Gs 550 fuel questions

[Joakim]

Hi everyone. This is my first post ever in this forum but I’ve been visiting it a lot for answers. I own a rebuilt gs 550 EZ from 1982.
i have a few questions about fuel. The bike runs fantastic. But it’s a bit thirsty I think. The air element in the air box has been removed and it has bigger main jets. 110. It is also fitted with a 4 into one exhaust from motad.

as I said it runs fantastic. Starts like it came from the factory yesterday and it’s a dream to ride.
can I expect this bike to be high on fuel consumption?

the bike also drips from the hose that is coming from the fuel sender unit under the tank. But only when I have a full tank. It stops when I get down to the reserve tank.

thank you!

[Rich82GS750TZ]

Welcome to the site. You’re going to want to create a signature to include your bike info. It’s in settings. Much appreciated.

With no filter, you could be sending debris into your carbs, but people run velocity stack so..... anyway, lots more air burns lots more fuel. Your mileage will suffer.

On the sending uni, there is a rubber (viton?) gasket that is supposed to keep that from leaking. The don’t last forever. It’s an easy repair, the sending unit comes out with a series of twists and turns. I have a video of it if you need it. The part can be had from your local dealer or wherever you like to buy OEM Suzuki parts. In fact looking at my video, there’s 2 rubber bits that should be replaced. Likely the full round one around the hole causing your leak.

https://youtube.com/shorts/qykSzCQLyYc?feature=share

[xkaes]

Last time I checked -- it's been a while -- I was getting over 50 MPG on mine. Your leak is addressed above, so I suspect that the other modifications are the cause of any lower MPG. Others here will have some good suggestions. What is your best guess as to your current MPG?

[Joakim]

I’m guessing around 20 mpg.
it doesn’t leak that much really. Small drips with a few seconds apart.

[cowboyup3371]

That's a lot as it shouldn't leak at all. I would suggest ensuring the dowty seals (washers with rubber inside to seal it off) are still on the screws that attach the petcock to the tank, the o-ring is good between the petcock and tank, and maybe replace the fuel line. You also don't say which hose it's dripping from so make sure the vacuum one is dry.

Also, this type of question should technically be in the Technical forums (carb/fuel/exhaust) where you'll likely get more folks looking at it.

[Joakim]

Thankyou guys! I’ll report back. But it still seems like a lot of fuel consumption. And it’s running so good. But I’ll try to throw an air filter in there and see if anything happens

[Rich82GS750TZ]

If you’re dripping gas, at all, I’d fix that before worrying about mileage.