fuel problem i think
Devil's Advocate
Joined: Jun 2010
Posts: 2,070
Likes: 36
From: Alberta, Canada
I had to replace the fuel line in my 07 FXDB with a submersable fuel line I got from NAPA. Beats the heck out of replacing the tank innards just to replace the fuel line.
Outstanding HDF Member
Joined: Apr 2012
Posts: 2,938
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From: North Florida
IICRC: Most FI fuel line issues are caused by the fuel line rubbing against the inside of the tank, this causing pin holes in the fuel line.
I had to replace the fuel line in my 07 FXDB with a submersable fuel line I got from NAPA. Beats the heck out of replacing the tank innards just to replace the fuel line.
I had to replace the fuel line in my 07 FXDB with a submersable fuel line I got from NAPA. Beats the heck out of replacing the tank innards just to replace the fuel line.
I'm a carb guy.
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Cruiser
Joined: Jul 2010
Posts: 242
Likes: 0
From: park county colorado
Just to clarify the bike ran fine for at least 20 mins it wasnt until it warmed up and by that i mean oil temp was at 200 deg that it started acting up . After i shut it off i heard loud hissing from under the bike where the vent hose comes down i could see the fumes rushing out of the hose. I took the gas cap off and the fumes to the vent stopped I took a flashlite and looked INTO the tank and saw air bubbles coming up and out of the crossover fitting thats INSIDE the bottom of the tank. Those air bubbles lead me to believe that no fuel was crossing over when the gas cap was on . I didnt at that point try to run the engine without the cap however i left the cap off until the bubbles stopped . So im thinking the left side of the tank should have fuel in it now????
Devil's Advocate
Joined: Jun 2010
Posts: 2,070
Likes: 36
From: Alberta, Canada
They are both feed.
What you will see in the tank when the gas level is low is spraying in the tank. It is harder to see the gas swirling around with a full tank. You generally do not notice the issue as much when the tank is full. In most cases the hole are very small.
HD does not sell just the lines, only the assemblies. I got submersible gas line from NAPA and used spring clamps.
I still believe the OP's issue is more likely the gas cap venting. When things heat up, it causes more of a vacuum and fuel will not flow properly.
Last edited by Gommee; Mar 16, 2015 at 07:20 PM.
Outstanding HDF Member
Joined: Apr 2012
Posts: 2,938
Likes: 30
From: North Florida
Just to clarify the bike ran fine for at least 20 mins it wasnt until it warmed up and by that i mean oil temp was at 200 deg that it started acting up . After i shut it off i heard loud hissing from under the bike where the vent hose comes down i could see the fumes rushing out of the hose. I took the gas cap off and the fumes to the vent stopped I took a flashlite and looked INTO the tank and saw air bubbles coming up and out of the crossover fitting thats INSIDE the bottom of the tank. Those air bubbles lead me to believe that no fuel was crossing over when the gas cap was on . I didnt at that point try to run the engine without the cap however i left the cap off until the bubbles stopped . So im thinking the left side of the tank should have fuel in it now????
The hose has no way to get pressure from one side to the other because the two halves are connected. It will not bubble, it will not cause any excess pressure in the tank.
Your bike is fuel injected with a pump inside the tank, this pump pumps gas out and any excess comes back through the bottom return.
This is where your extra pressure is coming from in your tank, and probably what is causing the bike to run sluggish.
I am not a fuel injected expert, but know that there is a hose in the tank that gets pin holes and leaks. This is where you need to look, but like I said, I do not know anything about this because it does not pertain to my bike so I don’t pay attention to the details.
Gommee know more about this, that is why I am deferring to him.
Outstanding HDF Member
Joined: Apr 2012
Posts: 2,938
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From: North Florida
Well that would be pretty easy to check, by taking the lid off and like I said, just suck on it to test, or try running it with the cap loose.
Outstanding HDF Member
Joined: Apr 2012
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From: North Florida
This it the venting out vent.
Tourer
Joined: Aug 2012
Posts: 482
Likes: 0
From: Vancouver
I vote e-10 gas. I have a film container sitting on my tool chest with filtered out e-10 junk. Looks like a brown gel. If you have a carburetor system you need to remove all fuel. Flush tank.
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Devil's Advocate
Joined: Jun 2010
Posts: 2,070
Likes: 36
From: Alberta, Canada
There in NO return line to the tank. The gas goes through the fuel filter to the fuel pump to the quick connect to the injectors. The system is under pressure. There are two vents, one is the over flow hose that goes via the top of the tank along the backbone and down by the back tire and the other is the vent in the gas cap.
I have seen both the pin holes and the cap vent issues. One creates a vacuum and the other reduces fuel pressure. Both will show up as an issue when bike heats up.
Here is the link to the fuel line issue I found helpful in the Dyna forum. I know there are several other threads, but this is the one that helped me.
https://www.hdforums.com/forum/dyna-...fuel-line.html
I have seen both the pin holes and the cap vent issues. One creates a vacuum and the other reduces fuel pressure. Both will show up as an issue when bike heats up.
Here is the link to the fuel line issue I found helpful in the Dyna forum. I know there are several other threads, but this is the one that helped me.
https://www.hdforums.com/forum/dyna-...fuel-line.html
Last edited by Gommee; Mar 16, 2015 at 07:42 PM. Reason: spelling
Devil's Advocate
Joined: Jun 2010
Posts: 2,070
Likes: 36
From: Alberta, Canada
OP states he has Fuel injection and issue only shows up when engine temp gets hot. If it was bad gas or water in the tank issue would show up sooner.