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How did you guys managed to remove the fuel filter? I can't remove it. Tried most methods, but its not coming out... (the spin on one) Any special tools needed?
 

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1991 300 SE
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18,534 Posts
If you have a diesel it’s really not a ‘spin-on,’ use a wrench or large socket to remove the bolt on top, then it will drop down.
 

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1959 220S cabriolet, 1983 240D original owner, 1999 E300 turbo diesel, 1988 560SL, 2003 SLK320
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3,513 Posts
If the hand pump is leaking, it needs to be changed.

Len
 

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W140 S600 300D300SD
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hello i also had that leakin the handprimer pump, u can change it into the metal one that is a heavy duty primer pump made in japan, i had mine replaced w/ the heavy duty one and it still works fine after 4yrs now and still going w/ no leaks and easier pumping.
 

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1991 300 SE
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No, the pump is used to remove air from the system – you leave the maim spin on filter loose and pump the pump until the fuel comes out of the top of the main filter, there will be bubbles in the fuel. You then tighten the main filter and the engine will fire right up. I suppose if you pump the pump with the system closed and the pump is leaking fuel will come out of the pump.
 

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1984 300CD, 1983 240TD Euro
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I'm not going to tell you how to do your job, but I've change injectors and filters and hand pumps and return hoses several times on several vehicles and never had to loosen the filter or injector lines to get the air out. Lucky? I read somewhere the the air goes out through the by-pass back to the tank. I do fill the filter (can Type) with ATF B4 install.[8D]
 
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