Accelerator pump HELP..

I hope someone can help: I have a 94 wideglide stock CV carb that i rebuild, Now there is gas leaking out of the accelerator pump and it really comes out when i twist the throtle. I replaced the accelerator pump diaphram and o-ring. I also checked the float level, wasn't sure if the wrong float level would cause it to leak out of the pump or not, Yes the float level is right.
Please help...

Maybe you missed putting the little O ring in the bottom of the pump housing....and you have the spring under the diaphragm...

No the o-ring and diaphragm are in right,I have had it apart two or three times and even bought a new diaphragm thinking the other one I bought was bad. when I twist the throttle gas comes out of the rod boot.

OK...sounds like your pump nozzle is plugged or the check ball stuck...
I tried to find a diagram of the CV accelerator pump circuit but couldn't find one,but I did find the procedure you're going to have to go through...

Thanks to CraigArizona85248 on HTT for saving a bunch of typing



There are two passages in your carb bowl leading to the accelerator pump. One passage is used to suck gas from the carb bowl into the pump diaphram. The second passage is used to take the gas out of the accelerator pump and route it to the nozzle and ultimately spray it down the carb throat. When you twist the throttle the gas in the accelerator pump is sent down both passages. Because the volume of gas is relatively high compared to the size of the passages, gas should squirt out of the nozzle and spray up into the bottom of your float bowl. When you release the throttle and the accelerator pump diaphram opens again, gas is sucked through the hole in the bottom of the carb bowl to refill the pump. The checkball and spring under your nozzle is there to keep the accelerator pump from sucking air back into the nozzle and only getting a partial charge of the accelerator pump.

I suspect you have a blockage in the passage that leads from the nozzle to your accelerator pump. Because this passage is blocked you are getting nothing out of your nozzle and you also saw a strong stream of gas returning to the float bowl when you activated the accelerator pump. Here is how I would test for a blockage.

Remove your carb bowl
Remove the nozzle from the carb bowl
Clean the pump nozzle really well
Reinstall the nozzle without the checkball and spring
Put the nozzle in your mouth sealing tight with your lips and blow


You should be able to blow air through the nozzle and down the passage to the accelerator pump. It will give you resistance because it's a small passage, but you should easily be able to tell that you are getting air through the passage. If it's blocked, soak your carb bowl in carb cleaner for a few days and retry the same test. Once you get the air flowing, reinstall the checkball and spring under the nozzle. If you do find your passage is blocked, disassemble the rest of the carb (down to the bare body) and soak it for a couple of days too along with all the metal parts (jets, needles, etc.). If your accelerator pump passage is blocked, chances are other passages in the carb have some build of of old fuel deposits too.

-Craig

Most of the time when folks take carb apart. They clean it. but don't blow threw all the holes and make sure they are open.
You can take a carb and hold it upright, and blow threw the hole, Air shouldn't go threw.
Take it and turn it upside down, see if the float fell and air will pass threw the hole with you blowing with your mouth.
The small holes in the carbs has their places.
Ethanol, ethanol eating up rubber hoses and trash will stop up the holes and tubes in the carbs. Ethanol also draws water in the fuel with no stablizer in it.
Another reason I push Starbrite Startron.
If it was a carb on a 2 stroke engine you could see how much more delicate the situation would be.
But even on a 4 stroke Ethanol can give a carb hell , if it sits very long and no starbrite startron is in it.
No two carbs are the same, Don't aske me why.

lucifer & Carboard, Thanks for the good info, I will tear it apart next friday. Sorry I took so long to reply, I had to work 12 hrs. today plus the 3 hr round trip drive. It been getting 45 to 50 some days around here and I'm ready to ride. now all I need to do is get the bike ready. I will let ya'll know what I find.
Thanks,

I had the same problem on my '90 FLTCU and it was definetly a torn diaphram.
Thing was the little O-ring that came with the kit...was the wrong size O-ring. It fit in the hole but didn't stick out above the hole so I wound up re-using the original O-ring. I don't see that as being the cause of the gas coming out the rod boot though. Only way that happens is the gas is somehow finding its way past the diaphram.

Good luck.....Mike