Would a fasting diet help a binge eater or would it make it worse?

I'd suggest starting the ketogenic way of eating at first.  You'll discover you don't go around hungry..... there is a lot of good information about how to start and more, on YouTube.  Fasting is great, but it might be a good idea to look at YouTube videos about that, too.  

I'd also suggest that you wait a few weeks or a month before you start fasting.  Fasting can also be not eating from suppertime until lunch time, which is 15 hours, give or take.  That's also a way to start fasting.  

Some suggestions about people to watch on YouTube would be Dr Ken Berry, Dr Eric Berg, Thomas DeLauer and even Dr. Josh Axe.  All great info

1. Trying intermittent fasting

Intermittent fasting (IF) is a pattern of eating that involves regular short-term fasts and consuming meals within a shorter time period during the day.

2. Tracking your diet and exercise

If someone wants to lose weight, they should be aware of everything that they eat and drink each day. The most effective way to do this is to log every item that they consume, in either a journal or an online food tracker.

3. Eating mindfully

Mindful eating is a practice where people pay attention to how and where they eat food. This practice can enable people to enjoy the food they eat and maintain a healthy weight.

4. Getting a good night’s sleep

Numerous studies have shown that getting less than 5–6 hours of sleep per night is associated with increased incidence of obesity. There are several reasons behind this.

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Essentially over time fasting will lead to other issues with the GI system. But it would reduce the size of the stomach. Thus forth binge eating can only go so far. 

Makes it worse.