1979 Suzuki GS 750 E petcock and carburetor pictures

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You will likely have to rejet the carburetors due to the more open intake

!980 gS750l HAS A SCREW HEAD TYPE PETCOCK. IT LOOKS LIKE THE LEVEL IS MISSING BUT THAT IS THE STOCK PIECE. TWO SCREWS HOLD THE PETCOCK TO THE TANK. REMOVE THOSE AND THE PETCOCK BASICALLY FALLS OFF. YOUR NEW ONE SHOUILD HAVE AT LEAST THE SAME BASE WITH THE SAME DISTANCE BETWEEN THE SCREW HOLES.

Theres a set on ebay right now bud
http://cgi.ebay.com/ebaymotors/77-SUZUKI-GS-750-GS750-GOOD-SET-OF-CARBURETORS-CARBS_W0QQcmdZViewItemQQhashZitem3a59c70406QQitemZ250614318086QQptZMotorcyclesQ5fPartsQ5fAccessories

Item number 250614318086

Domi Racer, SUDCO Vintage

The GS bikes do have a fuel pump that is part of the petcock. This pump runs off of a vacuum line from the carbs. The carb bank is also made to run with the air-box in place. It will also not run right without the stock exhaust system in place. The engine would have to be re-jetted to properly run with a different exhaust system.
The engine will never run right without the air-box unless you get a vacuum gauge and properly tune the carb bank without it. Anyway, to fix your fuel pump problem, you may be able to install just the pump somehow, in between your tank and carburetor assembly.
You'll have to change several things to make this engine work as a go cart engine and be dependable.