Carburator bubbling gas?
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Fleet Mechanic
Joined: Aug 2009
Posts: 1,771
Likes: 9
From: Western Washington
Carburator bubbling gas?
Howdy all, I'm having some carburetor bubbling gas problems, it happens whenever I start my truck, and after a few revolutions of the motor gas starts to bubble out of the top of the carb. I have just done a carb kit on it (my first carb kit, by the way) and I've had the carb on and off since I discovered this problem at least a dozen times. I'm guessing its the needle valve, but I've messed with it to no end, and finally replaced it last night, but the problem continues. Here's a picture, I circled the areas where the gas bubbles out in red. The carb is a Motorcraft 2100-D and its on a 390 in my 173 f250, but, the motor isn't original to the truck, and the carb probably isn't either.
Has anyone else had this problem? Also, I need a fix soon, the county has decided to gate off the alley where the truck is parked, they have the gates up, they just haven't closed them yet, so I need to be able to get this thing out of there.
Sam
P.S. Just in case anyone needs to know, the original reason I did a carb kit was because it was leaking from the gaskets in the throttle linkage and on bottom of the carb.
Has anyone else had this problem? Also, I need a fix soon, the county has decided to gate off the alley where the truck is parked, they have the gates up, they just haven't closed them yet, so I need to be able to get this thing out of there.
Sam
P.S. Just in case anyone needs to know, the original reason I did a carb kit was because it was leaking from the gaskets in the throttle linkage and on bottom of the carb.
Thread Starter
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Fleet Mechanic
Joined: Aug 2009
Posts: 1,771
Likes: 9
From: Western Washington
Boy, do I feel dumb, I just took a real close look at that parts diagram, and I've lost a spring. No new one in the carb kit either, or if there was, I must've lost it too. The spring is the one that is mounted on the float's pivot and makes the needle valve seat. Well, how exactly do I go about finding a new one? Buy a junkyard carb and take it off of that?
Thanks,
Sam
Thanks,
Sam
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
That spring is to keep the carburetor from flooding out on inclines. It's for off-road use; you don't need it for normal operation. You can get by without it, and it's not the source of your flooding problem.
Thread Starter
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Fleet Mechanic
Joined: Aug 2009
Posts: 1,771
Likes: 9
From: Western Washington
Well, thanks for your suggestions, but for a temporary fix I made my own spring out of a paper clip. I figure the springs purpose is to keep the float, pivot and the needle valve from rising too much, and my paper clip does the job. At first I wasn't too sure about it, but it worked, and no more gas is bubbling out of the carb! I even went for a short drive around the block, everything worked great. However, I do plan on getting a junker carb and pulling a spring off of it the first chance I get.
Sam
Sam
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