thanks dave i have followed your instructions for dismantling pump,i have also registered at citroen service web site but i think there having problems with the sight,after registering i cannot access the site will try again tomorrow. anyway after taking the pump of i discover the pump i got from the scrapper is the wrong one it is a three pipe instead of two even though he insisted it was the right one,will be phoning tomorrow. so i am only a little bit further on can anyone tell me why you can't repair the pump because it looks to me that the gasket is missing on mine or was there never one fitted from new,which seems strange!!the pump itself looks to be in good condition the rubber seal looks to be okay and except for no gasket i can't see any fault so unless there is some dire reason why i will try some liquid gasket and see what happens. let you know what happens. old lager.