first issue is with the 96 xcr sp running the one carb has fuel coming out of the vent tube.. the other is when not running the carbs leak gas out by the reeds... i just rebuilt the carbs.. they are all new... im stumped... could it be junk from the tank? any thoughts?

oh i forgot to specify the sled.. its a 1996 xcr 600sp.

IF YOU DID NOT REPLACE YOUR NEEDLES AND SEATS AT TIME OF REBUILD I WOULD VAC. TEST THEM FOR AT LEAST 5 MINUTES TO SEE IF THEY HOLD ,IF NOT REPLACE THEM !!!

I've found that you must pressure test the needles and seats (rather than vacuum test) in vehicle position in the sled by using a fuel line attached to each carb then filling it with fuel and pumping pressure into the line while watching a gauge to see how much pressure they will hold before leaking as well as how long they will hold pressure. Otherwise, you may miss a dragging float, high float, sunk float, IMPROPERLY INSTALLED FLOAT OR FLOAT ARM, plugged vent line, etc., etc.
Make sure that the float arm or float was reinstalled the right way or fuel level may be too high even with good float needle/seats.

If you have a plugged vent system in one or more carbs, what will happen is: As fuel enters the empty bowl, it causes an air pressure build-up inside the bowl and it will force fuel out of the jets even when the float N/S and fuel level is okay.

The needles/seat should hold up to 15 psi before leaking assuming they are stock 1.5 mm. Bigger N/S (1.8 or 2.0 mm) will hold less pressure.

Good luck.

I will pressure test the system and check for plugged vents... It has new needles and seats so we will get a answer sone about the test... i just supprised me to see it flowing out of the vent into the airbox when the the system was running.

If the machine is stored in a manner that leaves the back end more than an inch or 2 off the ground, even good needle and seats will leak..... One of the reasons for the shut off valve. There isn't much doubt about the carb with fuel coming from the vents. It has an issue. No pressure test necessary there.....