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HomeRC & Power✈️Aircraft🚁HelicopterEngines Plugs Mufflers Fuel › YS91 check valve - is mine bad??
01-28-2007 01:51 PM  12 years ago
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hrosee

rrApprentice

Richardson, Texas

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YS91 check valve - is mine bad??
I just bought a used 90se and it has a YS 91st on it. I was putting new fuel line on it and thought I would try to blow through the check valve. No matter how hard I blow I cannot get air through it. A couple of time it ssemed to get a little through for a second. Is this normal? Should it be this hard to blow through?

Thanks for any info.
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01-28-2007 04:14 PM  12 years ago
ErichF (RIP)

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Sutton, NH

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Yeah they can be tough, if they haven't been used for awhile.

If you have a manual fuel pump, run some fuel through it with that to get out any old oil that may be sticking it. Then you should be able to blow through it. You can use it to make sure it checks flow in the other direction, as well...just don't go crazy with the pressure.

Erich
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01-28-2007 04:28 PM  12 years ago
Dr.Ben

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Richmond, VA, USA

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Take the valve apart, flush all its parts with alcohol, dry them all thoroughly, and then reassemble. THEN, try sucking through it versus blowing. The YS check valves are spring tensioned and are thus sometimes hard to blow through. In ten years I've never had one that actually permanently failed. They all responded well to simple cleaning.

Ben Minor
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01-28-2007 04:54 PM  12 years ago
hrosee

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Richardson, Texas

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Thanks Ben.

I cleaned it and sucked through the end that goes to the tank and I can draw air. I guess I just didn't understand how the valve worked.

I guess I can run the engine and after I stop it I can see if there is pressure in the tank. If so then I will know it's working.

Harold
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