I spoke to MSD today and the tech suggested that adding the MSD 6 plus may have leaned out the mixture from a 6x hotter spark, so the car might run differently.
When y'all added yours, did you need to retune because the engine was running differently?
I want the car to look as original as possible and I was finding it was spitting using just the mechanical fuel pump. Over the years the people I've respected have all told me to get rid of it.
This week I went down and purchased a new metal main fuel line, and added a Racor 120 between the tank and the mechanical pump. There are three filter sizes, and the tech at RACOR said use the 10 micron. I saw a bit of rust, not much, but there anyway, from the tank and was using an extra inline filter until I got around to installing the RACOR. I also added a low pressure electric pump 1-4 pounds next to my Racor. The diaphragm neoprene kit from Geoffrey Ohland for my FISPA FRB111 is installed, as well as Cavis green tubing so the engine bay looks original. The car seems to idle better with the electric pump in back, along with the mechanical. I installed the electric pump on a very thick piece of horse stall mat and it is neat, cheap and quiet. With the relatively large Racor I can see any contamination in the bottom bowl and can drain the bowl from time to time. I like the idea of a filter before the mechanical pump. I understand why Alfa put the FISPA after the mechanical pump because it also serves as a pressure regulator. I never liked the idea of stuff from the fuel tank having a chance to get into the mechanical pump.
Last edited by Dr.G; 03-27-2013 at 08:33 AM.