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Old 03-16-2006, 01:21 PM   #1 (permalink)
 
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Motorcraft carb drains when sitting

I just burned up starter #2 in the year since I've had my jeep! I thought I was being pretty nice to this starter, but still fried it. Somehow when it sits for more than a couple of days the gas evaporates or drains out of the float bowl. All the emissions stuff is there and the carb was rebuilt about a year ago. I don't understand how it's doing this. It's temping to put an electric pump in and bypass the mechanical, or even use an electric pump as a priming pump. There has to be a simpler solution though. Any ideas?
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Old 03-16-2006, 07:52 PM   #2 (permalink)
 
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sounds like my problem as well. anyone?
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Old 03-16-2006, 08:14 PM   #3 (permalink)
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Most fuel pumps have a check valve that keeps the fuel from draining back out of the carb and fuel lines into the fuel tank. Had this exact problem with my Ford truck, replaced the fuel pump, and it was fixed. Might be worth checking on.
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Old 03-17-2006, 12:25 PM   #4 (permalink)
 
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That's what I thought, but this one has a relatively new pump.
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Old 03-17-2006, 12:30 PM   #5 (permalink)
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Most likely has to do with the orientation of your fuel filter. You are supposed to have the one right before your carb pointed in a specific way. If I remember right you need to have the inlet of the fuel filter pointing up. There should be a hard line that is shaped to help out with this. That should prevent the fuel from draining back to the gas tank while sitting. Common problem on the Jeeps it seems.

Last edited by rockcandy; 03-17-2006 at 12:32 PM.
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Old 03-17-2006, 02:26 PM   #6 (permalink)
 
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The filter return is at 12 o'clock and it still happens. If fuel filled the return line I could see how it might siphon back to the tank, but that would happen with the return pointed in any direction. Maybe it needs some way to disrupt the siphoning.
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