I recently got done installing a Hammer Performance 1275 kit in my 2015 Sportster, and I'm planning on running the bike on E85. I already picked up some 5.7gps injectors and a Kemso 13806 fuel pump. What I'm a tiny bit worried about is the factory quick disconnect fitting on the bottom of the tank being a flow restriction. HPI has a high flow fuel line kit but only for M8s. I was thinking about trying to piece together my own kit, replacing the quick disconnect on the bottom of the tank, and having a line made. If anyone knows what thread the female end of the quick disconnect is, and if I can even get the fitting on the other end of the fuel line, the end that connects to the fuel injectors. I'd like to be able to run an extra fuel filter between the tank and injectors too.

 

Why don't you you run it and see what it does before you dive in and spend money. Its just a fuel line that is easy to get to if you need to change it. I am guessing that the M8 fuel line up size, is a racing thing anyway. There are numerous 135 cu inch engines out there running the stock fuel lines, that are literally almost double the cubes your bike is, with no issue. Granted flow rates for E85 are bit higher, but I would bet you will be fine. And why do you need to run 2 filters?
Running the same micron filter, one in front of the other accomplishes nothing, as the primary filter will catch the majority of the debris and anything that the first filter missed because of the smaller particles, will just pass right through the second filter. You could run a staged filter system, but I don't get why you need the complication. Not to mention you will have to make sure that second filter is rated for the approx 60psi Harleys run the FI pumps at.

 

The Kemso 13806 fuel pump appears to run at 45psi. Will that work on a bike where the existing pump runs at 55 to 62psi?

 

Pull the stock disconnect it's 1/4" NPT into the tank. Replace it with a -6 AN fitting. For the fuel rail end, you need a 5/16" quick disconnect adapter (also -6 AN). Run a -6 AN line between them, add an E85-rated inline filter, and you're set. That Kemso pump will flow fine without the factory restriction.

 

From what I read that kemso pump is rated at 200LPH at 43psi, but it can run up to 68psi.

Awesome, thanks a lot for the fitting/thread info, that's really great info.

I still have to start the break in process for the 1275 kit, so I'll do that on pump gas. I wouldn't want to start learning how to tune the bike for E85 while just starting the break in.

Not going to lie, it's been almost 5 years since I was inside the fuel tank (I had to replace the factory pump after it started whining a bunch) so I didn't remember that there was a cartridge style filter in there along with the sock style pre filter on the pump. I didn't replace that filter or the regulator when I did the pump. I do have a new regulator for when I switch over to E85. Definitely going to have to pick up a new filter too. Hopefully those paper cartridge filters will do alright with E85.