Can anyone shed any light on my problem..

Well I have a Mazda 6, 2.0 litre turbo diesel and I accidently and very stupidly put in £5 of petrol as soon as i realised I thought it wouldn't cause much of a problem if I just filled up with diesel (which later proved to be a huge mistake). After running on it for about 2 weeks, the car would start just automatically switching off on the road.

Now after taking it to over 4 garages including Mazda I'm stuck! I've been told many different things which have not worked.

So, firstly I took it to PF Jones who I've been told is a great diesel specialist, now seeing as the car just will not start it's very hard to actually diagnose the problem (or so I've been told). Anyway after being advised, One garage has changed the EGR valve - which was thought to be the initial problem but wasn't. Second garage the car was put on a diagnostic machine which came out with a long list of POSSIBLE problems, nothing definite so decided to change the crankshaft sensor and timing belt, still the car will not start.

Then it was decided, by yet another recomended garage it was the fuel pump which had gone so after the fuel pump had been changed it was still not starting. Now the garage then advised me it could possibly that the fuel pump was not starting because Mazda cars needed a special type of code for parts to work. After doing some research I found this was not the case at all so decided to take it to a friend of mine who could possibly shed some light. Ended up changing the fuel sender, STILL no luck.

Finally took it to Mazda still nothing could be found, now the car is not starting and I feel i've put too much time and money into just selling as a non runner! But its proving to be almost impossible to find out whats actually the root of the problem!

Anyone ? Help will be VERY much appreciated?