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!

"If spending money you don't have is the height of stupidity, borrowing money to give it away is the height of insanity." -- anon
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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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