Ok so last week i replaced the fuel pump in my 92 z28 with a factory AC Delco pump . Now the car runs just fine but heres the deal after driving the car around for a few hours i hear the fuel pump start to moan so to speak, it pulsates and the more you drive it the louder it gets . When this happens there is a-lot of pressure is being built in the tank i do mean A-lot More then normal. Second the car starts to hunt not alot but enought to here it .Third i smell gas all the time .Any help would be great. Thanks

 

it sounds like the vent line going to your charcoal canister is blocked.

Did you hook it back up when you installed the new pump? was your sending unit in okay shape? Is your purge valve connected on your charcoal canister?

 

Yes sir I did, my sending unit was just replaced recently .and I checked all lines everything is correct . I mean iv changed my fuel pump a few times but iv never encountered this issue before.

 

i have the same exact problem i changed my fuel pump and and sending unit it drives me crazy. let me know if u find a soulition cause i was think maybe the pump are cheap and i need a high profance one.