2007 53k miles nissan versa hard starting once hot.

When you put your key in, don't turn it all the way but to the point where everything powers up. You should hear a hum from the lower rear that lasts about 3 seconds. That's the fuel pump. If you don't hear that, it could be the fuel pump.

rattling sounds like a busted rocker and the valves are loose. when it doesn't start on the first try or so, that sounds like a head gasket. they tend to start better when its hot because it swells some and improves compression. I had a dodge do that but it will only get worse if that's what it is. If you don't get it fixed now you'll eventually warp the heads and be looking at a head job or worse a new car cause its terribly expensive to fix the longer it goes

need more info does it run warm

Unless i am mistaken the fuel level sending unit is part of the new pump. Sounds like a weak fuel pump to me or a dirty fuel filter.

you need fuel level sensor replaced. nissan has campaign on those. check with your dealer if your vin number falls into the campaign, which will replace the sending unit/sensor for free, but your VIN has to match the campaigh VINs.go to your dealer and give them your VIN so they can check it in DCS.

2008 nissan versa should still be covered under warranty. take it to the dealer. possibly the anti-drainback valve in the fuel pump is broken and the fuel lines are becoming depresurized when it sits. this will cause the car not to start until the pressure build up.

i would get the 90k major service done and i would also have the hydraulic chain tensioner replaced, have ur battery... chargeing and starter system checked as well..make sure u dont have corroded terminals at the battery.

the sending unit for the gas gauge is in the fuel tank and part of the fule pump module, it is not sold seperately. price around $350.00, 2 hours labor to install the part. see photo

i would say its the ign stater in the distbutor

if it cranks for a longer time than normal and than it starts, you my friend need a new fuel pump rebuild kit/pressure regulator inside the gas tank. what happens is that the fuel will go back into the gas tank instead of staying in the fuel line and everytime you turn the key, the pump has to pump fuel all the way to the injectors again to get the car started. So, long crank and than start means fuel pump rebuild kit/pressure regulator in tank.