[W126 Coupe] Fuel Pump

[Sharan Bains]

David,

Post 88 cars have a twin fuel pump setup, whilst earlier cars have a single 
pump set-up. So your 91 will have dual fuel pump set-up.

The twin fuel pumps are slimmer than the single pump. The fuel accumulators 
are also different.

The retaining bracket and lines are different. But I wouldn't get intot eh 
complexities of only swapping the pump. Just simply switch the entire system 
over - it's very quick and straightforward.

Remove the entire existing set-up on your 85 car, which is easy, as all you 
need to remove are the 4 10mm nuts retaining the fuel system bracket, 
discnnect the main flexible fuel line to the fuel pump and the one to the 
fuel filter. (Of course, clamp off the flexible fuel lines to prevent fuel 
pouring out from tank...)

Then, simply remove the 91 system, bolt-up to the 85 and connect the fuel 
lines, one to the back of the fuel pump and the other to the fuel filter.

You will have to create a very small loom, to power the additional fuel 
pump. Or you can cut this from your 91 fuel pump loom.

I did the above on my 1987 W126 300SE, which had a single pump system - 
fitted the entire fuel system from a 1990 300SE and it only took 30 mins. 
Benefit is better efficiency and the fact that the two pumps are independant 
- if one fails, you have another to keep you running.


For future fuel system parts, it's best to retain the chassis number from 
your 91 car.


talbir



>From: David Fatovic <coloradocroat@yahoo.com>
>Reply-To: mbcoupes@mbcoupes.com
>To: mbcoupes@mbcoupes.com
>Subject: [W126 Coupe] Fuel Pump
>Date: Mon, 27 Dec 2004 08:15:54 -0800 (PST)
>
>Is it possible to swap the fuel pump from my totalled
>91 to my running 85?
>
>David
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