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  #1  
Old 07-05-2011, 03:33 PM
htiguy79
 
Join Date: Sep 2010
Location: san diego ca
Posts: 22
CENTRAL VACUUM LEAK-NEED A LITTLE HELP AND A DIAGRAM

NEED A LITTLE GUIDANCE TO FIND MY LEAK-
MY 1984 300D has a leak somewhere between the connector under the mat on the passenger side and the fuel door or trunk. my doors operate properly when I disconnect the yellow tube with red line that goes back to the fuel door and trunk and plug the connector under the front passenger mat. i had a good T/S guide but the wrong diagram. the diagram showed only the green line going to the fuel door. my car has both (red/green). I figured my fuel door mechanism was bad but when I plugged both lines the system still leaked. I tried the same with the trunk but also leaked. my guess is a damged yellow/red line under my rear seat?? are there any more connectors between the front mat and the fuel door or a likely place where it could have been dameged?
thanks
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  #3  
Old 07-05-2011, 07:39 PM
Yak Yak is offline
Registered User
 
Join Date: Aug 2009
Location: San Antonio, TX
Posts: 1,711
I thought locking was red, unlocking was green.

The diagrams I've seen show red going from the footwell to a Y near the filler door. Of the three lines on the Y, one comes from the footwell, one goes to the filler, the third goes to the trunk to unlock that.

The green line also goes from footwell to rear, but only connects to the trunk lock.

I'd test the filler element by itself with a Mity-Vac. If good, then reconnect the trunk and the filler red lines and plug the trunk green line near the trunk element. Apply the Mity-Vac to the third Y end on the filler Y and see if the trunk works. If so, then connect the red line from footwell to third Y end and disconnect in footwell and apply the Mity Vac there.

You are systemically testing each component.

Keep in the mind the locks need red suction to lock and green suction to unlock.
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  #4  
Old 07-05-2011, 08:34 PM
htiguy79
 
Join Date: Sep 2010
Location: san diego ca
Posts: 22
Yak,

the diagram I had was for a W123 and showed red as "unlocking" and had only a green line to the fuel door. It must have been homemade though it did help some. they were shown as solid red/green. Maybe an early W123??

I read that the fuel door y connectors go bad frequently. I will test the actuators and replace the Y connectors. Can you recommend a good place besides the dealer to buy connectors?

thanks

Quote:
Originally Posted by Yak View Post
I thought locking was red, unlocking was green.

The diagrams I've seen show red going from the footwell to a Y near the filler door. Of the three lines on the Y, one comes from the footwell, one goes to the filler, the third goes to the trunk to unlock that.

The green line also goes from footwell to rear, but only connects to the trunk lock.

I'd test the filler element by itself with a Mity-Vac. If good, then reconnect the trunk and the filler red lines and plug the trunk green line near the trunk element. Apply the Mity-Vac to the third Y end on the filler Y and see if the trunk works. If so, then connect the red line from footwell to third Y end and disconnect in footwell and apply the Mity Vac there.

You are systemically testing each component.

Keep in the mind the locks need red suction to lock and green suction to unlock.
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  #5  
Old 07-06-2011, 10:09 PM
htiguy79
 
Join Date: Sep 2010
Location: san diego ca
Posts: 22
Got it figured out

yak,

Ok it was the locking side(yellow/red-stripe) of the fuel door actuator. Tested both inlets and unlocking side held tight. Trunk held tight on both sides too. Fuel door Y connectors looked ok. I plugged and bypassed until I feel like spending $70 for a new actuator.
Thanks for all the help!!




Quote:
Originally Posted by Yak View Post
I thought locking was red, unlocking was green.

The diagrams I've seen show red going from the footwell to a Y near the filler door. Of the three lines on the Y, one comes from the footwell, one goes to the filler, the third goes to the trunk to unlock that.

The green line also goes from footwell to rear, but only connects to the trunk lock.

I'd test the filler element by itself with a Mity-Vac. If good, then reconnect the trunk and the filler red lines and plug the trunk green line near the trunk element. Apply the Mity-Vac to the third Y end on the filler Y and see if the trunk works. If so, then connect the red line from footwell to third Y end and disconnect in footwell and apply the Mity Vac there.

You are systemically testing each component.

Keep in the mind the locks need red suction to lock and green suction to unlock.
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