no fuel getting through

[Guest]

got a set of carbs, came with the bike (gsx1100et) been great for 13 years no problems, stripped them down and ultrasonic cleaned them so they now look nice fitted new o ring seals etc but bike refused to start,no fuel on plug checked float bowls no fuel, filled carbs up manually but bike still refused to start or even try.
borrowed another set of carbs which work fine so i know that the vacuum side of the engine/tank/tap are fine but cannot work out why no fuel getting through on original carbs even when filled with petrol??

[Agemax]

did you strip out,clean and reassemble all the choke circuits correctly? reset all the float heights?

[glenn]

yes cleaned everything thoroughly, float heights bang on all jets clean as a whistle all orifices clean and for good measure sprayed through with carb cleaner followed by compressed air. cannot work out why fuel will not flow through any carb?

[Agemax]

you say the petcock vacuum set up is ok, are you 100% sure you have it connected upto your carbs correctly? if another set works fine, but you are getting no fuel into the bowls in the set you have rebuilt, something must be wrong or different which controls the fuel supply.

[glenn]

connected both sets of carbs up exactly the same with the same pipes/same tank/same tap/same petrol cap so no ideas why fuel flows with one set of carbs but not with the other, could understand 1 carb playing up but not all 4?

[Big T]

Well, of fuel flows to one set of carbs, you can eliminate the fuel tap

New fuel line from tap to carbs?

Did you clean out the fuel connectors between the carbs?

[glenn]

fuel connectors clear, when filled manually all floats were full and float valves shut off at the correct heights but no fuel gets dragged through to the cylinders either by choke or even if spraying fuel in from back of carb hoping it would drag fuel through that way and start, compression is fine (if not why would borrowed carbs work fine).

[Agemax]

well if another set works, then common sense says there has to be something wrong with the rebuilt set. you should strip them back down again and examine them until you find the root of the problem

[glenn]

the million dollar question is where to concentrate for the root of the problem? any ideas?

[Agemax]

the carbs!!!

[glenn]

even i figured that one out but where/what in the carbs

[Agemax]

even i figured that one out but where/what in the carbs

vacuum passages, fuel inlet passages, floats and needle valves (make sure the floats are free to move up and down with the bowls on) some new gaskets can restrict float movement if you have replaced them with aftermarket items.
check also fuel and vacuum pipes for security and damage