Problems with afb?
Thread Starter
Instructor
Joined: Jul 2008
Posts: 233
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From: Acworth GA
Problems with afb?
New to me 62 and having some issues. Carb keeps going dry on me. Try to start and nothing, no visible fuel squirting. I can get it running if I nurse it with squirting some fuel down the carb. After its going, it's fine until I shut it off and let it sit for a a couple of minutes. Go to start, it will fire up but quickly runs out of fuel. Carb issue? Fuel pump? Ideas?
Thread Starter
Instructor
Joined: Jul 2008
Posts: 233
Likes: 1
From: Acworth GA
Found contributing factor today. Little fuel getting to carb. Went to change pump and found that the pivot, on the pumps lever, had worked its way out approx 75%. Still doesn't explain why fuel bowls are dry.
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From: northern california
C2 of Year Finalist (track prepared) 2019
Jim
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From: Central Arkansas
New to me 62 and having some issues. Carb keeps going dry on me. Try to start and nothing, no visible fuel squirting. I can get it running if I nurse it with squirting some fuel down the carb. After its going, it's fine until I shut it off and let it sit for a a couple of minutes. Go to start, it will fire up but quickly runs out of fuel. Carb issue? Fuel pump? Ideas?
Of course if the float is stuck or the pump is preventing the bowl from filling, the accelerator pump would be shooting blanks also.
Thread Starter
Instructor
Joined: Jul 2008
Posts: 233
Likes: 1
From: Acworth GA
Sounds to me like a bad accelerator pump if there is no visible fuel squirting just a short time after the car has run. Either that or an extreme case of fuel percolation in the fuel bowl.
Of course if the float is stuck or the pump is preventing the bowl from filling, the accelerator pump would be shooting blanks also.
Of course if the float is stuck or the pump is preventing the bowl from filling, the accelerator pump would be shooting blanks also.
It's a stock 327/340. Doesn't look like much room to put a fibre carb spacer on. Any idea what might help with the percolation?
Thread Starter
Instructor
Joined: Jul 2008
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From: Acworth GA
Race Director
Joined: Feb 2007
Posts: 15,413
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From: northern california
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The problem with AirTex pumps is a design issue.
That pivot pin is pressed into soft metal which will always creep in such a direction as to relieve any applied stress..... such as from a press fit part. One good solution would be for them to get rid of the press-fit pin and replace it with one retained by "E" clips. It will cost a little more but the failures will stop.
BTW, I suggest focusing your energy on replacing the fuel pump before spending any time diagnosing a carburetor problem. My hunch is that once your pump works properly, your other problems will cease to exist.
Jim
That pivot pin is pressed into soft metal which will always creep in such a direction as to relieve any applied stress..... such as from a press fit part. One good solution would be for them to get rid of the press-fit pin and replace it with one retained by "E" clips. It will cost a little more but the failures will stop.
BTW, I suggest focusing your energy on replacing the fuel pump before spending any time diagnosing a carburetor problem. My hunch is that once your pump works properly, your other problems will cease to exist.
Jim
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