Cranks up fine when cold.
Once the car is at normal temp and i have been driving for 15 minutes and making two trips. The third trip, I have to press the pedal slightly and then turn on the ignition for the car to start. So far, I have replaced MAF, fuel filter, fuel rail sensor, O2 sensors. What is the fuel pressure that i should see when starting ? Thinking of replacing the Fuel Pump Assembly XR852870 , it is expensive. So any other ideas before i go ahead ? Thank you

 

Use OBD to check things for sanity.

Especially IAT & ECT as it's relying on them (partly) to get fuel/air mix right.

Another not likely possibility would be a dribbly injector.

 

What parameters should i read via the OBD scanner: Before cranking and then after cranking ? Also What is IAT and ECT ? Thanks

 

See my sig

or web search such as
obd iat
obd ect