EFI - Sensitive to gas level??
Outstanding HDF Member
Joined: Apr 2006
Posts: 2,282
Likes: 52
From: DFW
RE: EFI - Sensitive to gas level??
I just posted a similar question, although my bike at 100 miles or so to empty doesn't really sputter or act as if it's going to die, it just doesn't seem to run as strong or smooth. The hose in the tank was offered up as the answer. I haven't had a chance to get it by the dealer yet, but it makes sense to me. If the gas level falls below the hose where the small, even pin hole is, you can feel the like of fuel pressure and it may feel like I have described...just not as crisp and smooth. I'm gonna have it looked at soon.
RE: EFI - Sensitive to gas level??
Here ya go. Read this thread. I had the problem a couple of years ago and this thread saved me a bunch of money. You'll have to double click on the picture to get it to show. Check the post by HDF Tech.
https://www.hdforums.com/m_196675/tm.htm
https://www.hdforums.com/m_196675/tm.htm
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Cruiser
Joined: Feb 2007
Posts: 219
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From:
RE: EFI - Sensitive to gas level??
Once again the HDForum community has come through with great information...thanks to all!
I didn't even think about a pinhole in the fuel line as a root cause, but it makes sense since the bike exhibits the problem when the fuel level gets low. I might as well bite the bullet and replace all the fuel lines at the same time I R&R the filter. The idea of splitting the old fuel hose and using it as a chafe guard for the new line is worth it's wieght in gold. You can't buy this kind offeedback for love nor money.
Are there gasoline safe tie wraps in the market or should I justfriction fit the old fuel line around the new one? I'm thinking it should be a pretty snug fit and wouldn't require any additional securing method.
I didn't even think about a pinhole in the fuel line as a root cause, but it makes sense since the bike exhibits the problem when the fuel level gets low. I might as well bite the bullet and replace all the fuel lines at the same time I R&R the filter. The idea of splitting the old fuel hose and using it as a chafe guard for the new line is worth it's wieght in gold. You can't buy this kind offeedback for love nor money.
Are there gasoline safe tie wraps in the market or should I justfriction fit the old fuel line around the new one? I'm thinking it should be a pretty snug fit and wouldn't require any additional securing method.
Ultimate HDF Member
Joined: Aug 2007
Posts: 9,486
Likes: 4
From: Hico, TX (once home to Billy the Kid)
RE: EFI - Sensitive to gas level??
McMaster Carr page 1468
http://www.mcmaster.com/
Harsh-Environment Cable Ties
High-Temperature Nylon[/align][/align]
High-Temperature Nylon Ties— Added chemical stabilizers permit continuous use at temperatures from -40°to +221°F. Color is black.
Fire-Retardant Nylon Ties— Meet UL 94V0 flammability requirements. Temperature range is -40°to +203°F. Color is off-white.
Chemical-Resistant Tefzel Ties— These ties are resistant to a wide range of chemicals, withstand high temperatures and UV light, plus meet UL 94V0 flammability requirements. Temperature range is -65°to +302°F (except for 70215K81, which is -50°to +302°F). Color is blue.
Parched-Environment Polypropylene Ties— These ties will not become brittle in dry environments. They also withstand the effects of acids, alcohols, and salts. Temperature range is 40°to 221°F. Color is black. [/align]
I knew someone had that info
http://www.mcmaster.com/
Harsh-Environment Cable Ties
High-Temperature Nylon[/align][/align]
High-Temperature Nylon Ties— Added chemical stabilizers permit continuous use at temperatures from -40°to +221°F. Color is black.
Fire-Retardant Nylon Ties— Meet UL 94V0 flammability requirements. Temperature range is -40°to +203°F. Color is off-white.
Chemical-Resistant Tefzel Ties— These ties are resistant to a wide range of chemicals, withstand high temperatures and UV light, plus meet UL 94V0 flammability requirements. Temperature range is -65°to +302°F (except for 70215K81, which is -50°to +302°F). Color is blue.
Parched-Environment Polypropylene Ties— These ties will not become brittle in dry environments. They also withstand the effects of acids, alcohols, and salts. Temperature range is 40°to 221°F. Color is black. [/align]
I knew someone had that info
Seasoned HDF Member
Joined: Aug 2007
Posts: 8,200
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From: NW AR
RE: EFI - Sensitive to gas level??
Well, I think it's safe to say that your miss is because the injector rail is not getting fuel at the proper pressure. Now why that may be is what you need to find out. If this only happens when you are low on gas, does it happen when you're turning, accelerating, braking, what? I'm not familiar with the insides of your tank, but I have read that the EFI Sportsters (not ours, factory EFI ones)report problems similar to yours when low on gas. For example, if the fuel pump pickup is on the right and you are low on gas and leaning left, it could suck air with a proper baffle/sump system in place. A proper EFI system needs some type of surge tank set up or swirl pot to avoid these problems. Most automotive gas tanks will have a recess built in like that. On our Sportster, I put a large (for a bike) fuel filter between the tank and fuel pump to act as a poor man's surge tank, and it works fine. If the petcock sucks air, there's still about a cup of fuel in the filter to feed the pump. That's not going to work with your internal pump. Carbs don't have these issues because there's enough gas in the float bowl to get you a half mile.
If your miss is not related to a surge issue, then a hole in the line feeding the pump may be causing it to suck air when the fuel level drops below the hole. It sounds like you're on the right track. I would not suspect a fuel filter issue if the miss only occurs at low gas levels. Partially clogged fuel filters usually cause a loss of power at higher flow rates, like wide open throttle, and not related to the fuel level in the tank.
If your miss is not related to a surge issue, then a hole in the line feeding the pump may be causing it to suck air when the fuel level drops below the hole. It sounds like you're on the right track. I would not suspect a fuel filter issue if the miss only occurs at low gas levels. Partially clogged fuel filters usually cause a loss of power at higher flow rates, like wide open throttle, and not related to the fuel level in the tank.
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Cruiser
Joined: Feb 2007
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From:
RE: EFI - Sensitive to gas level??
Dr.Hess...Ihaven't noticed if the condition gets better or worse regardless of the bike's orientation,although, I wasn'tlooking for that indicator. It seemspredominently when the fuel is low and I'm riding straight-up. With that said, you've given me another data point to consider.
FYI, HD sells a fuel filter replacement kit @ $95.00!! My Bud at the Stealership told me while I'm in the tankI might as well R&R the fuel regulator. If I buy both at the same time he'll sell me the Filter kit for $51.00 and the Regulator @ $40.00.
We all know what HD stands for...Hundred-dollar. Heh, heh!
J.
FYI, HD sells a fuel filter replacement kit @ $95.00!! My Bud at the Stealership told me while I'm in the tankI might as well R&R the fuel regulator. If I buy both at the same time he'll sell me the Filter kit for $51.00 and the Regulator @ $40.00.
We all know what HD stands for...Hundred-dollar. Heh, heh!
J.
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