Wild Bill NV

Fires right up when cool, but no fuel getting to carb when hot. Relays replaced, new battery, plenty of spark, injectors spray well, and no error codes. 2007 Ultra Classic.

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Bodeen

Welcome to the forum!

Couple questions, "no fuel getting to carb", 07 UC wasnt a carb bike so what does that mean? Hoople is going to want to know what "plenty of spark" means? Was it measured in some way? "Injectors spray well". Was fuel pressure measured? Which brings me back to the original part about the carb not getting fuel. If "injectors spray well" What exactly is not getting fuel?

The more accurate information given will aid in the help received. Tell us what you tested and how, that will go a long way.

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moto mundo

is this a fuel injection or a carb. bike.

Wild Bill NV

Thank you for the welcome and your patience. My apologies to all. I was tired and ragged when I made my post and left without clarifying myself or accurately describing my problem.

The bike is injected and the spark was measured by removing the plugs (one at a time) when the bike is cool she would fire up fine and run great until she got hot and I would stop. She would fire back up immediately, but after sitting for a few minutes, she would turn over, get spark, but no fuel. I did not measure the fuel pressure except to open up the breather while she was running and see no problems, however no fuel after sitting when hot. After 20-30 minutes of cool down time, she would fire up and run great.

While I have since remedied the problem, I will continue with my thought process and the remedy that I used to solved the problem in case anyone else should have this issue.

Since spark was not an issue hot or cold, I ruled that out. The fuel issue on the other hand I did not believe it was a pressure problem since when she ran, she ran well. So if it were a pressure issue she would have at least sputtered while riding. So I was left with the problem of the ecm not getting the signal to allow fuel to flow at high temp.

I preformed an onboard diagnostic and had no error codes. Thinking that Harley would include ALL the sensors in a diagnostic was my mistake lol. After an evening of reading and a call from a friend, I decided to take the cheap route and swap out the IAT and the engine temp sensor. while I was at it I changed the oil and the trans fluid. Bingo! She ran like a dream.

The whole fix including the oil change was around 100 bucks, plus time and aggravation lol

Thank you all for the quick reply and I do hope that this will help someone else should they have the same type of issue. Once you rule out what it can't be, you are left with a solution.

In the wind,
Wild Bill

Hoople

Bill, Happy your running again and not trying to jinxs your repair but I just can't see those sensor starving your engine of fuel when it was HOT. A Cold engine yes, but not when hot.
Did you happen to meter out those 2 sensors in order to try and understand the "why"?
If a sensor was open or shorted, a code would exist. They had to read some value that was in-between. A puzzle to me.

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eleft36

Did ya clean the IAC port?? They do get loaded up.

I think the "head" temp sensor failing would show a code, like Hoople said.

Al

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