GX35 Return Hose The Road Fuel Comes Back

The fuel that reaches the carburetor has a road back. The GX35 return hose is that road. A black rubber hose bent into an S shape, the two ends in different bore sizes, each with a stepped fitting, and two small grip ribs on the middle of the body. One end meets the carburetor return port, the other goes into the tank, and the fuel the pump sent up but the engine did not use flows back down it. The product comes in three options: the hose with two clamps, the hose only, or the two clamps only, so you buy what is missing.

Why does a 4 stroke engine need a return line? A 4 stroke pushes fuel from the tank to the carburetor with a fuel pump. If there were only the way up and no way back, the pressure in the tank would run wild, the pump would keep pushing into a closed system, and the fittings would weep. The return hose lets the surplus flow home, the tank pressure stays steady, the pump does not strain, and the ports do not leak. A 2 stroke has no fuel pump and no return line, so do not look for this hose on one.

What are the two clamps for? The return hose stays on by clamps, gripped tight over the tank port and the return port. The clamps come in two sizes, one for each end of the hose. If your old clamps are broken, rusty or bent, take the option with clamps and replace everything at once; if only the hose is bad, take the hose alone; if the hose is fine and the clamps have gone soft, the two clamps are enough.

When does the hose go? Rubber that has hardened, crumbles when pinched or leaks at a crack, goes at once. A stepped fitting worn round, with the hose slipping out of the port, goes. Grip ribs broken, the hose twisting loose in the seat, goes. Clamps that have lost their bite only need new clamps.