Re: 1975 evinrude 9.9 fuel pump prob?
I am wondering why only 75 pounds compression? Oh well, at least it's the same on both. Now, I know this may seem odd, but beleive it of not, if you have a bad condensor, it will usuallty check good, and the engine will start, but once the engine is running the condensor will internally short intermittantly, and with each short, it burns the path open (fuses) and then works again but leaves carbon from the arcing which then causes another short, it becomes a viciouse cycle. This type of problem will come and go, and typically the key is pitted points, or points that arc while running, but you won't be able to see that with this engine as the flywheel covers the points.
I had a 2-stroke twin that wopuld drop a cylinder and run rough, then "heal" itself and work fine, sometimes for long periods of time. I had another engine that started and ran OK until you gave it some load, and then it would run OK, but when you let off it would rough idle and eventually die. Both engines had bad condensors as it turns out.
The local marina had many of the older 9.9/15 engines for their rental fishing boat fleet, and the OMC certified mechanic once took it upon himself to put new points and condensors (tune-up kits) in all of them over the winter. The following spring, they had almost all of them crap out on the water, as the new condensors all were defective and failed in a very short time. He put all the old condensors back in, and all was good again. Apparently when Mallory, and others moved their condensor manufacturing to Asia, they were not made the same way and are inferior to the USA ones. I can attest to the fact that when Yamaha quit using Japanese made Hitachi condensors for OEM replacement parts, we began having failures with the Taiwanese Hitachi condensors, and again, it was always after a tune up kit had been installed. Lesson here is use the old condensors unless they are bad. FYI, my 1975 9.9 has original points and condensors.
Yes this is also throwing a dart, but at this point, it's stuff like this that burns you because one would assume a new condensor/s would not fail, but they do!
) to be a part of your archives!
