Hi all I've got a zd30 with a leaking vacuum pump I changed the o ring in it an it still leaking any body got any Ideas as to why.?

Hi Josh,

Have u checked the vacuum lines aren't ruptured? Also have u checked it holds pressure after the car is off? You should get up around 25psi or so. Possibly have to check with a vacuum gauge.

So if it doesn't hold vaccum can I assume it will make the pump leak?

Nope that is incorrect.

Very common problem is small vac line in to turbocharger is split. The result is car feels sluggis as turbocharger can't alter its vanes at low RPM so no boost. Another quite common issue is on series 3,2,1 (up to mid 2004 models), they have vac canister which leaks like a sieve. It can be easily by passed to check or confirm and left disconnected with no adverse effects.

Regards