressure running but I was wondering when the atv is off does it need to hold that pressure or will it bleed off over over time while it’s off? I have a little gas smell in my oil and don’t know if my injector are leaking that’s why I’m curious on how long it will take the fuel pressure to leak down to be normal