PeachParts Mercedes-Benz Forum - View Single Post - Starting my Diesel conversion 2.2 into 87 190E body

GregMN · #26 07-06-2012, 03:58 PM

I used the gas transmission when I did the swap.

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The vacuum operated shut off valve circuit needs vacuum to shut down and then no vacuum (open to free air) to start and run. I use 2 electric controlled air valves.

A: One normally open. It closes when power is applied.
B: One normally closed. It opens when power is applied.

When the ignition is turned on:
"A" closes to prevent new vacuum from getting to the fuel shut off valve on the IP and prevent the venting of the entire vacuum circuit.
"B" opens to vent the vacuum that shut off the fuel to the IP the last time the car was turned off.

When the ignition is turned off:
"A" allows vacuum to get to the shut off valve on the IP.
"B" closes to stop the venting of the vacuum to the shut off valve on the IP.

With this setup my car starts fine and shuts down as soon as the key is turn off.

Most gas cars have one or 2 of these valves. The 190e may have what you need under the hood.
If you go to a junk yard you check the "normal", un-powered, status of a valve by trying to blow through it.
If you can blow through it, it is normally open.
If you cannot blow through it, it is normally closed.

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I had to cut a slot in the air cleaner box to allow clearance for the brake booster vacuum line.