OK, to start things off, I have a 1990 Jeep Wrangler YJ with an inline 6. The carb isn't the original, according to the guy I bought it from. In the Chilton's repair manual, it looks like there's only one metering screw on the carb, the one that's in my Jeep has two metering screws on the front. According to this guy, the carb was rebuilt before it was installed.
When I try to start it after it's been sitting a while (2 or 3 hours), the engine will crank over, but it takes about 45 seconds for the thing to catch and actually start. My friend tells me that it's due to the gas following the line back into the tank, which makes sense to me, my 79 Firebird Formula had the same problem. Does anyone have any suggestions on how to diagnose/reslove this problem? Any help would be much appreciated.