I might have found some more potential in these pumps.
I've got a 3B inline pump on the bench in bits at the moment and the diaphragm doesn't travel far enough for the rack to reach full fuel. The rack has 19mm of travel and the diaphragm approximately 14mm. I can't say how much travel the daiphragm was giving up on the max fuel end, but it felt like a few mm. I busted the centre out of the leather whilst trying to figure it out, it was already quite torn.
It's probably dependent on who made your diaphragm but this one would have been original. It would be quite easy to check. Remove the diaphragm cap, remove fuel screw and see if you can push the diaphragm in far enough to max out the rack which will bottom with a nice "click". If it does bottom out you should tell us what brand diaphragm you are running so we can buy one too.
Inside the diaphragm housing the fuel rack can be mechanically limited by 2 things, the stop lever that your edic is connected to (on the right/upper/top of pump) and the governor/rev limiter (on the left/lower).
In the above pic I have the rack at the full fuel position. Although it looks close, the arm from the stop lever is actually a good 10mm away. The governor arm is only about 1mm away. I'd be interested to see how much the governor arm holds up fuel. There's a graph for it in the manual but it only goes from 12.9mm rack travel and those with maxed out pumps will be using much more than that. However, it does say by 3520 rpm it's moving the to less than 12.9mm which is a lot of travel to lose over the potential whole 19mm. You could easily disable the governor by removing the pin that its arm acts on.
Also for what it's worth, with the fuel screw in this position the rack is just hitting full fuel (with out compressing the capsule at all) so there's no need to completely remove the fuel screw, but it wont hurt anything if you do.
I've got a 3B inline pump on the bench in bits at the moment and the diaphragm doesn't travel far enough for the rack to reach full fuel. The rack has 19mm of travel and the diaphragm approximately 14mm. I can't say how much travel the daiphragm was giving up on the max fuel end, but it felt like a few mm. I busted the centre out of the leather whilst trying to figure it out, it was already quite torn.
It's probably dependent on who made your diaphragm but this one would have been original. It would be quite easy to check. Remove the diaphragm cap, remove fuel screw and see if you can push the diaphragm in far enough to max out the rack which will bottom with a nice "click". If it does bottom out you should tell us what brand diaphragm you are running so we can buy one too.
Inside the diaphragm housing the fuel rack can be mechanically limited by 2 things, the stop lever that your edic is connected to (on the right/upper/top of pump) and the governor/rev limiter (on the left/lower).
In the above pic I have the rack at the full fuel position. Although it looks close, the arm from the stop lever is actually a good 10mm away. The governor arm is only about 1mm away. I'd be interested to see how much the governor arm holds up fuel. There's a graph for it in the manual but it only goes from 12.9mm rack travel and those with maxed out pumps will be using much more than that. However, it does say by 3520 rpm it's moving the to less than 12.9mm which is a lot of travel to lose over the potential whole 19mm. You could easily disable the governor by removing the pin that its arm acts on.
Also for what it's worth, with the fuel screw in this position the rack is just hitting full fuel (with out compressing the capsule at all) so there's no need to completely remove the fuel screw, but it wont hurt anything if you do.
