frontier starting issue

[tinys.nissan]

i have an 07 frontier runs great but sometimes it takes a while to start it will turn over for a while before it fires up strange thing is it seems to do it on the 2nd start of the day after that its fine no check engine light so im sure it aint a sensor im thinking fuel pressure but not sure so im on here seeking some advice thank u

[mdmellott]

Hard to say with little to go on. Got to rule out or deal with the recommended maintenance stuff first, which might cause this behavior. How many miles do have on the current spark plugs, fuel filter, and air filter? How old is your battery? What is the measured output voltage of the alternator?