Have a Gilera DNA 50 that was running fine. It ran out of fuel, now cannot seem to get constant flow back to the carb. Took carb off and cleaned, air filter cleaned, pulled fuel vacuum tap out of the bottom of the fuel tank and blew out with air compressor, cleaned. Put vacuum tap back on.Took fuel pump off and cleaned insides and remounted. Replaced fuel hose from vaccuum tap to fuel pump. Cleaned out vacuum line from carb to vacuum pump. Primed line from fuel pump to carb. Used a shop vac to open tap value and saw fuel runing from vacuum tap to fuel pump. Can see fuel running from vacuum tap to fuel pump and fuel pump to carb when the bike is started...but not a constant stream and has air bubbles in it. Bike starts and runs for a while then is starved of fuel and cuts out. Can't figure out what else could be wrong? Is it something with the carb float getting stuck?