this is drivin me nuts.ive replaced every part of this carb and tuned till my fingers bleed,got it ideling perfect,great response and runs smooth down the road but then after a while when i accelerate it blows gas out the front vent.fuel pressure is steady at 6lbs.if i let it sit for a while it runs fine again for a while.

Sounds like maybe the floats to high but I need more informaiton. What kind of carb?

oh yeah,its a 850 dp i check the float level after this happens and its perfect.

I would try taking the front float down a little. I will admit for years I ran mine higher than what they are suggesting. If you have sight glass the level should be below half.

try another fuel gage. what kind of regulator?

check to see if the float may have a hole in it. has to be pressure,float issue. not a lot more it can be.

Needle and seat...been there...got the T-shirt.

ive seen it many times where the vent baffle droops a little and contacts the float when you try and set it to the correct level.

try setting the float about 1/2-3/4 of a turn lower than the "correct" height to see if it eliminates the flooding condition you're having.
if this fixes the problem, you need to tweek the vent baffle upwards a bit.
i find that shortening the baffle can help in this situation as well.

ive also found that the nitrophyl or brass floats are less likely to experience this issue than the plastic floats(which have much more flexible arms).

if that doesnt do it, then it really either has to be a needle and seat, or needle and seat o-ring, or the regulator is malfuctioning.
if the regulator is old, the diaphragm may be dried out and stiff.

definitely change the needle and seat, I've been there with Eric, seen it, done it

no liq.gage,it has new needle and seat.the pressure stays steady.its gotta bee somthing with the float hangin up.

I would look at a bent float.

there can be dirt in the line.flush the line.

Don't know if this helps, but "tyranny" has two "n"s.

welli took it apart again for the umteenth time and still remained baffled,ive never been baffled like this before,this has got to be one of the most baffling things ive ever seen.then finally some one mentioned baffle and thats the only thing on this carb that i didnt look, at or replace and sure enough it was pointing down just enough so that after everything got good and hot it would hold the float open.i turned it upside down and put every thing backi together and i am no longer baffled.thanks all for your help it could of been any or all that was sugested.But Dwayne gets the cigar.