Hi and please forgive me if this is addressed elsewhere.

I need to replace my '93 ETC's fuel pressure regulator, but when I removed the top cover to expose the FPR, I saw that the vacuum hose that attaches to the top nipple is missing. Where does it come from so I can look for it? I'd heard it comes off the brake booster, but I could find no unattached hose from there.

Thanks in advance.

 

The hose is inches away from regulator on intake manifold. Its (approximately) 2.5 inches long, curved, and skinny. It is hard to see without a flash light.

Just a quick question wsh777, I am experiencing similar problems with my 97. I Have a vacuum leak around my throttle body and behind the glove box. Long story short my car is knocking.

Could the vacuum leak be the cause of a knocking engine?