Po452
#2
Here's the flow chart for P0452, follow it and you'll find the problem:
https://blazerforum.com/forum/diagno...plained-35142/
https://blazerforum.com/forum/diagno...plained-35142/
#3
When i open the gas cap i dont hear any air escapeing like i use to.I didnt fill the gas tank when i put it back in only about 5 gals would that make adifference ? i checked all tcnnections all seems right .doesthat code 452 mean its only electricical?
#7
I'm sorry to bring back an old thread but I'm having p0452 issues and i was looking around it looks like the metal line from the tank up to the engine is leaking would that be able to cause a p0452? its confusing because its only an issue in the morning time/not up to operating temp. either way obviously i gotta fix it but I'm hoping i can stop racking my brain over this now.
thanks in advance
thanks in advance
#8
P0452 is an EVAP DTC indicating there is a fault in the fuel tank pressure sensor, (located on top of the fuel tank) or its circuits. If the steel line is 3/8", (fuel pressure) or 5/16", (fuel return) it will leak liquid fuel when the engine is running, it will not set any DTC's. If the leaky line is 1/4", it is the vapor line for the EVAP system and will only leak fuel vapor, (or vacuum while the system is testing or purging). A leak in this line will cause P0440 and or P0442.