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P0446 Replaced Purge Sol. And Vent Valve. What Next?
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Question
helomechs
this started about 9 months after i bought the truck, (bought in jul 03) its an 03 silverado extended cab 4.8L
i got a p0446 evap sys malf. i also noticed my hisssing sound when i open the fuel tank had dissappeared. i know the system vacuums out air during cold start ups 15-85% fuel level etc. and that was probably my hiss right? regardless i ignored the code cause i dont have to smog it anytime soon. well i erased it and it didnt come back for a year. erased it again maybe anothe 6 mo. before it came back. so i did lots of research on this site and concluded i should replaced the purge solenoid and upgrade to the "robust vent valve" since these were the 2 most likely causes judging by several topics on this site. i erased the code and it has yet to come back. but i really expected to hear that hissing noise again and since i dont i am expecting to get that light back again. will somebody clue me in on whats happening? how do i know replacing those two components did anything?? and should i be concerned that my tank no longer hisses? be advised i currently have a loss of injector pressure problem which i am sure is a back check valve on the pump assy. i already replaced the pump assy. once because a wires rubbed through the transfer tube coming from pump top top of unit. so it leaked down all pressure at injectors. currently i just give it a 2 second pause after turning the key to let the pump run before starting. so what do i do next???? how do i test the tank to see if its working, i see an attaching point at the purge solenoid... should i check here for vacuum or something??
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