Re: 80 merc 1984 dies out after 1/2 throttle

[jerry-ahrens]

I’ve run into the collapsed fuel line also, many many times. If it has the Quicksilver [Mercury] hose with the red print on it, throw it away because it will go bad. Another way to identify this older generation fuel line is that it’s very flexible, and easily slides over a fitting or barb. The new Merc hose has blue print on it, and is much less flexible than the earlier generation hose. Both the old and current hose are silver/grey in color.
Hopefully you aren’t using the Sierra hose that’s white in color. Toss it out too, as I’ve found it’s even worse.