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Old 06-29-2013, 01:00 PM
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Perplexing fuel system question


This isnt really a hot rodding question, but you guys seem to be among the most knowledgeable on the internet, so I figured I would post this here. I have a Honda 8hp gas motor from the 70s that I picked up at a yard sale, rehabbed, and am now using to power an air compressor. The gas tank has a little stopcock under with a clear plastic bowl on it that is supposed to collect any sediment from the tank. I had to buy a new stopcock/bowl assembly as part of my rehabbing to get it running. The bowl has a little flange on it that allows it to be held onto the stopcock by a threaded ring. Not sure if I am describing this well enough. See the below exploded parts diagram (part #2).

The problem I am having is that the little bowl appears to be shrinking!! When I first got the part, it worked fine for awhile, then one day when I was about to run the motor, the bowl just fell out because the flange was too small. I figured maybe it had been just barely the right size and had stayed in there by luck, and I ground down a brass washer and made an adapter to hold it in there. Fast forward a year, and the exact same thing happened again. The bowl fell out of my adapter ring!! Is it possible that the ethanol in the new gas is eating away at the plastic? Or is something else causing the bowl to shrink?

If I have not described this well enough, feel free to ask me questions. Thanks for your help.

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Old 06-29-2013, 02:04 PM
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Tricity power equipment has a Honda mechanic that knows some of the older stuff.(bc) if you dont get an answer soon I will ask Gary after the long week end
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Old 06-29-2013, 02:05 PM
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Originally Posted by eocoolj View Post
Is it possible that the ethanol in the new gas is eating away at the plastic?
You have nailed it in my opinion.
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Old 06-29-2013, 02:47 PM
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Yes it is shrinking

Hi all

You are on the right track.In the 80`s when gasahall come out I was changing fuel line`s and rebuilding carbs like there was no tomorrow.That is why it disapearded in 2 months.In the 90`s they played the game with 45 cetane for diesel and destroyed many injection pumps.And now the fuel has all kinds of junk in it.They the power`s that be want cars to be changed as much as possible.So that the roads only have new car`s on them.The kind that they can control. When was the last time you saw a gas sation have it`s tanks pumped clean of water.

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Yes, the bowl and the rubber seal on the gas tank filler cap. Ate up a couple of them on my tractor/mower.
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Old 06-29-2013, 08:54 PM
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If the bowl is plastic , it will shrink...decay.
Part number 1 also will crap the bed due to ethanol.
Fact is stranger than Fiction
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