Quote:
Originally Posted by TMAllison
Sounds like a leak at the pre-filter o-ring (big one). Has separate part number and doesnt come wiht the pre-filter.
The fuel line from the fuel thermo (in the head) to the top of the pre-filter should drain back at shutdown. Is normal.
Air in the line at the bottom of the pre-filter filter housing is usually the big o-ring. If new, check to make certain it is sealed up good.
Park nose down in mean time to help wiht hard starts.
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The pre-filter has a new O ring on it, checked it to make sure it's seated properly and sealed. There is air in the line at the bottom of the pre-filter housing, but that makes sense since there's also air in the line at the top of the pre-filter housing. Air in = air out. The air must be entering prior to reaching the pre-filter.
Just to clarify, when I say there's air in the line, what I mean is there's a steady stream of large, fast-moving, bubbles visible when the engine is running.