No fuel delivery, any suggestions?

I recently resealed the inside of the tank of my 76 kz400. I was tired of getting rust sediment or whatever pulled into my carbs. Now I'm not getting fuel delivery to the carbs. I cleaned the filter in the petcock when doing the reseal, gave the sealant plenty of time to set, and I get a perfect steday flow of fuel when the tank is not hooked up to the carbs. I have taken apart, soaked and cleaned all the jets, needle and inside of the carbs 3 times now.
I'm stumped, any ideas?

how about blocked tank vent?

or open your carb drain screws alittle

Roscoe76 wrote: I recently resealed the inside of the tank of my 76 kz400...not getting fuel delivery to the carbs....get a perfect steday flow of fuel when the tank is not hooked up to the carbs. I have taken apart, soaked and cleaned all the jets, needle and inside of the carbs 3 times now.
I'm stumped, any ideas?

Does this mean fuel flow is reaching the tee inlet at carbs but not flowing from the tee inlet into either carb past the float valve into the float bowl?

Perhaps the tee joint is full of crud and disallowing fuel flow to either carb.

With some carb designs it's possible to install the floats upside down, which might possibly hold the float valve closed (just guessing).

Good Fortune!

to check Patty's suggestion, open a drain screw on the carb bowl and open the petcock, if no gas then start backtracking, if there is gas the possibly the vent issue

When I open the drain screws I get a very minimal amount of fuel to run to the right carb but that's it.

basically fuel won't even flow into the fuel lines when they are attached to the carbs but flows fine when they are not.

soak carbs over night then blow them out with compressed air starting at the tee fitting

This was the first step I did. The compressed air flowed through perfectly. Still no fuel though.

Patton wrote:

Roscoe76 wrote: I recently resealed the inside of the tank of my 76 kz400...not getting fuel delivery to the carbs....get a perfect steday flow of fuel when the tank is not hooked up to the carbs. I have taken apart, soaked and cleaned all the jets, needle and inside of the carbs 3 times now.
I'm stumped, any ideas?

Does this mean fuel flow is reaching the tee inlet at carbs but not flowing from the tee inlet into either carb past the float valve into the float bowl?

Perhaps the tee joint is full of crud and disallowing fuel flow to either carb.

With some carb designs it's possible to install the floats upside down, which might possibly hold the float valve closed (just guessing).

Good Fortune!

Remove a bowl, and then see if the fuel flows. Might the floats be Upside Down? As Patton suggested?

I removed a bowl,fuel flowed but the floats were definitely right side up. They can be installed upside down but, as patton said,they hold the float valves closed. When I put the bowls back on, no flow again.
I didn't think about it before, since I always previously had taken the carbs off the bike to disassemble them, but is it possible that the fuel flow is pushing the float valve out of it's seat and causing it to close once it runs into the float's tang plate?
Also, I noticed when I removed the right bowl, I heard a slight hiss of air release as the bowl seal separated from the carb body.

Roscoe76 wrote: ...floats...hold the float valves closed. When I put the bowls back on, no flow again....

The float mechanism isn't supposed to hold the fuel valve closed until the float rises sufficiently while immersed in gasoline already filling the bowl.

Would suspect the float tang is maladjusted whereby it's holding the float valve fully closed regardless of whether there's any gasoline in the bowl.

Before re-adjusting the float tang, should be absolutely positive that the floats aren't upside down.



Good Fortune!