78 240 D vacumm - Mercedes-Benz Forum

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post #1 of 3 (permalink) Old 05-10-2007, 02:20 PM Thread Starter
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78 240 D vacumm

Does anyone know how much vacumm these cars need to operate correctly?
I installed a vacumm pump kit and I'm getting about 4 - 5 lbs of vacumm and the shut off valve isn't shutting the car off. Thanks! Clark
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post #2 of 3 (permalink) Old 05-10-2007, 03:20 PM
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Could be a vacuum leak, could be a bad shut-off valve. They do fail with some regularity. Welcome to BenzWorld, BTW!

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post #3 of 3 (permalink) Old 05-10-2007, 04:13 PM Thread Starter
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Thanks! : )
When I pump my handheld vacuum pump which I attached to the shut off valve, it shuts off right away. I've replaced the lines from the ignition switch valve on the ignition switch and installed a new valve there as well. The rest of my lines hold vacuum just fine when I test them, so I think everything is okay. I'm thinking my rebuilt vacuum pump just isn't generating enough vacuum pressure to operate the fuel shut off correctly. When I drive the car, I'm only accummulating 4 - 5lbs.
Thoughts? Thanks, Clark
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