So, my honey was coming up for a couple of days, and I was making certain that everything was running well (enough) on the boat for a day or two cruise.* Took the boat out for several short runs, & all was working well.
I use the forward fuel tank as a day tank, since it has a sight guage and I can get a pretty good feel for fuel burn.* It had been down about a third from full, but I noticed that it was full again.* Ooops - left the fuel valve open from one of the aft tanks - not a problem, just turn off the valve and we'll go cruise with a full forward tank.*
In my cleverness, however, I apparently turned off the forward tank, too.
Fired up "the girls" on the appointed morning for a cruise around Fidalgo Island (through Swinomish channel & Deception Pass).* Got out of the marina and into open water when the stbd engine started to surge.* It carried on like that for about a minute, and then went silent.
I went below to try to restart it (figuring on some air in*the system).* Got it to light off briefly, then stall again, and then the port engine started surging...
As expected, it went TU about a minute later.* So there we are drifting silently.* My bride was NOT amused.* I figured that at the very least I'd get some value out of the BoatUS towing policy.
Pulled up the engine hatches so that I could turn on the electric fuel pump that's installed to prime the fuel filters.* Glanced at the vacuum guages on the fuel filters ... about 25"!!!* Holy crap - both fuel filters are totally clogged on ten minutes of running???!?!?!
Wait a minute... check the forward tank fuel valve. It's OFF!!* I do NOT remember doing that, but apparently must have done so when I discovered the full forward tank.* I subsequently turned off the aft tank, too.
A few seconds of cranking at WOT, and the girls are both rumbling happily again.* Very thankful that I had put in the vacuum guages on the Racor 1000s, as I don't know how long it would have taken to have checked the valves - my first instinct would be "no way we could have run for that long with the valves closed, so no need to check."
And thankfully, that was the only "aw****" moment of the day!