When was the last time you saw a geared fuel pump on a petrol 159 ? Re check you info on petrol injectors contaminated with diesel.
I reiterate my comment diesel in a petrol car is much worse than petrol in diesel car.
The petrol pump is either internal gear of palette pump (I haven't opened a 159 yet but many others, rather rare in petrol version ), both positive displacement and either will run with Diesel in Petrol mixture. Even engine oil for that matter.
Diesel in Petrol will be like running 2 stroke, depending on the mixture, it might be to high for it to ignite even with spark plugs. But if low enough it will run.
For example my parents in-law did it a few years ago, to what I could gather the mix was not far of 50-50 leaning more towards 60-40 in favour of petrol, the car ran, not well though with a lot of smoke (the smell behind must have been horrible), at the next stop they refilled with petrol and the car never had to go to the garage for repair.
But at no time time will create physical (mechanical) damage, if the proportion of Diesel was to high, a good ultrasonic clean, will put the engine back on the road.
Not like if you put the same percentage of Petrol in Diesel, then the wallet will suffer and go on a mega diet... HP pump and injectors are not cheap, labour neither.
Anyway, I leave you with your ideas, and whoever thinks like you.