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Originally Posted by Al Skierkiewicz
Sanddrag,
The carb has a sump tube that runs down into the gas tank and the tube has a screen filter at the bottom. If the gas had been sitting any length of time, the screen could be gummed up. As I remember the carb kit has a new screen as well. Since there is no fuel pump, the hissing sound is the carb trying to suck gas in from the tank, or bypass air around the choke or gas evaporating when it hits the hot engine parts in the intake. Since the engine runs if you squirt gas into the carb, suspect fuel delivery. You may find a manual online if you haven't looked already. B&G may group engines by family so the entire part number will not get a hit on their site. BTW, the choke (if not manual) is designed to open shortly after start. If it does not, try holding it open with a screwdriver while you start it the second time.
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I too have a problem and mostly what has been said here has been done by me:
Problem - No fuel going from the circular fuel tank (located under the carb) going to the carb
What has been checked Thus Far:
1) Made sure the fuel line is clear and getting to the circular fuel tank through its provided fuel lines.
2) Checked and cleaned Carb and any methods that get fuel into the carb.
3) Fuel & Oil has been changed as well as spark plugs and air filters are concerned.
What HASN'T been checked:
1) Primer Button which just so happens to be built into the Carb Assy. thus if I have to replace one thing I would have to replace the entire Assy.
Fuel is going from the main tank into the circular tank just not going from the circular tank to the carb.

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Past FIRST Robotics Events that I proudly volunteered at:
FLL: NY State Competition '03
FRC: NYC Remote Kickoff '04 & NYC Regionals '04-'15 ,'10-'13 & NJ Regionals '06-'10, Finger Lakes Regional '09 & SBPLI Regional '08-'15 and the World Championship in '05 (Galileo Field) '07 (Newton Field) '09 (Practice Fields Attendant / FTA(A)), CeBIT Convention in '04 & NextFEST in '06 both held @ the Javitts Center, Monty Madness '07-'10, Panda-monium '08, B.Eruption '08 & '09, Ramp Riot '08, PARC '09 & '10, BR^2 '09 & Wol. Inv. '09 -'15
2015 FIRST Robotics Off Season Events that I hope to volunteer at:
Where is Wolcott Invitational
2015 FIRST Robotics Events that I will be volunteering at:
SBPLI Reg. & Championships
Volunteer Resume:
Alt & Lead Team Queuer, Field Repair/Reset, Field Setup/Breakdown, Spare Parts Attendant, Field Power Controller/Score Keeper, Co-Emcee & Official Scorer, Control System Advisor, FIRST Tech Advisor Assistant & recently Practice Field Attendant.