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post #1 of (permalink) Old 10-09-2000, 07:58 PM
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vacuum leak

I've got a '71 800b all wheel drive with a 304. After sitting around for a couple of months it developed a problem in which, after running for about 15 seconds, it would rev itself up and cut off. I had the carb professionally rebuilt and tuned to factory specs, but it still did it. I've been told that its a vacuum seal leak. However, no one has offered any suggestions on how to find in and fix it. I can do most all work on my scout but I don't want to start taking apart a 30 year old engine unless I know what I'm looking for. Any suggestions?

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post #2 of (permalink) Old 10-10-2000, 12:16 PM
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Re: vacuum leak

The trick to finding vacuume leaks is to spray break cleaner where it is possible to have a leak, hoses, intake, carb. With the engine at a steady idle the break cleaner would get sucked into the engine and cause a stumble. You can use this method to zero in on where the leak might be.

Kent

If your not living on the edge, you're taking up too much space.
post #3 of (permalink) Old 10-10-2000, 03:49 PM
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Re: vacuum leak

Yes but I have always used carb cleaner and it will run rich when it is sucked in I would check the fuel pump pressure too

Bindernut
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post #4 of (permalink) Old 10-10-2000, 06:40 PM
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Re: vacuum leak

it's not what you squirt as much as listening what the engine does when the vaccume leak pulls in some different stuff. break cleaner is just safer to use.

If your not living on the edge, you're taking up too much space.
post #5 of (permalink) Old 10-11-2000, 04:16 AM
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Re: vacuum leak

Yes thats true it is safer, But I live on the edge, carb cleaner is cheaper, but then I gusse you could use water too>

Bindernut
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