sporadic fuel issue


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Jag39
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sporadic fuel issue

Post by Jag39 » Tue Oct 23, 2018 10:09 am



I started having a sporadic fuel related issue about 3 months ago on a trip to Key West. On that trip, the problem arose 3 different times, but since then, has only popped up twice. The problem: Cruising along at normal speeds from 65-70mph. Bike will suddenly start decelerating. Trying to add throttle only makes it worse. Holding throttle steady results in bike gradually slowing down, with sporadic burts which will bring bike back up to speed, only to start the process over again. Worst occasion lasted 18 miles while trying to limp into next town. Sometimes bike would slow to the point where I was just about to put my feet down, then would start up again. Seems to be starving for fuel. On one occasion, I popped the bike in neutral at about 60, turned the ignition off, let it coast a bit, and turned the ignition back on, and it went on it's way. Have tried this again, without the same effect. The bike will run great for weeks at a time, then suddenly the problem pops up again. One other note. The time I limped 18 miles to the next town, it was hot, late, and I was tired. Decided to call it a day and start fresh in the morning, though I did check the fuel filter, and it was fine. Next morning, it cranked fine, so decided to fill the tank, and gamble on trying to make the 25 miles to Labelle, for breakfast. Bike ran fine, and problem did not come up again for some weeks.

My first thought is pull the seat and fuel pump and see if something is floating around in the tank, that may be sucked up against the pickup. Thought I would see if anyone else has experienced this problem. Really need to try and solve it, since I want to do a trip across the country and don't need this happening in the middle of nowhere.



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GlimWas
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Re: sporadic fuel issue

Post by GlimWas » Tue Oct 23, 2018 11:04 am

You might want to take a look at your gas cap too. It might be not venting the gastank properly, resulting in the symptoms you are describing
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virgilmobile
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Re: sporadic fuel issue

Post by virgilmobile » Tue Oct 23, 2018 11:08 am

Also tend to the vacuum line that operates the fuel valve.The hose can harden and loose vacuum that keeps the valve open.

Jag39
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Re: sporadic fuel issue

Post by Jag39 » Tue Oct 23, 2018 11:42 am

GlimWas wrote:
Tue Oct 23, 2018 11:04 am
You might want to take a look at your gas cap too. It might be not venting the gastank properly, resulting in the symptoms you are describing
I did think of the gas cap, and tried it while "coasting". Failed to mention that. Thanks!

Jag39
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Re: sporadic fuel issue

Post by Jag39 » Tue Oct 23, 2018 11:46 am

virgilmobile wrote:
Tue Oct 23, 2018 11:08 am
Also tend to the vacuum line that operates the fuel valve.The hose can harden and loose vacuum that keeps the valve open.
Not sure where the fuel valve is, but will start trying to backtrack from the fuel pump. Thanks, something I will definitely try to check out.

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virgilmobile
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Re: sporadic fuel issue

Post by virgilmobile » Tue Oct 23, 2018 11:49 am

The fuel valve lives in front of the gas cap.The vacuum line that feeds it comes off the right side intake runner.

Jag39
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Re: sporadic fuel issue

Post by Jag39 » Tue Oct 23, 2018 12:05 pm

I've noticed that, and was headed to check that first. Didn't know what it was, though. Thanks for pointing it out.

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virgilmobile
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Re: sporadic fuel issue

Post by virgilmobile » Tue Oct 23, 2018 12:26 pm

You can pull a vacuum on it and see if it holds..

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virgilmobile
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Re: sporadic fuel issue

Post by virgilmobile » Tue Oct 23, 2018 12:30 pm

This will be a process of elimination..
Verify the easy stuff first...and your just assuming it's fuel related...How bout loose connection on the kill switch as another easy check.

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ct1500
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Re: sporadic fuel issue

Post by ct1500 » Tue Oct 23, 2018 3:25 pm

The 1500 fuel pump dies a slow death with symptoms of reduced fuel pressure.

Easiest way to confirm this intermittent problem which only happens at road speeds is to tee a fuel pressure gauge into the fuel line and tape to the shelter where it can be seen.

This will allow you to monitor the fuel pressure and next time it acts up can confirm fuel pump trouble if pressure drops from its' normal 1.5 PSI.
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Rednaxs60
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Re: sporadic fuel issue

Post by Rednaxs60 » Tue Oct 23, 2018 4:02 pm

Check your fuel filter as well. May not be the culprit, but replaced mine when I bought the bike in July. Cut it apart to determine what it looked like and how the fuel was. Fairly plugged. Here's a picture of it cut open:


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kane67
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Re: sporadic fuel issue

Post by kane67 » Tue Oct 23, 2018 11:55 pm

I had about similar symptons when I had placed an extra tube from carbs ventilation pipe to down under bike (that’s a no no...). But it appeared always just when raining, I think tires threw water and maybe blocked the tube end and ventilation for carb bowls failed.

Yours is most likely missing fuel when it happens.

Br, kane



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