Couple of fuel system questions

[Big Jay]

Hey guys,

I'm just about to rebuild the 2 fuel pumps on my '69 1000ss as part of a fuel system overhaul and looking at my parts catalogue, it shows them as 2 different part numbers. My question is what, if any, differences are there between them?

Also, what's the best way to go about servicing the bleed lines on the block?

 

[jimmbo]

I sure there are many different Part #s on the parts list. Sometimes there was a change during production, and therefore sometimes there will be a part with two or more #s. However there is usually a footnote with regards to Serial #s as to which motors use which version

 

[Faztbullet]

Diaphragm is the same the gaskets on each side of it has different cut-outs