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Some theories that I have heard thus far:
Internal failure. But the default position is closed, so short of the spring that keeps it closed failing, what else could cause this?
Debris preventing injector from closing
Filter at fuel pump degrading, allowing debris through. Any evidence?
The injectors have small filters in them, as most auto injectors do. Some say yes, others say no.
Fuel line or other component corrosion/particles from wear. Does a failing fuel pump create debris?
Material incompatibility with Ethanol?
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