jay_merrill
Vice Admiral
- Joined
- Dec 5, 2007
- Messages
- 5,653
Not long ago, I found a curious bit of debris in one of the carbs on my 1972, 65hp Johnson. It was white and looked like a piece of plastic. Also, there was a video link in one of the posts here not too long ago, which gave a demo on rebuilding an OMC carb. Strangely enough, during that rebuild the mechanic found the same thing - a white piece of debris in the carb.
Since both the piece found in the video lesson, and the piece that I found in my carb, were too large to pass through the screen that is in an OMC fuel pump, I am somewhat perplexed as to where these pieces could have come from. My immediate thought was a defective fuel pump. On my motor, however, I am not sure because it works fine and I have had no problems since then.
Regardless of what the answer to this mystery might be, the incident has caused me to install an inline fuel filter between my fuel pump and my carbs. The filter is a Marpac with brass elbows from one of the "bigbox" home improvement stores. The threads on the Marpac and the elbow didn't match but I was able to use a tap & die set to match them up. I also used some gasket sealer on the threads of the elbow to make sure that I didn't end up with any leaks. I used the plastic nipples that came with the Marpac, in the elbows too.
The photos below show the modified filter and the installation on my motor. Hopefully, this idea is worthy of sharing and may prevent others from getting "mysterious" bits of junk in their carbs.
Since both the piece found in the video lesson, and the piece that I found in my carb, were too large to pass through the screen that is in an OMC fuel pump, I am somewhat perplexed as to where these pieces could have come from. My immediate thought was a defective fuel pump. On my motor, however, I am not sure because it works fine and I have had no problems since then.
Regardless of what the answer to this mystery might be, the incident has caused me to install an inline fuel filter between my fuel pump and my carbs. The filter is a Marpac with brass elbows from one of the "bigbox" home improvement stores. The threads on the Marpac and the elbow didn't match but I was able to use a tap & die set to match them up. I also used some gasket sealer on the threads of the elbow to make sure that I didn't end up with any leaks. I used the plastic nipples that came with the Marpac, in the elbows too.
The photos below show the modified filter and the installation on my motor. Hopefully, this idea is worthy of sharing and may prevent others from getting "mysterious" bits of junk in their carbs.
