I just took apart the valve inside of my toilet to fix a crack in the floater. It's a Fluidmaster 300:

Fluidmaster 300

When I put the thing back together and turn the water back on, no water comes out of the refill tube. Instead, it squirts out of the top of the red cap where the black floater connects.

Underneath that red cap is a rubber diaphram, which i've pulled out and inspected. It's in good shape. it has a little nipple in the middle where a tiny stream of water can come out, and water is coming out of that, but not the refill tube. Anyone know what's going on here?

Edit: I found a little pin in the bottom of the toilet. Is this supposed to go in the nipple of the seal? Looking at the valve, I can't even understand how the arm raising could possibly shut anything off! I feel like I just discovered a glitch in the matrix or something.

  • I'm not familiar with this particular fill valve, but it looks like you may have missed something when reassembling the valve. The pin may be a critical missing piece, or a red herring! One nice thing about some fluidmaster valves is that they're super easy to replace -- you can just move a ring and pop the valve parts off the base tube, and pop on a new one quickly without needing to unscrew the base. – Shimon Rura Jan 27 '16 at 21:30
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    This is a good moment to realize that you when you disassemble something take plenty of pictures so that you can re-assemble it properly. – ArchonOSX Mar 3 '16 at 8:39

Save yourself a headache and just remove this damaged unit and fit a Fluidmaster 400A. -Less than $15 and 30 minute's work.

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The pin should be your problem. You're right, it does go behind the diaphragm, See this video at 58-seconds & 1:30 for an example, & inside the center of the cap.

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