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Engine basics => Engine set up tips => Topic started by: Ron Duly on June 02, 2025, 06:51:56 PM
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I am looking for an in-line one way valve for 3/32" fuel line. I need it in a pressure line to prevent flooding. I found a plastic valve for aquariums but don't know if it will hold up to nitro and methanol. Any idea where I can find one? Thanks
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Two suggestions...
1. Make one. 1/16"steel balls are available from McMaster-Carr. Some brass rod and a bit of machining.
2. All of the F2C vendors who sell fuel tanks with multi-function valves use a ball check in the exhaust prime line. These can be purchased separately and will work as a check valve in the pressure line.
Regards,
Bill
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i have one of those
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Bob, good buddy, best friend and helper of needy pilots, would you like to be my HERO and sell me one? Just one..... for now. Please! Pretty PLEASE!
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Bob, good buddy, best friend and helper of needy pilots, would you like to be my HERO and sell me one? Just one..... for now. Please! Pretty PLEASE!
Doesn't Fourmost or Foremost Products offer a check valve? I just can't say for sure who the manufacturer was but I have purchased one before at the local hobby shop. It's a plastic piece and it did seem to work. It's white on one end and red on the other. The same company makes other small fittings for fuel lines.
Type at you later,
Dan McEntee
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Doubt it will fit OP 3/32" fuel line being the barbs are .175"
Doesn't Fourmost or Foremost Products offer a check valve? I just can't say for sure who the manufacturer was but I have purchased one before at the local hobby shop. It's a plastic piece and it did seem to work. It's white on one end and red on the other. The same company makes other small fittings for fuel lines.
Type at you later,
Dan McEntee
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Dave, you are correct, the Fourmost valve would require a larger fuel line which I don't have room for.
Bob, you are my HERO. He came through with what I need. Thanks to all for your suggestions. Ron
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Ron, what are you building that needs a pressure line ball check?
Bill
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Need more info (what engine). 3/32 OD fuel line is some small line. Only thing you could get in there is 1/2a check valve made by KK way back when if you can find one new. If it's a bigger engine that size won't let enough pressure through. Also, a check valve like that has to be flushed clean with solvent after each days use or it will be ruined with dry oil. They don't seal completely, they only minimize back flow so you need to break the pressure as soon as the engine shuts off. I don't believe the Foremost valves will take the beating of a pulse line imho.
MM :)
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Doubt it will fit OP 3/32" fuel line being the barbs are .175"
I know Ron got his problem solved, but if we are talking about typical medium fuel line that gets used for 75% or more of most of our applications, the Fourmost unit works with that size fuel line just fine. Just curios what the 3/32" dimension was, ID or OD of the fuel line being used? ID of medium fuel line varies from brand to brand and can be anywhere from 1/16" to 3/32". I finally found the one I have on hand and medium fuel line is what I used it with.
Type at you later,
Dan McEntee
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Some FF and maybe Combat guys use a check valve on one end of a surgical tubing tank. That way, they fill through the check valve and can bind the hose to the spraybar with copper wire. And I believe they use the Foremost unit. Ralph Cooney is a good guy, so I'd bet they work. y1 Steve
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Most of the check valves I have seen for models are arguably good enough to block fuel, but I would not trust one to block air (i.e. like a uniflow plug) completely.
Brett
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The intended use is for my Class 2 Navy Carrier model with an old school Rossi 65 engine and Johnson fuel metering system. Unless the engine fires right away, the fuel is pushed out of the rear venturi into the fuselage and out the bottom drain hole. I'd like to avoid a fire.
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And I'd really like not to be holding your honkin' plane by the fuselage with the engine running and the plane on fire and the guy with the flipping end trying to get out of the way....
The Divot McSlow