Hey guys. I am having a problem with my carb on my 78 Bel air. I had to get towed home tonight because my carb was pissing out fuel around the throttle shaft. I have been chasing a fuel contamination problem and I traced it to a rusty fuel tank!, after replacing the fuel tank and flushing the lines I thought I cured the problem. But rust particles must have worked ther way into the carb, causing this problem, a stuck open needle and seat I presume! any ideas. I continued to crank the engine right after it stalled, thus the excessive fuel comming from the throttle shaft area, it was kinda hard to tell as it was night time and I was stopped in the middle of a left turn lane and fuel was boiling off the intake/ exhaust, yikes, help please!

pull the top off the carb , and suck out the crud and sediment, pull the needle and seat and clean. you can buy a cheap trash gun ,, looks like a grease gun or put a tee in an air line and use the venturi effect like a vacuum, just make sure your spraying the air nozzle away from anything and you, as it will be spraying the fuel and crud from inside the carb with the air stream. have a real good look at the needle and seat , it may be scored. Had the same thing happen to me on my old pontiac after a few years of sitting, condenstation in the gas tank caused chaos , 3 filters later , it had worked itseld through. hope that helps.

if you had rust in the tank, it will be in the carb too......have it rebuilt.

Hey thanks guys. I purchased a carb kit from good old Canadian Tire, so I am going to open er up today, couldn't ask for better weather. Would a stuck open needle and seat cause fuel to leak from the base and throtle shaft area of the carb? Thanks for all your help.

72 luxo wrote:

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Hey thanks guys. I purchased a carb kit from good old Canadian Tire, so I am going to open er up today, couldn't ask for better weather. Would a stuck open needle and seat cause fuel to leak from the base and throtle shaft area of the carb? Thanks for all your help.

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yes

 

Is it possible for a mechanical fuel pump to go bad, as in supply to much pressure, because I am having one heck of a time with my ride, my carb keep spewing fuel out evrerywhere, out the throttle shaft, out the air horn!, I just replaced the needle and seat, so I am really stuck on what to do! I was driving great and all of a sudden it stalled and flooded out like I described and it keeps doing this.