Are you talking about the Gold Color cap just before the hose clamps?

Look further back. It is a pulsation dempner.
Buly


On Dec 31, 2007, at 8:46 PM, Bob Perkinson wrote:

Looks like it might be the end of the dip stick bent over.


-------------- Original message ----------------------
From: hoursaway1@comcast.net

If that is a factory Mazda fuel pulsation dampner (yellow plastic
end cover
photo 2) should be removed, prone to leaks, even in the cars.
David.  RV-6A
Rotary

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