carb problems
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Junior User
Joined: Apr 2013
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carb problems
i have a 77 ford f100 the idle screw is turned all the way in and its idling high,also sounds rough.i recently replaced the gas tank with an older tank behind the seat kind now located in the bed behind the cab dont know if that has anything to do with the idle
Senior User
Joined: Mar 2004
Posts: 280
Likes: 2
From: Alabama
You might want to specify exactly what engine/carb setup you have in order for someone to provide some accurate information and troubleshooting procedures. Also, explain what you have done, did this problem all of sudden start, did you inherit it, etc... But usually this is sign of blown power valve in the carb given that the timing is at least close and there is no binding in the linkage... But again, it's hard to tell based on your very brief description.
Senior User
Joined: Aug 2004
Posts: 389
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From: Nassau Co. NY
Is the screw all the way in or all the way out? If the throttle lever is not resting on the screw because the screw is backed completely out its all the way out you probably have a vacuum leak.
Was the replacement tank new?
Was the replacement tank new?
Thread Starter
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Junior User
Joined: Apr 2013
Posts: 59
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carb problems
the idle screw is turned all the way in and no the tank was used had to clean it out.i have a glass filter with a screen inside to catch particles.the rubber fuel line attatched to the line from the tank fits loose should i get a tighter line?
Senior User
Joined: Mar 2004
Posts: 280
Likes: 2
From: Alabama
I guess I've had different experiences with vacuum leaks. Mine either idled rough or not at all. Never had a high idle. You can get an inline fuel filter for about $4 at any of the big parts store and put it between your pump and carb.
What kind of carb do you have?
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
If your fuel line is loose, OF COURSE you should fix it. I'm surprised fuel is not spraying everywhere.
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