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On a large radial engine, priming may be done without any dedicated line to a particular cylinder. It used to be standard practice in the winter time to flood the supercharger while cranking until fuel ran out of the drain, with a five gallon bucket below to catch the fuel. Apply spark, begin advancing the mixture and cracking the throttle; the priming was ...


In addition to John K, it only takes one or two cylinders to fire before the engine will start. Just like when pull starting a lawn mower, once the cylinder fires once it will almost always start, similar principle here, while priming all cylinders would not hinder starting, if it only takes one of them to fire it is pointless to prime all of them.


The airplane maker will not normally install any more primer lines than necessary. In warm environments it's not usually necessary to prime more than one cylinder, so you will see airplanes operated in the southern US with single primer lines more often than in the northern US or Canada. My old '68 Cardinal only had a single primer port because it had been ...


Without a cockpit indication (bypass light, annunciator, etc), then one has no way of knowing if a fuel filter is the problem, or if there is some other cause. If one has insufficient fuel flow, then one has insufficient fuel flow; one can't fix the filter issue in flight, or address it other than perhaps to switch tanks, depending on the system, filter, ...

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