Hello, I have a 2000 pontiac grand prix that just had the fuel pump replaced and fuel filter amongst a million other things and just today my car wouldnt start. I turned the key and it wants to kick over but wont and I heard a hissing noise from the rear. I then took the access panel off through the trunk to see if any hoses came undone and couldnt find anything visible. I was getting ready to leave work when this happened. And I couldnt see anything under the car, no oder of gasoline and no visible puddle. Im thinking there is a vaccum leak from the fuel pump line because the car had been sitting almost two years before I got it on the road again. Any ideas guys on what it could be and/or how much it would cost, if i do it myself, and if its easy enough. I know a lot about my car but not enough to know everything. lol