Quote Originally Posted by strangy View Post
Yes, no probs supplying enough vacuum whenever required.
The install on friends car is activated when foot on brake only, so no power useage unless ignition on and foot on brake.
That setup sorts AK83 scenario also.

....
Sounds like it makes perfectly good sense.
Something to think about.
Reason I'm thinking of it, is my vacuum pump is currently 'leaking' small spots of oil every now and then .. so have to look into fixing it soon.

Having heard that the 300 Tdi vac pump is a known weak point, plus the issue 130 camper raised in his opening post(re the wear on the camshaft) .. just trying to eliminate as many potential issues on mine too.

Just as another 'hypothetical' install method, is there a timer relay type device available that could delay the operation of the electric vacuum pump say by 8-10sec or so after ignition is turned on?
I remember reading that the glow plugs are on a timer which operate for 8sec after ignition on, and stay on for that 8sec even after engine has started.

My 300 tdi starts in less than 1 sec, and I can't ever recall ever doing a 'pre heat' before starting either.

So(my thinking is), does a relay exist that would keep the circuit to the electric vac pump open(ie. vac pump off) and then close the circuit, and supply the pump with power after that 8 sec period?
.. or something to that effect.