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Old 12-25-2002, 08:26 PM
Registered User
Join Date: Feb 2002
Location: queens,new york
Posts: 335
central locking system/450sl

My locking system works partially. It will lock both doors but will not lock the gas flap. How can I test it. If this is a vacuum leak will it affect the engine idle. Thanks.
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Old 12-26-2002, 09:17 AM
Super Moderator
Join Date: Apr 2000
Location: Falls Church, VA
Posts: 5,315
Most likely the gas door element has gone south. Much less likely is that the line leading to it has a leak or a coupling has slipped off. I would start by disconnecting the line and using a vacuum pump to see if the element holds a vacuum.

If the door locks still work, it is probably not affecting the engine.
Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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