Where is the gas cut off relay on a 1988 190e benz

Could be either a bad fuel pump relay or a bad Ets relay.

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Could be either a bad Fuel Pump Relay or a bad ETS relay, or the relay has corrosion on its connectors.

If you need further help, reach me via phone at https://www.6ya.com/expert/daniel_4061c3d97c12c4c7

Check fuel pump and fuel pump relay

EITHER A FUEL PUMP OR FUEL PUMP RELAY. THE RELAY IS THE CHEAPER PART

Hi, My thoughts exactly ( fuel leak). Is this a deisel or gas engine?
In both cases be very careful with lights or cigarettes.
You can smell it when you get out of car in a garage or stall.
Good luck.

My 1993 220 Mercedes automatic cuts out when I brake and sometimes when I put it in drive too. Does anyone know why?

Do notice that the cut out happens as you brake? Have you had an ABS warning light on the dash? If so it could be that you have blown the fuse in the Over Voltage Protection relay, Its location varies but try looking behind the battery> If there black box about 2cm x 2cm in plan and 6cm high that is likely to be it. The box should lift straight up to reveal a clear plastic lid over the fuse (10amp bayonet type - red). Change it if blown. The car should sort itself out in a matter of seconds.

It sounds like a fuel delivery issue. Mercedes recommends replacing the fuel filter every 60k. If it has been longer than thast since the filter change start there. Fuel pump relays are another common problem on this era. They are located behind the battery. Remove the plastic cover and you will se 2 black relays( yours may have a mass relay if it is a 90 model year, it will have a plastic knob on top that you turn to the left to unsecure it) IT will say kickdown on it the climate control is the other relay and it will say klima. Look for signs of corrosion on the solder pins. If your fuel pump(located at the right rear) is very noisy when it operates I wouild recommend replacing it. During this era of Benz about the only way to diagnose this would be to run a bunch of fuel pressure tests and to drive vehicle with a meter on the relay and on the pump to see if the relay cuts out or the pump cuts out. I always recommend to do both pump and relay because they can cause one another to fail. good luck.

Ignition system. For failures that cut out like this is a common sign of a ignition system failure

it may be a faulty relay