My Mazda 323F engine stops just circulating

Hello, let's see if someone can help me. I have a 323F mazda from the year 2000 and the thing started about 6 months ago when the engine was circulating on the highway. I threw myself to the road and turned it back on and without problem. I was well for another 3 months and the same thing happened again. All good until two weeks ago that Uas stopped 20 times in 30 km.
I would like to know what you can think since the workshop says that the gas injection pump would have to be changed to try, but it seems to me that to try it is a repair too expensive. I have been reading something in other forums, I had the injection relay. Could you help me ??? Thank you.

Look at the bomb, you can try by measuring its precion and now, now something very similar to what you tell but with a great nomade, the thermostat took out and the problem was resolved, I do not know what the cause only I know that it was reconnected and I am still giving it bullets, I also told it with a corsa, which had the same problem, if you help you to you.

Thank you, I will try what you have told me to see if I am lucky with that.

He gave you other failures apart from turning off the light Check Engine? Any detail can be important because if it is rare that is solved by eliminating the thermostat my good kikemec if it is a case to reason good greetings

The water light is turned on from time to time in the diesel tank, although we take it out following the instructions from the manual and also flash from time to time the airbag witness. I don't know if it will have something to do, but otherwise they stop without warning. It is not related to the fact that the engine is very revolutionized or not, when I stop.

I have been reading something of the injection relay. Do you know where it is located in the car? It seems easy to check.

Gracas