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  #1  
Old 06-11-2018, 02:08 PM
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W115 200.4 Gasoline Interruption Problem

Hello. I am trying to find an answer for a problem which sounds simple, but did happen complex enough to me. My friend's car is w115 benzine 200.4 (1971). The engine starts and runs smooth and properly. Unfortunately, when we load the accelerator, the engine suddenly stops running. The benzine can not meet the need. After waiting some seconds, it tuns again. We changed all the hoses and the pumps. We even adjusted the carburetor several times, but the result is same. I would be more than happy to hear any suggestion.

Thanks in advance.
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  #2  
Old 06-12-2018, 05:18 AM
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Hello again, any idea or suggestion please!
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  #3  
Old 06-12-2018, 11:46 PM
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Join Date: Feb 2011
Location: Modesto CA
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r3:

1) The model that you are working on was not delivered in the USA, and most of the people on this forum are in the US, so there is very little familiarity with the model.

2) Would you go into more explanation of this phrase: "when we load the accelerator". Is the car standing in neutral, and the throttle is suddenly opened? Is the car being driven, and the throttle opened suddenly? Is the load continuous, but then increased, as in climbing a hill? Etc.

3) Can you identify the make and model of the carburetor?
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  #4  
Old 06-13-2018, 02:48 AM
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Okay, actually the engine of this model is very similar to 230.4 types. The engine is an M115, 95ps.

Let me explain a little bit more. When we want to accelerate, everything goes normal. The response of the car is very well and it accelerates normally. Approximately 30 seconds later, the engine suddenly stops as if we run out of the gas. At that time, whenever we check the gasoline filter, it seems fully empty. And again at that time, whenever we distinguish the outlet line hose from the carburetor and try to start the car, we always watch that the pump is working very well. After we wait a minute or more, it is possible to run the engine again. We can drive it without any problem, of course , until we accelerate the car or try to climb a hill with any inclination.

The problem seems to me that, somehow the carburetor doesn't want to let the gas go inside. But I have no idea regarding the reason. The carburetor is a very common one, Stromberg 175 CD. It is used in all M115 engines and as far as I know, in some of the Triumph models. It is a constant depression one.
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  #5  
Old 06-13-2018, 11:29 AM
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Location: Modesto CA
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r3:

In the process of changing the hoses, were the hoses at the fuel tank changed? Are you certain that the tank is venting correctly? The engine stoppage, as described, sounds very much like either a fuel hose collapsing under suction, or the tank not venting properly.
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Old 06-13-2018, 11:57 AM
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Location: Tucson, AZ
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I'm with Frank on this. The next time it occurs, remove the fuel cap and listen for a "whoosh".
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  #7  
Old 06-14-2018, 01:44 AM
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Yes, we have changed the short hoses between the tank and the fuel lines under the car. But we haven't done anything regarding the tank ventilation system, since we don't have any experience on what to do in order to make it a properly working one. I'll check it and let you know. Then it will be easier to discuss according to the result...
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