When my car (240z, standard carbs) is warm, it starts straight up. I found that if I left it for a week or so, int takes a lot of turning over to get it started. Once started, no problems. I wondered if the fuel was evaporating/leaking somehow, so I left it for standing for a couple of weeks. Then I took off the fuel feed to the rear carb . I would have expected a bit of residual fuel, but nothing came out at all. So I removed the carb, took the top off the float chamber and found that empty too. I appreciate that the float chamber is vented to the air filter backplate and therefore it's not a sealed container as such, and if the fuel actually can evaporate then it makes sense that the fuel in the feed pipe is going to go the same way when the float drops, opening the needle valve and letting the fuel from the pipe run into the float chamber. Question is....is this fuel loss to be expected, and if so is there any way to prevent it, aside from fitting an electric fuel pump? (which I don't really want to do) Thanks!