First, I have been searching prior to asking q's but I don't seem to find all the info I need.

I got a vac gauge, not a mytvac but similar. The line out of the Pump registers 22in of lift, the line to what I believe is the engine or fuel cutoff to stop the motor has no vac. The vac lines are small diameter hard plastic tubes with larger ruber couplings. The rubber couplings are obviously degrading.

Rather than checking all of the lines, even though there are not that many and trying to isolate a single leak, as if there would only be one , I think it would be better to just replumb it all. Stupid, or good idea with poor execution?

Also, the small inline plastic thingies I think are maybe pressure regulators or modulators ?????? Are those easy to find? Is there a pre fab kit or should I just buy the hose and cut it myself, that sounds cheaper????

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1981 300TD
2005 C55
2004 E500
1999 ML430
1992 400E
1998 C43
2001 SL500
1988 300SEL
1986 190E 16V
1991 190E 2.6