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Is air in the fuel filter ok in an outboard motor or is it a sign of another problem It's an '88 Merc 80 carburated and oil injected.?
Wiki User
∙ 12y ago
It's common for some air to appear at the top of a translucent plastic fuel filter. When you squeeze your primer bulb, this should change--squeezing the bulb will force more air into the filter at first, but then less and less will appear each time the gas level 'rebounds'. The carb on your engine does not draw from the very top of the filter; the feed for the fuel line outbound is usually deep inside than it looks.
New:
You have been given a good answer regarding a "visual, or "clear" fuel filter and yes as stated, there is usually some air trapped on the "up" or highest" point of the filter. But once running has been established, there should be no visible air bubbles seen traveling in the fuel in the fuel line. Now once again, there may still exist a bubble in the clear filter. In most cases the fuel lines are nontransparent. But even on Race boats when the engine is running sporadically, I will often install a short piece of clear line in the fuel line to see if the fuel pickup inside the fuel tank has developed a leak. Also the fittings on the fuel tank itself are mostly made of aluminum and these fittings are subject to leaking. Aluminum fittings (of this grade, not SAE or AN type) are not well suited to the vibrations associated with boating, as they are constructed of the cheap grades of aluminum.
Wiki User
∙ 12y ago
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