Recently when my A&P was working on the front mag to fix what appeared to be a prob with the tach, he broke the protective coating that is around the fuel line near the mag. He went to lunch and came back an hour later and there was a pool of gas under the engine. He then traced it to a crached fuel line that was cracked for quite some time but the now broken plastic shroud kept the leak hidden while on the ground. However in flight it was sucking air which is why we had previously turned up the fuel pressure on that engine.
Suggest you check your hoses for a like problem.
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