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Carburetor Problem - would you believe that chunks of the paper fuel filter element were in the...

Posted By Daniel Jessup 6 Years Ago
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Carburetor Problem - would you believe that chunks of the paper fuel...

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Daniel Jessup
Problem Posted 6 Years Ago
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After dealing with rough idle issues on my Edelbrock 1404, manual choke, 500 cfm carburetor installed on my 292 (bored to 301), I decided to pull it to see what was going on. Before I did so, I pulled a spark plug - yep, fuel-fouled.
http://forums.y-blocksforever.com/uploads/images/4e8327a1-2156-46fa-aa19-0fe7.jpg
Since I could not get the idle mixture screws to respond, nor the idle set screw to cooperate, I hooked up a vacuum gauge - it showed 19-20 and vibration between the two measurements. Of course, with idle rough this was an easy assessment. I also could not get any signal from the timed advance port on the carburetor. Off the carburetor came, and I am glad I did!
 http://forums.y-blocksforever.com/uploads/images/e0556757-ba91-4933-8bac-cd91.jpg
What resembles rust in the photo above was actually a very smooth film of wet good. Very odd stuff. Check out these butterflies:
http://forums.y-blocksforever.com/uploads/images/4d1fbc89-3356-473f-806c-39b4.jpg
Not quite sure what all of that was about since my air filter is basically new, the cleaner seals well, and I do not leave the carb without the cleaner installed. The real kicker were the fuel bowls. In addition to sediment, there were some "floaties" in there, and also some material stuck to the inlet screens.
http://forums.y-blocksforever.com/uploads/images/d4e943e6-b79e-4435-bff6-e927.jpg
After breaking out the magnifying glass, it became readily apparent that the material was indeed paper product from the fuel filter element. I disassembled both filters that I had on the car that had paper elements: the canister at the fuel pump and the inline filter. The fuel pump was fine, but the inline was falling apart at the edge nears the outlet of the filter housing. Yuck.

An ultrasonic cleaner worked well with Awesome cleaner, Vinegar, and water. What a difference.
http://forums.y-blocksforever.com/uploads/images/b3af0a49-ef5c-44e1-90d8-31de.jpg
http://forums.y-blocksforever.com/uploads/images/f22502ad-b0f3-4296-b05e-d90e.jpghttp://forums.y-blocksforever.com/uploads/images/7ac48fac-e02a-4639-ae0a-9337.jpg
A couple odd things: I did not see much in the way of ethanol deposits. As I recall, I did run at least one tank with ethanol, but the other tanks of fuel I did use Eastwood's ethanol treatment. Seems like that made a difference. Also, the passenger side metering rod was literally stuck in the jet with this rusty looking goo when I disassembled the top plate. The spring did not pop-it-up like normal.

Does anyone know what causes that rusty looking film?

Daniel Jessup

Lancaster, California

aka "The Hot Rod Reverend" w00t
check out the 1955 Ford Fairlane build at www.hotrodreverend.com





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