gurgling sound inside carburetor

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biotex
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Posts: 13
Joined: Sun Jul 01, 2012 6:27 pm
Location: Alpine, Texas

gurgling sound inside carburetor

Post by biotex »

Just started the bug for the first time since I owned it. PO had done a complete resto several years ago, so everything is in tip top shape. It is actually a 64, but don't see how that would make any difference in this case. The carb is fairly new with electric choke.

So it fires up, and sounds as axpected once she settled in. Idle was a bit low, so I turned in the adj, screw to bring it up a tad. I notice that with the fast idle cam at it lowest notch, and the choke all open, that the idle screw is maxed out all the way in, but the idle is acceptable now. Just wanted to throw that bit in in case it is pertinent.

So, I jump in, test the brakes, and head out for a test drive. I'm good all the way up to 3rd gear, then she dies. Won't restart, so I push it home. Thank goodness it was down hill to the driveway. About half way, I try the starter again, and still no start. Once I get to the driveway, I'm going to use the starter to get me over the hump. In second gear, I hit the starter, and she fires up! Into the garage, I give it a once over, and see nothing unusual. The filter is showing fuel, and she is revving good, idleing good.

So, I hop back in and go for test drive number two. Same result! This time I open the hood to take a closer look, and I hear a gurgling coming from the carb. I see a slight wetness with a drip every several seconds on the throttle cable. The screw that adjusts the idle is where the drip is.

Fuel filter is showing fuel, although it is lower than when I left the shop. The engine will not fire up. I push it home, and half way I try to start it up, and she fires up. I pulled into the shop, and parked it. I pulled the brand new oil bath filter off, and it looks fine. All hoses and parts are new from restoration a few years back. The PO was driving this bug before he passed, and it sat for 1 year.

The fuel tank was new from resto, and had about 2 gallons of fuel in it. The day before I had put a bit of fuel stabilizer into the tank, then I poured about 3 gal. of new fuel on top of it since it still smelled good. No ethanol.

I have been around carbureted engines all my life, and have never heard this gurgleing with the engine not running. Still trying to figure out if it was fuel or oil making the noise. Any ideas befor I pull the carb and rebuild?
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fatalifeaten
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Location: The 480

Post by fatalifeaten »

vapor lock? How hot's it where you're at right now? Gurgling sounds like boiling fuel in the lines, I've heard that sound before. Brosol H30/31?

Really though, if it's leaking fuel, you know the end of this story. Pull it and go through it. Make sure all the bushings are good, there's no slop or anything worn out, and rebuild it.
biotex
Member
Posts: 13
Joined: Sun Jul 01, 2012 6:27 pm
Location: Alpine, Texas

Post by biotex »

fatalifeaten wrote:vapor lock? How hot's it where you're at right now? Gurgling sounds like boiling fuel in the lines, I've heard that sound before. Brosol H30/31?

Really though, if it's leaking fuel, you know the end of this story. Pull it and go through it. Make sure all the bushings are good, there's no slop or anything worn out, and rebuild it.
It was 100°F. at the time. One minute into the test drive after a one minute warmup from a cold start. Possible vapor lock, but doubtful.

Update:
Drove it yesterday, and the thing never skipped a beat. I added it to my insurance, and got it inspected. 100% legal now!
I'm thinking the float was stuck, and the overflowing fuel was flashing. Thus the drip. Sitting overnite with the fuel treatment in the carb might have loosened it up.

Thanks for the reply!
Blue Baron
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Location: Tampa, Florida

Post by Blue Baron »

The gurgling and leakage could also be caused by a sunken float, and the stalling could be a sticking needle and seat. Clean that thing out!
biotex
Member
Posts: 13
Joined: Sun Jul 01, 2012 6:27 pm
Location: Alpine, Texas

Post by biotex »

Yeah, most definitely will pull the bowl. I'm actually trying to find a way to get the bug to Tampa. Don't really want to drive it, so am looking for someone to tow it. I have all new parts ordered for the sunroof. Soon as they are installed, it's on its way.
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