No fuel delivery, any suggestions?

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23 Sep 2011 19:19 #479046 by Roscoe76
No fuel delivery, any suggestions? was created by Roscoe76
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?

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23 Sep 2011 19:42 #479049 by P21
Replied by P21 on topic No fuel delivery, any suggestions?
how about blocked tank vent?

Kawasaki KZ 1000 Police (2002) P21

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23 Sep 2011 19:43 #479050 by P21
Replied by P21 on topic No fuel delivery, any suggestions?
or open your carb drain screws alittle

Kawasaki KZ 1000 Police (2002) P21

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23 Sep 2011 20:58 #479060 by Patton
Replied by Patton on topic No fuel delivery, any suggestions?

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! :)

1973 Z1
KZ900 LTD

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23 Sep 2011 22:05 #479080 by jonnybravo
Replied by jonnybravo on topic No fuel delivery, any suggestions?
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

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24 Sep 2011 03:24 #479105 by Roscoe76
Replied by Roscoe76 on topic No fuel delivery, any suggestions?
When I open the drain screws I get a very minimal amount of fuel to run to the right carb but that's it.

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24 Sep 2011 03:36 #479106 by Roscoe76
Replied by Roscoe76 on topic No fuel delivery, any suggestions?
basically fuel won't even flow into the fuel lines when they are attached to the carbs but flows fine when they are not.

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24 Sep 2011 08:12 #479123 by wireman
Replied by wireman on topic No fuel delivery, any suggestions?
soak carbs over night then blow them out with compressed air starting at the tee fitting B)

posting from deep under a non-descript barn in an undisclosed location southwest of Omaha.

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26 Sep 2011 21:43 #479813 by Roscoe76
Replied by Roscoe76 on topic No fuel delivery, any suggestions?
This was the first step I did. The compressed air flowed through perfectly. Still no fuel though.

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26 Sep 2011 21:50 #479814 by Motor Head
Replied by Motor Head on topic No fuel delivery, any suggestions?

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?

1982 KZ1000LTD K2 Vance & Hines 4-1 ACCEL COILS Added Vetter fairing & Bags. FOX Racing rear Shocks, Braced Swing-arm, Fork Brace, Progressive Fork Springs RT Gold Emulators, APE Valve Springs, 1166 Big Bore kit, RS34's, GPZ cams.
1980 KZ550LTD C1 Stock SOLD Miss it
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27 Sep 2011 03:03 #479882 by Roscoe76
Replied by Roscoe76 on topic No fuel delivery, any suggestions?
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.

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27 Sep 2011 10:06 #479912 by Patton
Replied by Patton on topic No fuel delivery, any suggestions?

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! :)

1973 Z1
KZ900 LTD
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