Everywhere I go I see it. A cutaway diagram of the Travco that slowly rotates in my head as it zooms into the gas tank in the rear and then follows the gas down the line toward the front to the right of the engine, drawn up into the fuel pump, pushed out and up, under the alternator to the top of the engine, through the fuel filter and into the carburetor where it mixes with air and ignites with a spark. This view invades everything I do. I see it sitting at stoplights, a similar path of electricity out of the breaker, up the light pole and to the switch which sends it to the top lens which happens to be red[^1]. I see it doing the dishes. I understand it and yet I cannot make it work. It has to be the fuel pump. I have spark, I have compression the missing ingredient in the basic trifecta of the internal combustion engine is fuel. See it and understanding it are different than actually solving the problem, making it work. I continue to fail. Stymied by time constraints, other commitments, weather. Days pass. Still the bus doesn't start. I get sullen. My wife thinks I'm mad all the time. I'm not. I'm thinking about the engine, I can't get it out of my head. It reminds me of the first time I tried to write some code. Food, sleep, these things seem unimportant when I have a problem that needs solving stuck in my head. I tend to get obsessed about things. Even when I don't want to. It's one of the reasons I don't do much programming anymore. I never let things go until I solve the problem to my satisfaction. Of course breaking a web server doesn't cost much relative to damaging an engine so with the bus the stakes are much higher, the sullen thinking phases I pass through is correspondingly more sullen and requires more concentration.