Curious as to your opinions…
For the last few weeks, finally driving my 88 XJS a lot, I’ve noticed my new bosch fuel pump was always noisy. (I renewed entire fuel system and tank) I also noticed I always had high positive pressure in gas tank, I’d open gas cap after a drive and gas vapor would burst out.
So I was starting to assume my Rochester valve was stuck.
Suddenly a few days ago, the fuel pump noise went away, as did the vapor pressure at gas cap. So far so good.
I assume the Rochester valve somehow unstuck, if it was that in the first place? Car was sitting for years before I got it.
I still am going to investigate the valve, but I’m wondering if this all makes sense.