Topic: Fuel line routing

[KB02]

And here's a question for the pneumatisists of our group: What is the porper method of fuel line routing for these old bikes?

Here's why I am asking:
On my 76 750F (with Single petcock), I have installed two inline fule filters. I have the one line running down from the tank to the "T" fitting, through the hole on the carb plate (so that it doesn't interfere with the choke linkage) and from there, each line goes through a filter before going to the fuel inlets on the carbs. Everything is below the level of the bottom of the tank, but the filters (which are see-through) don't seem to fill up at all and gas is only trickling through them.

Right now I have the filters above the air intake, but where the fuel line goes through the hole in the carb plate, it is about mid line of the carbs so the fuel has to go down, then up, and then down again. Should I rout the fuel lines so that they are all down below the carbs, or should I just leave them as they are?

[ProTeal55]

When it comes to routing fuel lines on a non-injected bike, gravity is your "pump".
You have to look at your setup, and think about if fluid will be able to make it thru your bends/kinks without issue. I have had nothing but bad luck with installing fuel filters, but thats just me...

I recently re-did my fuel system, from petcock to the rubber hose. I was very careful to keep the system as short, and "free flowing" as possibile. After a few different setups, I came out with something that looks good, and keeps the motor happy with the expensive stuff (fuel)..

[jdpas29]

one filter between your gas tank and the carbs is plenty.  make sure the filter is turned the correct way.  there IS a correct way and sometimes the filters are NOT labeled.  in order to find out which way is correct, blow through each end.  the less restrictive direction is correct for fuel flow.

[KB02]

They are marked and I have them facing the right way. The reason I went with two is because I was having fuel starvation issues with the old fuel line I had (I couldn't get the bike up above 65mph). I replaced the line with something bigger and wasn't positive that the fuel filter I had was completely innocent in the starvation issue. I figured with two filters after the "T," the less chance of starvation (besides, they're small).

My only question is: Is my routing now going to be a problem, or would routing the fuel line under the carbs be effective?

[Gordon]

My only question is: Is my routing now going to be a problem, or would routing the fuel line under the carbs be effective?

Check out this thread.  http://www.sohc4.us/forums/index.php?topic=7009.15

There's a picture of my fuel lines routed down under the carbs and then back up to the fuel inlet.  Works great and makes for easy tank removal because all I have to do is pull the tubes off the filters and lift it off. 

[chung]

I run mine under and then up to the carbs, much easier to work on things. If it were air trapped it would stall. I have had them trap air after beige installed but just pulling the line for a quick purge fixed it.

[ProTeal55]

I have found after installing a new fuel system/lines to run the bike for about 10 min and see if
it runs outta fuel due to a bad/hard bend, incorrect filter install, etc.. You will hear a change in the sound of the motor the minute it is starved for fuel. Also a good idea to take it for a "shakedown" run around the neighborhood and see if the motor is happy with the new lines/setup before going on a actuall ride..

I say this becasue when I first bought the CB, I re-did the fuel lines before me and a few friends went for a ride. It was 1/2 ass work, and I was rushed. I was going thru an intersection and the bike dies (due to lack of fuel) and I almost got clipped by a turning bus 

[KB02]

Cool! Thanks for the replies. Gordon, I'll try it your way. It should look a damn site nicer that way, too.