# I have to manually cut off my engine **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** mercedes-benz, 300\ **Created:** [January 2, 2010, 4:57pm UTC](https://community.cartalk.com/t/i-have-to-manually-cut-off-my-engine/41679 "2010-01-02T16:57:54Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![brucie\_Loo](https://avatars.discourse-cdn.com/v4/letter/b/bc8723/32.png) [@brucie\_Loo](https://community.cartalk.com/u/brucie_Loo)\ **Post date:** [January 2, 2010, 4:57pm UTC](https://community.cartalk.com/t/i-have-to-manually-cut-off-my-engine/41679/1 "2010-01-02T16:57:54Z")
i own a 1984 mercedes 300 turbo diesel station wagon. when i turn off the ignition and extract the key, the engine would run until the fuel completely ran out if i did not pop the hood and hit the “stop” button for a manual shut off. can you help? brucie Loo ---
**Author:** ![Caddyman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/caddyman/32/23_2.png) [@Caddyman](https://community.cartalk.com/u/Caddyman)\ **Post date:** [January 2, 2010, 5:08pm UTC](https://community.cartalk.com/t/i-have-to-manually-cut-off-my-engine/41679/2 "2010-01-02T17:08:10Z")
Benzman will be here shortly, edit your post to include 300D in the title line… But I think there is a electrical cut-off solenoid that cuts off the engine when you turn the key off…It’s on the injection pump, near that manual over-ride lever…(I think) ---
**Author:** ![minor\_morris](https://avatars.discourse-cdn.com/v4/letter/m/839c29/32.png) [@minor\_morris](https://community.cartalk.com/u/minor_morris)\ **Post date:** [January 2, 2010, 8:47pm UTC](https://community.cartalk.com/t/i-have-to-manually-cut-off-my-engine/41679/3 "2010-01-02T20:47:10Z")
it’s called thr fuel shutoff diaphram, located on the injection pump. it’s cont5rolled by vacuum, so check for a bad vacuum hose