just fitted a cossie fuel pump into my RS1800 fuel tank it is easy and only £95 from burtons. Some of them have an inspection flap under the back seat but mine didn't so instead of messing around with those corroded bolts and nuts that were snaping as I tried to remove the fuel tank I just used an angle grinder to cut out an inspectionplate under the back seat and then removed the fuel pump from the tank very easy.