Engine won't start after being on incline
 

1998 S70. My driveway has a slight to moderate incline. When I leave my car overnight on my driveway, it won't start in the morning. Acts like it's not getting fuel. If I coast it down to the street which is level, it will eventually start. If I leave it overnight on the street, it starts up fine in the morning. I'm thinking it's the rollover valve? Any thoughts? Could an amateur mechanic (me) replace the rollover valve?

RE: Engine won't start after being on incline
 

I don't think it is a rollover valve. That only has fumes going through it.
The pumps usually have a check valve in them.