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Old 05-30-2002, 03:09 PM
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vacuum question...

The tailgate on my 300td locks and unlocks inconsistently. Does engine speed generate the vacuum? Is it possible that driving short distances will not generate and store enough "vacuum" to fully operate the rear hatch?

My next experiment would be to take a highway trip and see if it functions then...

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Old 05-30-2002, 04:30 PM
Registered User
Join Date: May 2001
Location: Michigan
Posts: 1,373
I would rather think that its a leak somewhere. Mine was real inconsistent until I discovered some leaks elsewhere in the system.

'84 300DT 298k (Aubrey's)
'99.5 Jetta TDI IV 251k (Julie's)
'97 Jetta TDI 127k (Amber's)
'97 Jetta TDI 186k (Matt's)
'96 Passat TDI 237k (Don's
'84 300D 211k Mint (Arne- Undergoing Greasecar Conversion)

'82 240D 229k (Matt's - Converted-300DT w/ 4 speed
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Old 05-30-2002, 06:20 PM
Eberhard Weilke's Avatar
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Join Date: Mar 2002
Location: Stuttgart, Germany
Posts: 637

Shouldn't be a problem related to engine speed. As soon as the engine runs you should have enough vaccum.

You problably have a problem with a leak in the system. I would start checking the system at the lock which is the slowest. In your case the tailgate.

When you hear the air after the system has been engaged, you found the leak. At my car it was the lock for the fuel door.

Have fun

Kind regards
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Old 05-31-2002, 08:50 AM
Ron G.
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As said already, vacuum from the pump will be there right after the engine is fired up. If you do not already have one, get a hand vacuum pump / tester and go after the lock system. You will most likely find that the gate lock element is the culprit from what you have described.

The lock system should maintain vacuum for a good long time and allow you several lock/unlock cycles.

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