Peter, check the fuel pressure first then go from there, other wise you just shooting in the dark with no data, when you pull it out take a big rag or tee shirt and stuff it around the overflow valve so you can catch the washers. If you drop one and look for it for 20 Minutes you will not be happy... ask me how I know that, then you will put same banjo washers on you list, I carry 6 spares.
Jim