Carb Drain After Shut-Off - Team Camaro Tech
Troubleshooting Diagnosing problems done here.

 
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post #1 of 12 (permalink) Old Jan 19th, 02, 03:04 PM Thread Starter
 
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The fuel in my carter carb drains into the engine everytime after I shut the car off. I've pulled the carb apart before after I've shut the thing off and can see the fuel level slowly dropping. If I wait a couple of minutes before starting her up, I have to hold the accelerator pedal down while cranking the engine to clear the motor of excess fuel. This also happened when I ran the car with a 750 cfm holley w/ vacuum secondaries (i.e., list 3310).

Has anyone had similar problems and can anyone tell me what's going on?

Rich
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post #2 of 12 (permalink) Old Jan 19th, 02, 06:03 PM
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is the float set too high?

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post #3 of 12 (permalink) Old Jan 20th, 02, 01:21 AM
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We're kinda in the dark here. Just exactly what type of carb are you running?

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STEVE JACK
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post #4 of 12 (permalink) Old Jan 20th, 02, 11:14 AM
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He said it's a Carter (Edelbrock maybe?)
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post #5 of 12 (permalink) Old Jan 20th, 02, 01:17 PM
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Cavemate......I am totally out of it, you are right....it's there.

Regardless, if it happens to both carbs it's a fuel pressure issue. The pressure is overcoming the float pressure and dumping excess fuel into the bowls then into the carb innerds!

Put a regulator in....5lbs is perfectamundo!

Nothing else is indigneous to both.

Just my two sense!

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STEVE JACK
ConceptOne Pulleys and Brackets

[This message has been edited by HOTRODSRJ (edited 01-20-2002).]
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post #6 of 12 (permalink) Old Jan 20th, 02, 01:48 PM
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Ummmm....vaporlock ??? Is it "percolating" the fuel ???.......just another thought,,,,,
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post #7 of 12 (permalink) Old Jan 21st, 02, 06:35 AM Thread Starter
 
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<BLOCKQUOTE>quote:</font><HR>Originally posted by 18436572:
Ummmm....vaporlock ??? Is it "percolating" the fuel ???.......just another thought,,,,,<HR></BLOCKQUOTE>

It's a Carter 650 cfm (or something close that that) which was specified for use on a Ford. I'll check the list number if needed.

I've used one of those cheap purolator fuel pressure regulators and switched to a two port mallory unit set at 5lbs. The problem still persist.

My friend suggested that it may be vapor lock and blocked bowl vents. I'm not convinced that that is the case because I can see the fuel level dropping when I'm fussing with the jets. I think what I need to do is check the vents then pull the carb and fill the bowls with fuel and watch what happens.

Rich
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post #8 of 12 (permalink) Old Jan 22nd, 02, 02:35 AM
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How can you see fuel in the bowl going down in an AFB style carb? I understand about the Holley!.

The boiling theory is good, but the blocked bowl vent(even tho would make sense if pressure was building in the carb bowl)would not be indigneous to BOTH carbs!

Is it possible that the regulator is not working properly? Reduce the pressure a pound or two to see what happens.
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post #9 of 12 (permalink) Old Jan 22nd, 02, 04:35 AM
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I had a Carter 625 with electric choke that was spec'd for a Ford on my Blazer. All I had to do was change the jetting a little and it ran fine. The only difference was the throttle linkage connections.

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post #10 of 12 (permalink) Old Jan 22nd, 02, 12:39 PM Thread Starter
 
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<BLOCKQUOTE>quote:</font><HR>Originally posted by HOTRODSRJ:
How can you see fuel in the bowl going down in an AFB style carb? I understand about the Holley!.<HR></BLOCKQUOTE>

With the top of the carb removed, you can see the fuel level slowly drop. It just a guess, but I figured the fuel was draining down into the intake manifold.

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post #11 of 12 (permalink) Old Jan 23rd, 02, 01:00 AM
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Well, since the carb feed line is divorced from the bowls since you have the top off, the only place the fuel has to go is into the intake if indeed the fuel is leaking out of the bowl.

I don't know what the heck is going on and for BOTH of the carbs that you have to do this is.....well, unbelieveable to say the least. Each of the carbs have completely differing ways of moving fuel and storing it as well, yet the complaint is about the very same thing?

If this were fuel perculation you would readily see it in the bowls, and the fact that you have the TOP OFF elimates fuel pressure and bowl vent issues. So, frankly I am out of answers. I am not sure that each carb has an indigneous problem all it's own and one might think it's the same?

Let us know if and when you figure this mystery out?

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post #12 of 12 (permalink) Old Jan 23rd, 02, 06:33 AM Thread Starter
 
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<BLOCKQUOTE>quote:</font><HR>Originally posted by HOTRODSRJ:
I don't know what the heck is going on and for BOTH of the carbs that you have to do this is.....well, unbelieveable to say the least.<HR></BLOCKQUOTE>

This leads me to believe that my observation of what's going on must be incorrect. I'll double-check to make sure that what I've described is actually happening.

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