Originally Posted by
Chris Nicastro
That’s basically the same set up my friend and I are doing on the TRC FW-190 with the 150. Do you think the pump is necessary from your experience?
my first two engines were evolution 7-160cc engines and I ran both without pumps. In order to run the engines without pumps, I had to set both needles a full turn or more out beyond the factory settings to run without being lean. One of the two evolution 7-160cc had a mechanical failure after 5 years of use, something wrong with the cams. I replaced that engine with the UMS 7-160 and added a pump. With the pump installed, both needles were set a bit leaner from factory settings. Then I mounted the 5-125 without a pump on the FW190 and found that I couldn’t get the needles out far enough to get the engine to run rich, so I added the pump and it fixed the problem. The tank on the 190 is close to the carb , within 4”.
I’m running a pump on all of them including the newly installed 5-180. The pumps help in a tremendous way