Identifying fuel line to carb...

[jamieofansa]

1982 GS650, inline 4, followed Clymer manual to take tank and carbs off for cleaning. Wrestled carbs back in and not sure what is my fuel hose to the carbs. I have a hose coming out of the petcock, and then another hose out of the carbs that I'm pretty sure via smell and assessment is the fuel line. The presence of markings and a worm drive make me believe that's the fuel line connected to the carbs and not that I pulled the fuel line off with the tank and have to hunt a nipple down at the carbs.



I just don't understand why I'd have a second hose in that tank but I'm 90% sure was to drain the fuel and I just forgot I put it on the petcock. Just looking to confirm before I hook my petcock up to a wrong hose like a dummy.

[Big T]

The hose with the clamp is fuel, and it goes on the large connection on the petcock
The hose on the left, connected to carb #2, is the vacuum and goes to the small connection on the petcock

[phydeauxmutt]

The presence of that type of clamp also tells me that it's the wrong TYPE of fuel line.

On the carbs, there is a T between carbs 1&2. There is another T between carbs 3&4. Those are VENT lines that get routed back, over the airbox into the still air under the seat. (I can see one of them disappearing off the right side of your picture.) You might have a rectangular hoop on top of the air filter that will hold those two hoses.

There is another T between carbs 2&3. That is the FUEL line, it gets routed to the larger barb on the petcock. There is a barb on carb #2. That hose (that is disappearing over the valve cover in your picture) should go to the smaller barb on the petcock.

If your bike has a fuel gauge, there will be another rubber hose on the fuel tank. That one just gets routed back, over the airbox and down below the engine. It is there just in case the gasket around the sending unit leaks. It does not get connected to anything at the lower end.

[jamieofansa]

What is the correct hose type? I did not install it, the bike is new to me, but it's supple and looks like the kind I would be given at a standard four wheeler parts store (AutoZone etc) for fuel line. I've seen much much more expensive clear and colored fuel lines from cycle gear which I assumed to be an ascetic choice.

[cowboyup3371]

What is the correct hose type? I did not install it, the bike is new to me, but it's supple and looks like the kind I would be given at a standard four wheeler parts store (AutoZone etc) for fuel line. I've seen much much more expensive clear and colored fuel lines from cycle gear which I assumed to be an ascetic choice.

The kind you get from Autozone will be slightly too big hence the need for that clamp. The correct stuff from Suzuki fits snugly without any mechanical help.

[Redman]

Jamie, Welcome to THeGSR.

All what has been said above is what I was gonna say.

One clue to the hose not beeing correct is the "SAE" you see printed on the tube. Society of Automotive Enginneers, is specifically American, back from the day when didnt think to say was American.
AS long as is rated for gas service, it will be okay, just need the hose clamps. If try to get a Suzuki stock hose for that, it comes in bulk length package, loke a meter long, and as such is expensive. Same for thing for such as the vaccum line and the vent lines. Maybe can find a place that supplys metric sizes if need more.

[Redman]

two tricks about removing tank (not in manaul):
-after removing bolts from back of tank, prop the back end up some so give some clearnece to get fingers in under the tank to work on those lines.
- immeadailty after removing tank, take off the round rubber cushions from the frame mounting points, and store them somewhere with other parts. Do this before they fall off later and roll to some hiding place so cant be found with hours of searching.

[ajh]

your fuel hose looks quite long although it might be just the pic but as a word of warning, I had fuel starvation problems with a long hose first kinking and then I suspect rising high under the tank causing air locks.

[jamieofansa]

Hi folks,

I got the carbs and tank back on and working. I didn't want to take the carbs out again to replace a hose that works but after a lazy oopsies (put a tank that had re-rusted on) I'm gonna have them off again. Based on looseness I suspect this line is 5/16" and not 1/4" ID so I'll try to get the tighter stuff on.

[salty_monk]

Z1 Enterprises and others stock the correct stuff.... You can replace the line with the carbs in place but it's not easy.

[bonanzadave]

It needs to be 7mm