My friend had a problem with a B18C1 he swapped into an EG Si a good while ago. The car just really stumbled and wouldn't pull. We though it was ignition or ECU because it seemed like the computer was just pulling a huge amount of timing out of the engine. Turns out, it was that hose. Something around the banjo bolt was just chokeing off the fuel and it wasn't running right. They fixed it somehow, I'm assuming swapped it for another one, probably a B-series one, and it ran fine after that. Seeya.