New here with a few questions please

[Made2care]

Not familiar with this bike. Previous owner might have fiddled around on these lines. Are the fuel lines hooked up correctly?
bike is a 1980 Suzuki gs750

[uk gs nut]

In a word, NO. The pipe from the fuel level sender is just a drain down to below swing arm level. The small fitting on the rear of the tap/fuel cock is a vacuum pipe and connects to one of your carburettors. The other pipe is fuel feed to centre T on the carbs.

[Rich82GS750TZ]

You’re kidding, right? Sorry, no. Yes, someone certainly did some fiddling.

let’s start with bike year and model. It’s preferable to have that info in a signature. At least include/ edit your first post to have that info.

The hose connected to the fuel level sending unit (the circular fixture at the top of your pic on the inside of the gas tank) is a drain. It’s sole purpose is to drain fuel over the carbs to the rear of the engine case, down to the ground (away from the hot engine). It connects to nothing. The hope is that it never sees a drop of fuel, it is there just in case the fuel level sending unit gasket leaks.

That petcock doesn’t look OEM to me (don’t know what bike this is). Smaller nipple on the petcock should have a line going to a nipple on one of the carb bodies (front of # 2if CV carbs, back of # 3 if VM carbs.)

The larger nipple in the petcock should have a hose going to the fuel inlet between carbs 2 & 3.

Depending on year/ model, there are more vent and / or drain lines on the carbs that need to be properly connected and routed.

Many service manuals are found on BikeCliffs Website. And the top 10 Newbie Mistakes thread is a good place for you to start. Both are linked in my signature.

Welcome to the forum.

[rphillips]

That picture's got me really confused... nothing looks correct at all. I never remember seeing the plate for the vacuum nipple on the bottom, aren't they always on the back & that fuel nipple is on top... Nothing about that, by what I see in the picture is right. You got any other pictures??

[Made2care]

Bike is a 1980 Suzuki GS750. I actually have a 1985 Suzuki Madura 1200cc and remember some similarities of the fuel tank lines when restoring it. Thanks for the info , I think I have it figured out and will hopefully get the bike to run.
thanks again and will keep you posted.