New fuel pump = power?

I recently replaced the pump on my 87 700. I am curious if I am seeing a power increase? I'm not sure if this is even possible. The bike seemed to be running fine before and from what I know of mechanics it doesn't seem possible, but I'd swear it runs better. It didn't seem like it was starving for fuel before but I'm curious if anyone else has experienced this.

 

I "rebuilt" the one on my 86 with the kit from K&L and I noticed a little gain when put it on my Butt-Dyno as well. After all these years, they're probably just stoked to get some new parts once in a while.

 

So why did u replace the pump if the bike seemed to run fine ?? I think your butt dyno is imagining things.

 

http://www.airtexproducts.com/news-...-secret-to-increasing-engine-performance.aspx

I know on a fuel injected engine, a new strong pump will ensure that the injectors are at the best pressure and thus the spray pattern and pressure is accurate.

 

EFI pumps have an entire range of requirements different from pumps that supply carbs. The average pump for VF/VFR carbs will easily supply about ten times the amount of fuel necessary for good running even at top speed.

 

When I left the fuel on with the old pump I had a leak just from the static pressure from the tank. If I turned the fuel off when I parked it, it was fine and did not leak when it was running. A couple of weeks ago, when leaving work, I noticed that there were a few drips even when the bike was idling....not good. Remember, this was the bike that sat for 19 years covered in a garage, the replacement was not surprise, I just held off as long as I could.

RotaryRocketeer: Though it's too late for me, I'm interested in this "rebuild". The halves were crimped together so I assumed a rebuild was not possible.

 

It wasn't a full rebuild kit, but that's what the vendor calls it. It's really just a replacement for the contacts on top and the little bracket that they sit on. Just a bit of solder and they're easily replaced.

 

So, it was an issue with it not running, not a leak like I was experiencing?

 

It was running intermittently. One of the contacts was pushing itself over to the side and not getting close enough to the other to spark. I got tired of having to pull over and take off the cover and hit it with a screwdriver handle. I didn't see the post where you said yours was leaking, so my input doesn't really apply. :topsy_turvy: Bad diaphragm I'm guessing...