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Rubber or vinyl vacuum caps?

 
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Old 04-14-2010, 11:05 AM
1986F150six
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Rubber or vinyl vacuum caps?

When replacing vacuum caps, or deleting existing vacuum lines, which type of cap do you use? [Rubber or vinyl] The vinyl ones are different colors and less expensive.

It is interesting... the replacement rubber ones do not seem to last too long before developing cracks, but I still have an original one on the junction block on the firewall, supplying vacuum to the interior, which is still pliable and is 24 years old???
 
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Old 04-14-2010, 01:51 PM
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Originally Posted by 1986F150six View Post
When replacing vacuum caps, or deleting existing vacuum lines, which type of cap do you use? [Rubber or vinyl] The vinyl ones are different colors and less expensive.

It is interesting... the replacement rubber ones do not seem to last too long before developing cracks, but I still have an original one on the junction block on the firewall, supplying vacuum to the interior, which is still pliable and is 24 years old???
I've never seen the vinyl ones for sale, but I'll agree with you on the rubber ones. They're absolute garbage and I wish I could switch to something else. Mine's like yours. The vacuum caps I still have that came on the engine are soft and have absolutely no cracks in them and are decades old. The new ones I put on have this "shiny" look and develop cracks within a month or so, and fall off on their own after about a year. Junk, but so far I haven't found any alternatives.
 
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Old 04-14-2010, 02:53 PM
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AbandonedBronco,

O'Reilly's has both in the "Help" section.
 
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Old 04-14-2010, 04:22 PM
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If the ones on this page of McMaster-Carr are like the rest of their products, they should be high quality. McMaster-Carr I didn't check sizes.
 
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Old 04-15-2010, 07:09 AM
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what bout a glue type product (silicon cauk or something?)
 
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Old 04-15-2010, 08:46 AM
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McMasters sells really good stuff. My brother used to be an engineer for a manufacturing / design place and they pretty much exclusively used them.

I've always wondered about that though, chrlsful, since a lot of those vacuum ports will never be used, if they could just be filled. The only issue I see is that it's vacuum, so they're always sucking inwards. If the plug comes loose, it's going into your vacuum system and not popping out into the engine bay.
 
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Old 04-15-2010, 08:59 AM
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I prefer the rubber caps, but as noted, most of the newer ones are total crap. I usually end up using a short piece of hose with a plug in it after the newer rubber caps split or fall off.......

Silicone can be used, but getting the port filled and leaving a "Bubble" on the outside is the best way to do it. Still, it can come loose over time. Squirting a bit into a short piece of hose, then capping the port with that is better, as the port can be used later, if needed.
 
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Old 04-16-2010, 01:58 PM
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using a short piece of hose with a plug in it

2 of mine R just connected to each other by short hose, nother solo 1 has 1/4" hose w/lill' screw/bolt threaded into the end to block. It's a work truck (but Mon nites it DOES go to the local ice cream drive-up's summer/3 mo show n shine. I like visitin w/the 1963 289 Ranchero).
 
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Old 06-03-2010, 09:45 AM
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Just an update:

This past weekend, I removed the air cleaner and took a look at the replacement vinyl caps being tried. They look like the day they were installed. Being conservative in nature, I wish they were all black. Depending on size, they are colored black, red, white and blue. At least they are patriotic!
 
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Old 06-03-2010, 10:33 AM
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I have noticed they're pretty wildly colored. =P But hey, if they don't crack and fade, go with good ol' red white and blue.
 
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Old 10-09-2013, 10:43 AM
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Update on an old thread...

The vinyl caps are still good.
 
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Old 10-12-2013, 09:36 AM
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Auzo zone carries a packet of the vinyl caps. I have used a short piece of hose with a screw stuck in the end in the past.
 
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Old 10-16-2013, 11:28 AM
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I bought some nitrile rubber vacuum hose, cut it to short lengths, and filled in the open end with RTV to make my own vacuum caps. I also used short lengths of the hose along with some brake line to replace the factory plastic lines that kept snapping every time I touched one. The hoses have been on for several years and don't show any signs of deterioration. I got it from an online performance shop that specialized in turbo's.
 
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Old 10-16-2013, 09:54 PM
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more off topic ideas

"...used short lengths of the hose along with some brake line to replace the factory plastic lines that kept snapping every time I touched..."
Hey, great idea. I remember when they came out ford had'em all over, didn't last long. Some of the younger guys strip 'em off to "look better" & cuz "they don't serve any purpose". Nitrile seems like it'll last awhile.
 
 
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