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Post by phatboy on Apr 14, 2016 0:42:36 GMT -5
I just changed out my petcock, clear fuel lines, and both the fuel filter in the petcock, and a clear inline fuel filter, the kind with the sintered bronze screen. I used (what I thought were) quality parts. So I put it all together yesterday, but it was raining so did not test ride until today. The scooter started up fine but died after two blocks.
In that two blocks, it completely drained the gas in the fuel line downstream of the fuel filter. The flow out of the new fuel filter was like a drop at a time, too slow to keep it running. Flow above the filter is fine, and it is installed in the right flow direction according to the arrow on it.
I have had problems in the past with debris in the fuel system but the gas in the lines and the filter looks totally clean, I don't see any debris at all. It could be clogged already, I suppose, but can a fuel filter really clog up instantly like that when the fuel otherwise looks clean, or do you think I just got a bad filter?
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Jonway Madness YY50QT-31 2014 (now made of more replacement parts than original)
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Post by username on Apr 14, 2016 2:21:31 GMT -5
you sure fuel flow above the filter is deffinately fine? it sounds to me like you got the hoses on the wrong way round on the pet cock valve (i've done it before) thought it was a bad valve and ordered a new one before realising.
a simple test would be to remove filter try blowing through it? if not a hose and the filter connected to it and run water through it see if it comes out at full flow obviously let it throughly dry before reinstalling, theyre not sophisticated peices of technology just a valve and a bit of catchment material, i would highly doubt the filter is your problem.
anyway you said you replaced your filter was the last one bad or just routine maintenance? you could install the old one as a test...
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Post by crawford on Apr 14, 2016 11:24:48 GMT -5
For a test jump out fuel filter
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Post by phatboy on Apr 14, 2016 13:28:36 GMT -5
The tube above the filter flows fine, new petcock is manual, for a motorcycle (on/off/reserve switch) I probably should have mentioned that  My old filter was 150 micron and it flowed fine, but I think it passed too much junk, I had stuff in my float bowl and the float needle would stick open. However the filter never clogged. I guess there could be lots of finer particles in my fuel but really could it both be invisible and clog so quickly that the bike won't run for more than a minute? |
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Post by powerzombie on Apr 14, 2016 19:08:06 GMT -5
Make sure your cap is venting.
Does it flow well below the filter?
Anyhow, if the filter fills up that fast, you'll have to drain and flush out your tank.
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Post by phatboy on Apr 15, 2016 15:59:26 GMT -5
Today I found the manual petcock was not all the way open, and although flow upstream of the filter was file, I think there was just enough of a restriction in the filter to limit the flow. When opened all the way it is not exactly free flowing through the filter, defintely there is a restriction, but so far flow looks adequate.
I did clean out the tank today anyway (swished out with new fuel and drained a few times, not sure what else I can really do), and installed the old 150 micron upstream as a pre filter, we will see how that goes. Next step is to clean the carb completely, and hope I am done with the fuel system for a while.
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Post by mftic on Apr 15, 2016 16:21:14 GMT -5
Mine does that low flow thing through the filter also. Causes an air bubble at the top of it. Maybe it's supposed to be like that? Don't like the looks of it but has never caused a problem.
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Post by rockynv on Apr 16, 2016 0:50:42 GMT -5
Ethanol can contain algae which can almost instantaneously clog a fuel filter. Some will use a filtered funnel when fueling their bikes if the stations in their area have a problem with algae contamination of their ethanol.
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Post by powerzombie on Apr 16, 2016 4:27:45 GMT -5
Ethanol can contain algae which can almost instantaneously clog a fuel filter. Some will use a filtered funnel when fueling their bikes if the stations in their area have a problem with algae contamination of their ethanol. Wouldn't that cause everyone who fueled up there to have their vehicles crap out soon after leaving the pump? |
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Post by rockynv on Apr 16, 2016 7:53:33 GMT -5
Ethanol can contain algae which can almost instantaneously clog a fuel filter. Some will use a filtered funnel when fueling their bikes if the stations in their area have a problem with algae contamination of their ethanol. Wouldn't that cause everyone who fueled up there to have their vehicles crap out soon after leaving the pump? Appears to be worse for those with the tiny sintered bronze filters instead of the screens or pleated paper ones. We use to have to remove the sintered bronze filters from the Rochesters in the old GM vehicles and change to a larger in-line pleated paper filter where contaminated fuel was a problem back in the day. Compared with the in-tank 70 psi fuel injection on most modern vehicles, large fuel sock pre-filters and rather enormous in-line pleated cartridge filters the small scooter with a carb and at best a 1 psi vacuum powered fuel pump could probably end up being like a canary to a coal miner when a bronze filter is installed in it. The canary would die first warning the miners it was time to run and escape from the gas leak. |
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