Problem R19 Monopunto Injection Mod 96

Good, I introduce me, Mo name is Nicolas, and I would like to know if someone can guide me with the problem I am having in an R19 Iny. monopunto that I acquired 1 month ago. The theme is like this:

the car works correctly, but suddenly, with nothing in particular, it stops, as if it runs out of or without a gasoline, if I close the contact and start again, it works perfectly, as if said fault had never existed. At first, he did it only once in the day, and in low, now, lately, it makes it very often, both high and low (high at 120 km/h) and sometimes, I close the contact, I start again, and continue to fail, and I have to turn it off and turn on several times, but then the walk is excellent, as if I had never had any fault. It is the first time that I have an injection car, so I don't know where to start, I would appreciate any type of information, thank you very much

If you do not turn on the fault light, the taquimetric relay may be failing, (the one that sends the current to the electric gasoline pump)

in that case, the pump for, the pressure falls, and the engine stops, but no failure light is turned on.

Upon starting it again, the relay receives ignition signal, the pump works again and the car walks as if nothing had happened.

All the best.

It seems a rather logical explanation, I will try that, thank you very much, to another consultation, where is this relay located? (je) Thank you very much

In a black box on the left side of the engine compartment, to know what it is, you simply tell someone that there will be the Ignition Swiche and when the bulbs are turned on, this relay sounds for a few seconds.