2002 Electra Glide Classic 22,000 miles Stage 1 upgrade with Cobra True Duals. Runs fine with a full tank but starts to miss after between 60 and 70 miles. Once fill up it runs fine. Any ideas?? Mike

 

EFI or carburetor? If not EFI, lossen the fuel cap when it starts missing and see what happens. Start with the simple things.

 

EFI. I've tried plugs, new gas, cleaned the air cleaner. All the basic stuff. Mike

 

Check your fuel pressure.....

 

Bob is correct. Even though it may seem to run ok with a full tank it could be on the lean side even then. In order for efi to work exactly as it should it must start with a constant designed in pressure. For example, the injector time to be open is set at 50 psi to deliver the correct fuel and the pressure has dropped to 40 but the pulse is the same on the injector. The result is leaner. By doing a pressure test it will indicate whether the fuel system is putting out what it should. It should also hold pressure for a given time when engine is switched off. If it don't, look for most likely a pinhole in the line from the quick disconnect and regulator.
Ron

 

I agree there must be something amiss with fuel pressure or fuel pick-up inside the tank. The Delhi system has all the "guts" inside the tank and lines have been known to rub due to vibration. If it has always done it, I'd suspect the fuel pump has shifted out of position or never was set low enough in the tank and it is simply running out of fuel. If it has just started, the guys above are onto it...maybe a hole or loose line connection on the plumbing in the tank, which is masked by the extra fuel when full. You can get to that by removing the dash-board on top and then the plate mounted on top of the tank. All the components are mounted on a rod attached to this plate and will pull out with the plate.

I have a small externally mounted fuel pressure gauge on mine. I had a fuel pump crap-out on me once and the gauge is a good diagnostic tool to keep an eye on fuel pressure.

 

hole in the line,fixed prob many times in the shop
kirby
vee twin racing

 

Thanks for all the responses. I was about to pull the fuel pump (and all the other stuff. I'll try the fuel pressure check first. I'll let you know what the outcome is. Mike

 

Prodrags answer is my bet

 

Thanks to all that replied, I took the tank apart this morning and the problem is a small rub hole in the convoluted tube. My dealer is closed today so I'll be there when they open in the morning. Again thanks for all the advice. Mike