Main Fuel line

[Oscar Maldonado]

I just changed out my fuel line and was wondering if there is a certain length that it should be?

Reason I ask is because the petcock is clean, the tank is clean,there are no obstructions in the gas line and the gas flows when the gas line is removed from the carb but I get no gas to the carb.

I pulled the line to the carb and I have nothing. I pulled the the bowl and it's dry.

Here's what I tried -

I turned the gas on and it flows at a pretty good flow - That's with the line facing down towards the ground. Now, when I turn the gas on and I hold the line up simulating that it's going back into the carb I have no flow - meaning that I have no gas overflowing from the line when the gas is on.

I want to say that the line might be to long and if it is how much should I take off?

Can someone with a pitbull measure the length from the petcock to the carb and let me know please, it doesn't have to be spot on. A guesstimate would work.

 

[stryfox]

Try taking off the gas cap. Could be a stuck clogged vent.

 

[DRBarnhart]

Sorry, I don't have a Pitbull so I can't measure the line for you. I would say the line should be as short as possible making sure it does rub on anything, make sure the line is stout enough not to kink where it bends, and it should be large enough in diameter not to vapor lock.

Yours sounds like it's kinking and/or vapor locking when you raise it up to the carb. What stryfox said is definitely worth a shot, if nothing else, just to rule out the gas cap. :up:

Is the line you're using the stock line or a replacement?

Dennis

 

[Oscar Maldonado]

Thanks guys. I removed the gas caps and tried the same thing I did with the fuel line and came up with the same results. So I guess that would rule out the vapor lock. I'll shorten the line inch by inch.

And to answer you question Dennis it is a replacement fuel line.

 

[kickstart]

Oscar, did you check the screen on the petcock? Is the tank liner peeling?

 

[Oscar Maldonado]

Hey Pat,
No liner damage and I removed petcock thoroughly cleaned it off and there is no trash in the tank.

 

[LARS]

Hey Oscar,are you using a braided replacement,if so maybe the rubber line is getting kinked when your making the bend(???).Of course this answer is coming from a drunk that does not claim to be a mechanic....at all.Good luck

 

[kickstart]

Hey Pat,
No liner damage and I removed petcock thoroughly cleaned it off and there is no trash in the tank.

I had a issue with big flakes from the liner cloging the screen. If your getting a good flow out of the line and nothing is in the tank about the only thing left is the needle valve must be hanging up somehow.

 

[Dawgboy]

If I understand your description correctly, it flows with the line below the carb then stops as you raise the line to the height of the carb... That eliminates the carb, tank, cap and petcock etc from the equation particularly if the flow resumes as you lower the end of the line again. I'll go with a kink as well.

 

[V]

Should be 5/16" line. I don't have a pic but mine just loops under the carb bowl. Might hang down 2" below the bowl fitting.

 

[08mastiff]

It may be normal then. Try putting it back together and see if there is a difference with the way the bike performs. Don't really know just brainstorming.

 

[Oscar Maldonado]

Thanks guys. I've been messing with this for the last couple of hours and still can't figure it out.

I've taken the caps off of the tanks to see if that makes a difference and nothing. There is no kinks in the line and I went as far as stripping the braid off of the line assuming that could've been the issue and nothing. I cut 2.5" off of the line and still nothing. I took the bowl off of the carb and tried an experiment that way and it fills somewhat with gas. Put the bowl back on and nothing.

I'll keep on trying different things and keep you all posted if I come up with a fix.

Thanks again.
Oscar

 

[stryfox]

This is very odd. It's just a hose hooked to a tank and fed by gravity.
Keeping the physics simple if there is adequate liquid supply and no obstructions ,when exit on the open hose is lower than the fuel level it should flow.

 

[Oscar Maldonado]

I had a issue with big flakes from the liner cloging the screen. If your getting a good flow out of the line and nothing is in the tank about the only thing left is the needle valve must be hanging up somehow.

You were correct Pat! The needle valve was the issue. I pulled it apart, cleaned it up and the bowl filled right up. Now she screams like she been raped!

Thank you all for your imput! That's what makes this place an awesome site!

Pat. - I owe ya! I'm heading down to Florida in a couple of months so we'll hook up and do some riding!

Thanks again yall!
Oscar

 

[kickstart]

Oscar, just let me know when you heading down, glad your back in the wind.

You don't owe me a thing, glad I was able to help :up:

 

[PaulHart]

I turned the gas on and it flows at a pretty good flow - That's with the line facing down towards the ground. Now, when I turn the gas on and I hold the line up simulating that it's going back into the carb I have no flow - meaning that I have no gas overflowing from the line when the gas is on.

I'd thought needle valve too except you said it quit flowing with the line disconnected and raised up to the level of the carb. Glad your up and runnning though.

 

[stlmikie]

I would have guessed that he was low on fuel.

 

[Oscar Maldonado]

I would have guessed that he was low on fuel.

I agree with that but both tanks were full.:lol:

 

[Nukeranger]

Maybe the fuel line is defective. We had a hose at work with an internal liner that kept getting stuck together and blocking flow. We kept using air pressure to blow it open. We will be replacing it. Check yours and see if it has a liner inside.