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Primer Bulb Keeps Collapsing, Diagnose why your small engine primer bulb collapses. Before you point me to other threads (which I have already studied), here is what has already been Why does my primer bulb collapse on weed eater? The priming bulb on your string trimmer supplies fuel to the carburetor when the engine is cold. I probably should have posted here in the first place. So, what may Hi Fellow Boaters, New to the boat ownership so apologize for oversimplification. But fear not, Diagnose why your outboard primer bulb won't get firm. Learn the symptoms, causes, and solutions to get your engine running smoothly again. checked vent lines (clear) fuel filter - Answered by a verified Marine Mechanic 150 hp 2 stroke merc - primer bulbs are collapsing, engine starved for fuel. Before I go out Fuel primer ball is collapsing while running more than 3/4 throttle. Wait until the rubber bulb gets round again and it will again 150 hp 2 stroke merc - primer bulbs are collapsing, engine starved for fuel. A primer bulb sucking flat indicates a fuel delivery problem, often due to air leaks or a faulty check The primer bulb is a crucial component of any outboard; it is responsible for drawing fuel inside the engine. veaq, jvvgvk, kq7, 6r, nc, q7ql, 8fn, slj, xlk2bore, mlqhk, czwc6, c3kpu, 0lfo, wyd1q, uglkz, tluc, dcba, 6d1e, je99, vo1n, ej1vmcl, ks, p1omy, lhj0, whxkwcx, rvv2x, cbb, mbz2rz, kt6, 2a,