I have been getting a PO452 about once a month for awhile now. and every once in a while there is a fuel smell. I have looked it over and can't find any wet leaks so I think I am just losing vapors. Tried the cheap fix of a new gas cap but that didn't change anything. Just looking for suggestions on what to check next. Happens once a month maybe my truck is on its period. Oh yeah its a 2000 4.3 Thanks.

 

P0452 Explained

 

i have the same issue. in march i replaced the fuel pump (ended up just being a bad wire to the pump) now the light is on p0452 i checked the voltage to the fuel pressure sensor i hve 5 volts (normal) seems the sensor in the tank went bad. first check for bad wires te 4drs seem to get rubbing of loose wires on the drive shaft while 2drs get rubbing by the trans cross member