I started the engine for the third time today and noticed a drop in fuel pressure from 23 to 14psi then the engine ran rough and died. I started again and it did the same thing. I unhooked every line in order from the firewall to the spider and turn the boost pump on and pumped fuel into a bucket and everything looked good. Started it again and it ran for about a min before dropping to 14psi again. I turned the boost pump on and fuel pressure went to 27psi and the eng ran fine. I tried a bunch of rpms and turned the pump off and every time pressure dropped. I checked the filter for the boost pump and there was two very small shavings, which I cleaned out. I ran it up again and leaned it out but it still wanted to die without the boost pump. This is a brand new experimental engine from lycoming. Can it be anything other than the eng driven pump? Please let me know, thanks
Nick
Nick