I just spent 3 hours trying to get the Walbro fuel pump to fit back into the casing and it still doesn't fit right. I cut off the plastic spacers on the Walbro and it still was 3 mm too big. In addition to that I had to take off the rubber spacer between the clip that hold the fuel pump into the fuel pump housing in place. I'm not exactly sure how that will affect it but that was the only way I could get everything to fit. The whole thing has been a complete nightmare, my fuel level meter isn't working properly. I'll take a look at it tomorrow. Any one that is trying to do a Fuel Pump upgrade on a 5th should should consider buying an inline pump instead.