Originally Posted by ack
Lack of fuel might possibly be caused by a plugged fuel filter or a fuel pump installed in the engine bay sucking on a leaky fuel line. If foats = floats, it is possible that the float valve is full of junk. Then again, you said that it was a freshly-rebuilt Weber from Petroworks... That might not be the problem.
If I read the OP correctly, it has a new rebuilt carb on it. If he is dealing with smog, it is probably not a Weber, but a stock Hitachi.
I have a freshly rebuilt Hitachi carb on mine. I believe a combination of bad gas and old lines has caused me some idle issues.
Reinstalling an old line on a fitting can cause bits of rubber to break loose and clog carb passages.
I put a new line from the fuel pump to the carb with a fuel filter on it, and plan to replace all the lines. I then pulled the drain plugs and blew the jets out with carb cleaner and blew the pilot jet out as well. I also sprayed carb cleaner in all the available ports inside the throttle body and the fuel inlet and bowl vent. After putting it back together, it still did not idle, but after a few hundred miles it finally started idling.
I recently lost the idle again, and just sprayed the pilot jet out with carb cleaner. That did not fix it right away, but after I did a couple of acceleration to redline starts the idle came back.(I had tried that previous to blowing the pilot jet out, but it did not help.)
Check out Ack's FAQ Suzuki Sidekick and Geo Tracker 4X4 offroading information
There are Suzuki Factory Service Manuals located there, along with a ton of other stuff that can lead you in the right direction. For the carb, make sure all the vacuum lines and celectrical connections are routed properly and then run through the checks to make sure everything is working. I've done that(several times) and it has let me narrow the likely problems I have had down to trash in the carb.
My experiences with a clogged fuel filter or bad fuel pumps have usually been that the engine will run fine up to a certain load, and then fall on its face(lose power) at higher loads. Sometimes it will only happen in lower gears as the float bowl has enough gas in it to handle the short load times in lower gears, but then runs low when kept at high loads.
Did it run good with the Weber on it? If so, then that would seem to eliminate the filter and pump as a problem.