The A/C vacuum is off the same source so it could be related. As Donnie mentioned the "shut-off" system uses brown lines. See if you have vacuum at the source and then at the servo (on the inj pump), when the key is turned off.

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Steve Brotherton
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician

[This message has been edited by stevebfl (edited 06-17-2000).]