Hi Adge,
I guess you must have changed the fuel filter as you're now trying to bleed it? I can't remember the grey clips, but if it is still a problem then I'll go and have a look. (We are snowed in at the mo')
As for the bleeding of the fuel system: yes, what a pallaver that was; I bought two bulb type hand bleeding pumps from Halfords, one was for a Vauxhall and the other was a general type that I modified to fit between the pipe coming from the tank and the inlet to the fuel filter, pumped until my hand was falling off and fuel eventually got through after cracking the union where the fuel pipe out from the filter goes into a join on the upper right hand side of the engine. Again if you have no joy with the pump get back to me and I'll try to be more detailed ( it's been a while! )
Regards,