vacuum hose question - Ford Mustang Forum
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post #1 of 8 (permalink) Old 09-14-2019 Thread Starter
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vacuum hose question

So on my son's 91 Mustang (5.0L/LX), the vacuum port on the front of the intake, the one pointing directly at the distributor cap, disintegrated. What i observed was that that the barbed steel pipe on the intake is a lot larger diameter than the plastic connector barb sitting at the base of the distributor. The vacuum line is part of the EVAP system. Is there a special Ford hose part part number? I bought a foot of Gates part 27044 (1/4" ID vacuum hose), and though it fit fine around the plastic connector barb, it was a supreme struggle to get onto the metal barb at the intake (tucked down in the damn tunnel). Please let me know what folks do for this line - I know an easy fix would be to buy 5/16" ID line and then buy a step down plastic barb, but I don't think that's what Ford had in mind.



Thanks in advance for the help.



RT


1995 Impala SS. 396 LT4 intake and heads, with GM/Crane 847 Cam. Tri-Y headers. T56 6 speed conversion. 4.56 gears. 58mm TB (Holley) with RAISS intake. Cat delete. OBD2 PCM. Bryan Herter Programming (custom).
1990 Mercury Grand Marquis. Cold air intake. 3G alternator upgrade. Bone stock otherwise...
1974 F-100 with 390 HP (from 66 Fairlane GT).
1991 Ford Mustang LX, 5.0L, Bone Stock
1996 Buick Roadmaster. LT1. Bone Stock
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post #2 of 8 (permalink) Old 09-15-2019
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This should help.

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Mustang Monthly Jan 2015- Feature
5.0 Mustang & Super Fords July 2005
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post #3 of 8 (permalink) Old 09-15-2019 Thread Starter
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Thank you very much! Nice diagrams. So the 1/4” hose from the canister is good and connects fine down at the canister and valve. Up around the base of the distributors is a plastic barb connector (1/4” to 1/4” I think). But the barb coming out of the intake is at least 5/16”. So many be Ford made a hose running between intake and connector at base of distributor with two different diameters. There is no way you can push a 1/4” diameter hose onto that steel barb. Anyone know??

1995 Impala SS. 396 LT4 intake and heads, with GM/Crane 847 Cam. Tri-Y headers. T56 6 speed conversion. 4.56 gears. 58mm TB (Holley) with RAISS intake. Cat delete. OBD2 PCM. Bryan Herter Programming (custom).
1990 Mercury Grand Marquis. Cold air intake. 3G alternator upgrade. Bone stock otherwise...
1974 F-100 with 390 HP (from 66 Fairlane GT).
1991 Ford Mustang LX, 5.0L, Bone Stock
1996 Buick Roadmaster. LT1. Bone Stock
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post #4 of 8 (permalink) Old 09-15-2019
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Buy a very short length of 5/16 vacuum hose put that on the one end of the intake put the reducer on the other end and then run your vacuum line from the reducer to the Charcoal Canister

Reducer ........https://www.amazon.com/Stainless-Ste...D5DYKJ67VSKE4E

They also make plastic reducers for a fraction of the cost.
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Mustang Monthly Jan 2015- Feature
5.0 Mustang & Super Fords July 2005
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post #5 of 8 (permalink) Old 09-15-2019 Thread Starter
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Thanks. Yes, I saw that on amazon. Years ago remembered buying some plastic ones, but looking on Dorman and Disco websites, they don’t seem to make a 5/16 to 1/4.

1995 Impala SS. 396 LT4 intake and heads, with GM/Crane 847 Cam. Tri-Y headers. T56 6 speed conversion. 4.56 gears. 58mm TB (Holley) with RAISS intake. Cat delete. OBD2 PCM. Bryan Herter Programming (custom).
1990 Mercury Grand Marquis. Cold air intake. 3G alternator upgrade. Bone stock otherwise...
1974 F-100 with 390 HP (from 66 Fairlane GT).
1991 Ford Mustang LX, 5.0L, Bone Stock
1996 Buick Roadmaster. LT1. Bone Stock
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post #6 of 8 (permalink) Old 09-16-2019
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I forgot to mention that the original rubber 1/4 inch hose had a flared end that slipped over the 5/16 metal tube on the intake.

You might try putting the rubber hose end in hot water for a few minutes then slide a pair of needle nose pliers in the end and see if you can flare the end to the 5/16 diameter.

Mustang Monthly Jan 2015- Feature
5.0 Mustang & Super Fords July 2005
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post #7 of 8 (permalink) Old 09-16-2019 Thread Starter
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That’s the ticket! I thought was maybe the case.

1995 Impala SS. 396 LT4 intake and heads, with GM/Crane 847 Cam. Tri-Y headers. T56 6 speed conversion. 4.56 gears. 58mm TB (Holley) with RAISS intake. Cat delete. OBD2 PCM. Bryan Herter Programming (custom).
1990 Mercury Grand Marquis. Cold air intake. 3G alternator upgrade. Bone stock otherwise...
1974 F-100 with 390 HP (from 66 Fairlane GT).
1991 Ford Mustang LX, 5.0L, Bone Stock
1996 Buick Roadmaster. LT1. Bone Stock
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post #8 of 8 (permalink) Old 09-16-2019
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Here's a short video on increasing the size of a rubber hose tat might be of some help.


Mustang Monthly Jan 2015- Feature
5.0 Mustang & Super Fords July 2005
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