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Just fitted my walbro fuel pump and after looking at a few guides they all say the walbro is smaller then the standard. Mine was bigger?? In the picture its the one on the bottom
looks like your classic had a later model pump fitted, i fitted a 2004 one to mine, easily done, just adjust the bracket a bit etc or it had an aftermarket one already ?!!!?
I replaced mine the other week on my blob Wrx, there's really not much difference in size to the upgraded version walbro 255 version to the standard pump