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  #1  
Old 09-26-2003, 08:50 PM
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PSE Pump Part Question

I purchased a replacement PSE/Central Locking pump for my 92 400se and was told the old PSE pump had been replaced by a new part number. See Pic's below. I would be greatly appreciative if someone could help clarify if the new part will in fact fit. Since the "hose module" will not fit on top of the new part, do I also need this new part too?

Thanks in advance for any help.

Russell
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PSE Pump Part Question-pse-old-new.jpg  
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  #2  
Old 09-26-2003, 08:51 PM
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Old Pump and Old Hose Connectors
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  #3  
Old 09-27-2003, 09:24 AM
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I went to the MB dealer yesterday and parts department was stumpted on the replacement too. This is the correct part for the update, but no one is sure what else is needed.

Last edited by rsmcmahon; 09-28-2003 at 03:34 PM.
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  #4  
Old 09-28-2003, 03:38 PM
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Unhappy

Has no one else come across the PSE pump update before.
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  #5  
Old 09-30-2003, 05:29 PM
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I found his post from w140Gill. if others are interested.

I opened the package and examined the new pump. It looked considerably different to the older one. The old pump (p/n 140.800.19.48) had 15 hoses, which plugged directly into the pump. This newer design pump had only 6 input connections.

This MOD kit consist of
about 3ft of vacuum hose
2x 6 way connectors
6x 1 way straight connectors
2x 2 way connectors
4x vacuum plugs

Mercedes Benz Bulletin fitting procedure
The newer pump (p/n 140.80.28.48) has been standardized with connections for all the various accessories. This eliminates the need for different pumps for each model. Vacuum plugs are supplied to cap any connections in case the vehicle is not fitted with a particular accessory.
The connectors on the old hoses are the incorrect gender to fit the newer pump.
The service bulletin supplied, advises to cut the old connecter off and replace with the a new connector of the correct gender The two six way connectors require you to use a 12inch length of vacuum hose between the connector and the pump.
I found that new connecters did not fit at all well on the old hoses. The problem was that the hoses we not have a big enough diameter to slip over the new connector. I tried using lubricants, and a heat gun to no avail. I gave up after a few hours trying and used one inch lengths of vacuum hose connecting between the connector and the hose.
The vacuum lines are grouped together as follows:
Clear = Vacuum supply from engine (1) to fit to a one way connector
Black = trunk handle eject/retract (1) to fit to a one way connector
Red = Rear parking aide antennae (2) to fit to the two way connector
Yellow = Central locking (6) to fit to the six way connector
Grey = Front seat lumbar (3) to fit to the six way connector with 3 vacuum plugs
White/blue = Rear headrests (2) to fit to the two way connector
Once these are all connected to the pump plug in the power and it should all start working, as it should again. Even my saggy front seats filled with air again after being out of action for some months before my pump failed outright.
If anyone has a failed pump and wants to retract a particular accessory, disconnect the clear hose and link it directly to the hose of the accessory you want to operate with the engine running. I found the useful to retract my parking aides and trunk handle, which were stuck in the 'out' position for a few weeks before the repair.

Last edited by rsmcmahon; 09-30-2003 at 06:19 PM.
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  #6  
Old 10-01-2003, 02:57 PM
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I purchased the parts and followed the information supplied by W140Gill and the PSE/Central Lockking pump works GREAT!
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