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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Where does this vacuum Line go?

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Old Jan 2, 2023 | 12:35 PM
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AndynT45's Avatar
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Where does this vacuum Line go?

I have a 1991 f150 4.9 I cannot figure out where this vacuum line goes and it revs out nice but idles down really low and stumbles it didn’t do this before and I have no clue where it goes any ideas?
 
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Old Jan 2, 2023 | 12:37 PM
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The line with the Y connector? If so on my 87 4.9 it goes to the charcoal canister
 
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Old Jan 2, 2023 | 12:42 PM
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That's the purge line to the charcoal canister, as toolman said. It should not have vacuum applied to it.
 
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