Oil & Fuel Hey, why's this fuel tube like this?

[pequeajim]

I want to replace my fuel filter and tubing. I noticed that my tube comes out of the tank and then takes a big trip down to the bottom of the compartment and then back up to the engine?

Is there a reason for this? Can I just run the tube pretty much straight to the carb?

 

[BobRip]

I want to replace my fuel filter and tubing. I noticed that my tube comes out of the tank and then takes a big trip down to the bottom of the compartment and then back up to the engine?

Is there a reason for this? Can I just run the tube pretty much straight to the carb?

I ran mine pretty straight.Yours may be different from mine. Are there in hot items to avoid?

 

[pequeajim]

Hot items, no, not really. It is pretty easy to stay away from the muffler. This tube ran way down to the bottom of the compartment and under some of the hydraulic hoses?

I am going to run it somewhat straight with a little dip to give the muffler plenty of clearance.

 

[SnowRidge]

Mine came with a short line directly to the filter, then an even shorter line to the fuel pump.

 

[Marks481]

I suspect that they made it drop down to the bottom to keep it away from the exhaust manifold and the hot air coming out of the forward end of the engine. Mine drops to the bottom of the engine compartment as well.

There have been a number of complaints about cavitating fuel supply, although I suspect mounting the fuel pump immediately inboard of the muffler might be more of the cuplret then the fuel line.

If you do modify it, I would recommend replacing it with a nice thick rubber hose to protect it from heat a little better.

Speaking of mufflers, have I complained about that and the poorly designed exhaust manifold in the last 5 minutes...

 

[pequeajim]

I changed it out tonight and made the line a bit shorter. It still loops down a little, but no where near as much. I also used heavy duty black gas line and put a new clear gas filter in with a washable screen.

Tractor is running much better.

 

[ldabe]

I changed it out tonight and made the line a bit shorter. It still loops down a little, but no where near as much. I also used heavy duty black gas line and put a new clear gas filter in with a washable screen.

Tractor is running much better.

How was it running previously? Not starting? Stalling? Chugging?

 

[pequeajim]

How was it running previously? Not starting? Stalling? Chugging?

It would cut grass for about 20-30 minutes and then start to die. I thought it felt a lot like the vapor lock that people had described on here. I'm not sure, but it runns really well now. I think the combination of changing the fuel filter and rerouting the line helped.

 

[SnowRidge]

I had the same problem, with symptoms just as you described. I traced it to a partially blocked vent hole in the gas cap. On a hot day after running awhile, the engine would pull a slight vacuum in the tank. That caused the hot gasoline to start boiling off (bubbling) right at the filter intake. Blowing the gas cap vent hole out with 125 PSI air takes care of it. It's happened a couple of times.