intermittent fuel flow By scoot (Read 2,658 times)

[jct842]

Good possibility of too long a gas line, it should be going down hill from the fuel petcock to the filter then the carb with out going back up. A carb would be a waste of money as he said it works ok when it is working and a carb not likely to quit then start working again.

[Guitarman]

HOW did you do the tank check? Did you take it all the way off and clean it out really good, or did you just look down inside?

[tvnacman]

I must have missed something here . After we spoke , I thought it was understood you did not have a carb problem. If someone insulted you here some how . That Is Between You And Them . I don't see how I was a part of that .

John

[Bashan]

Another thread bursting into flames! I think we may be experiencing the mid-winter affective disorder syndrome. Let's take it down a notch folks and take a breath. There, that's better, now a group hug. Hmmm, that's nice and Cyborg quit grabbing my butt! Perv! Okay, we're calm now, let's continue......DING!

[scoot]

Alleyoop,scoot,cyborg,jct842,Guitarman,tvnacman,Bashan ok.I agree with Bashan lets take it down a notch .when I said the flow was good after the fuel filter I meant when I disconnected the fuel line from the carb. side of the filter not the fuel tank side, the gas flow was fine.so the fuel is flowing from the tank down to the filter thou the filter but stops before filling the float bowl at the carb. now when I'm riding and the problem happens the filter is dry I've try'ed opening the gas cap that would brake a vacuum if there was one.(right) and I can see the bung at the bottom of the fuel tank no blockage.the only thing that works to get it going again is to blow on the vent hose or disconnect the fuel line at the fuel filter and when I do that the fuel flow is fine.now I know this sounds like a classic vent problem but opening the gas cap should brake the vacuum.It's like the needle at the float bowl is stuck and it needs a little pressure to open it and let the fuel in and fill the bowl.and blowing in the vent line gives it that little extra push. I've had the carb. off and cleaned it and adjusted the float level it seems fine.so just to put to rest the tank issue I'm going to rig up a temporary fuel tank out of a gas can and see what happens.also some one asked if the vent was still hooked up to a canister ,it is not, not even a filter till I fix this problem.now as not to get anyone mad at me if you need more info just ask me.and I'll do my best to explain myself.thank you all for your help. Scoot

[Alleyoop]

Ok PEACE BRO.
Maybe it is the FUEL FILTER that is causing the blockage it maybe on backwards which will restrict the flow. So just take the fuel filter off or buy a new fuel filter. Or how about picture of the fuel filter so we can see how if it is on backwards or not.
Alleyoop

[tvnacman]

What kind of gas filter are you using ? I skimmed the thread someone asked if you have low spots in the fuel line . Do you have any low spots in the fuel line ? These are questions that are important to rule out . Items that would be picked up at a glance (if it were a hands on troubleshoot).

Can you bypass the fuel filter for a test to rule out the filter ?

John

[scoot]

Alleyoop,scoot,cyborg,jct842,Guitarman,tvnacman,Bashan ok bro it's over,the fuel filter is new and the arrow on the filter is pointed in the right direction pointing from the tank to the carb, but as we all know a new part can be bad,but as I said when I disconnect it from the carb side the fuel flows, so I think the the filter is good,but I'm up to buying a new one if need be anyway I'm going to do the temporary fuel tank idea I talked about in the last tread and see what happens.at this point I'm game for any thing that will solve this problem,and just to let you know I really do respect your advice and have asked for YOUR SPECIFIC advice in the past and hope you will continue to advise me in the future. I'm over it I hope you are too.later Scoot.

[jerryscript]

Feb 3, 2015 18:12:51 GMT -6 scoot said:

Alleyoop,scoot,cyborg,jct842,Guitarman,tvnacman,Bashan ok.I agree with Bashan lets take it down a notch .when I said the flow was good after the fuel filter I meant when I disconnected the fuel line from the carb. side of the filter not the fuel tank side, the gas flow was fine.so the fuel is flowing from the tank down to the filter thou the filter but stops before filling the float bowl at the carb. now when I'm riding and the problem happens the filter is dry I've try'ed opening the gas cap that would brake a vacuum if there was one.(right) and I can see the bung at the bottom of the fuel tank no blockage.the only thing that works to get it going again is to blow on the vent hose or disconnect the fuel line at the fuel filter and when I do that the fuel flow is fine.now I know this sounds like a classic vent problem but opening the gas cap should brake the vacuum.It's like the needle at the float bowl is stuck and it needs a little pressure to open it and let the fuel in and fill the bowl.and blowing in the vent line gives it that little extra push. I've had the carb. off and cleaned it and adjusted the float level it seems fine.so just to put to rest the tank issue I'm going to rig up a temporary fuel tank out of a gas can and see what happens.also some one asked if the vent was still hooked up to a canister ,it is not, not even a filter till I fix this problem.now as not to get anyone mad at me if you need more info just ask me.and I'll do my best to explain myself.thank you all for your help. Scoot

One small problem with your conclusion, if you are blowing into the gas vent tube, you should not be able to blow fuel past the petcock. The petcock should not allow fuel to flow unless there is suction on the vacuum actuator (unless you replaced your vacuum actuated petcock with a manual one or a straight line). You may be able to blow a bit past the petcock, but it should not flow without being actuated by the vacuum line.

You need to methodically test from the tank to the carb, so get a bowl to catch the gas and do the following:
1- Remove the line from your fuel tank to your petcock at the petcock end, and see if it flows freely through the filter, if all-good then re-attach
2- Remove the line from your petcock to the carb at the carb end, now remove the vacuum line from your petcock to the intake manifold at the manifold end and suck on it, fuel should flow out the line you removed from the carb, if all-good then re-attach
3- Take apart your carb and clean it real good, paying particular attention to the float assembly. If the float assembly has ANY resistance to movement, you'll need to figure out why.

If all these test seem to show everything is OK, we will move on to other issues.

BTW- A few pics or a video might allow us to see something you may be overlooking, a second set of eyes never hurts when troubleshooting!

[Alleyoop]

I sure would like to see how he has the fuel and petcock setup from the tank to the carb. It could be as simple as a up and down on the fuel hose from the tank to the carb.

SO PICTURES of your setup so we are not guessing.

[scoot]

the fuel line is below the bottom of the fuel tank all the way from the tank to the carb. so it's gravity feed all the way I've by passed the vacuum petcock till I find this problem .hope that helps .

[scoot]

scoot,Bashan,Guitarman,cyborg,rks,Alleyoop,tvnacman Hi Jerry thanks for the advice but I have already bypassed the petcock,when this first happened I thought just like you it was the vacuum petcock but after I bypassed it still did the same thing.man I wish I could figure this thing out,I'ts driving me mad.

[Kaveman]

Any extra photos you can take , would be of big help for us please in getting your scoot back running right.
willc.

[scoot]

Alleyoop I would love to send you pics. I have the camera but don't know how to down size the pictures to send them to you ,sorry

[Bashan]

OK, just spit balling here, how about the carb bowl vent? Is it clear? Cyborg, get your hand off of my arse!