Vaccum line question - small black one.

AbrahamLincoln

AbrahamLincoln

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ok, i think i broke a vac line - its in the upper left (passenger) side corner of my engine bay its connected to a black looking plastic mini FPR looking thing and runs inside passeneger side fender from there - through a hole the size of a fifty cent piece in fender. its a very tiny black plastic line, and it is sucking vaccuum, where does it run? its maybe a foot long from that black plastic little piece in the top left corner and hangs in my fender.
 
that is really vague...got any pictures a mark 8 is loaded with vac lines.
 
hows it vague, small black line that starts from the top left corner of the engine bay and runs into the passenger side fender - along with a fuel line or two i beleive, ill try and get batterys from my camera
 
vauge like go straight down this street till you see a black mailbox and then turn. All fords have an umptamillion vac lines. It sounds similiar to one in my Nav that runs behind the battery into a small box that I can see no function for whatsoever other than to make me take out the battery and holder to find it was nothing. But, it could be something.:shifty:
 
Man do you ever stop messin with the car? Lol JK... get some pics and lets see what we can figure out.
 
maybe its the supply line for the HVAC system, can you change the air flow from defrost? if not thats your line
 
It runs from the vacumn port @ the middle of the intake manifold, across to the passenger side firewall. From there it's split and runs to a vacumn canister, and the other side runs through the firewall and hooks to the back of the HVAC unit. Iv'e had this happen with probably 30 or 40 different VIII's that I've worked on.


EDIT........... Iv'e removed the canister from the system by hooking the Supply line from the intake directly to the Supply line to the HVAC unit. IIRC, there is nothing else on that loop.


Mike
 
so mines broken from passenger fender to the vacuum canister... where exactly is the canister? is it in the front part where the passenger side fender is? can i just get a vac line at the parts store and reconnect it with a rubber connector or do i have to replace the whole line from the canister to the split at the little black thing at the top left part of the engine bay?
 
To get to the canister, you'll have to drop the inner fender liner out. Just run a new line from the intake manifold, to the HVAC supply line, and be done with it.

Mike
 
OK, Since were bound and determined to make this harder than it has to be......


You can either pull the inner fender out and replace just that one line, or you can pull the whole fender off to get to it.

Mike
 
whats the point of the canister? if im going to delete it? will that be ok (running from the top of the intake manifold to the hvac supply line)
 
It's a intrigal part of Ford's extreme over engineering prowess. It's used to store vacumn for the Hvac unit, but I think they failed to recognize the engine is constantly producing vacumn whilst running.
 
Do you EVER just sit in the car and cycle the HVAC unit with the engine off? I don't know about you, but I VERY rarely just sit in the car and push the buttons on the hvac unit for the fun of it.
 
This is a pic of (96hotrodlincoln) that hit the deer. It might give you a better idea of what's behind the fender. Also, your defroster might switch from top to floor and vent with the car off but without the compressor running, you don't actually have the defroster function. The last time I sat in my car and pushed all the buttons on the EATC unit when the car was off was 2 years ago when I changed it over to the big button style.

Anyway, heres 96hotrodlincoln's pass fender removed.

PassSide.jpg
 
94m5 said:
It's a intrigal part of Ford's extreme over engineering prowess. It's used to store vacumn for the Hvac unit, but I think they failed to recognize the engine is constantly producing vacumn whilst running.
Click to expand...

it also prevents the vent from switching to default on long periods of WOT.

on a gas super duty this takes about 6 seconds of WOT.
 
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