I have a 2000 lowrider with a mikuni carb on it. I took the petcock fuel filter out to replace it, followed clymer manual instructions, and replaced the filter. Put the fuel valve back on, went to start up and it just tried to start but sounded like it had no fuel to fire up. I drained the tank, took the pet **** back off and turned it from OFF to ON and RESERVE and the fuel came out of it at a normal rate. But when I hook the fuel line back up same problem. I have bypassed teh vacuum line and tried it that way and the stock way, still trying to start but not getting gas to the carb. Any ideas? Thanks for all help in advance