Quote:
Originally Posted by cleavster
...(1) Fuel Tank Purge/Regeneration valve (107-470-08-93-M22) - this valve is connected to the throttle body, charcoal canister, and to a solenoid switch.
What is the best way to check this? Can I just pull it out? Not sure how it is all connected inside the inner fender...
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There are ways to check it.
The fuel tank vent valve is supposed to hold 0.7 psi of pressure and up to 0.5 in-hg of vacuum (not much). Depending on the situation your fuel tank can be under pressure or under a very slight vacuum.
Sometimes what happens is the charcoal canister can get clogged and you will get weird issues like a gas station pump shutting off (happened on my car) or in an extreme case your fuel tank will collapse:
https://www.benzworld.org/threads/screwed-by-a-charcoal-canister.1712285/
This valve is usually located near the rear axle and from there it goes to the charcoal canister and from the canister to the throttle body and some models have a thermostatic vacuum switchover valve on the cylinder head.
Quote:
Originally Posted by cleavster
...(2) Air Pump Check Valve (000-140-78-60-MBZ) - this valve is connected to the engine. It requires a large wrench size and I'm not sure what is the best way to remove and test the valve....
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To test it you can check for a vacuum leakage with a vacuum gauge to check for a torn diaphragm.
Of course check the vacuum line routing and an electrical connection to the switchover valve.
Quote:
Originally Posted by cleavster
BTW, battery voltage is at 14.3V when running
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That's perfect
06-02-2020, 05:27 PM
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