Fuel Filter 1975 450SL - Mercedes-Benz Forum

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post #1 of 5 (permalink) Old 06-07-2007, 02:20 PM Thread Starter
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Fuel Filter 1975 450SL

Hey out there. Am trying to help out my father with his 1975 450SL Roadstr. It had been sitting at someones house for a couple of years and I just picked it. Was funny but it started up and ran long enough for me to get it on the trailer to haul to my house. To make a long story short when I start it now the whole engine shakes and there is zero power. Totally starviong for fuel. I'm assuming the pump is workling. I was thinking that it just might be as simple as the fuel filter (hoping) getting complety cloged with old gas. My fist step was going to drain the tank of old gas and replace the fuel filter.

My question is, Where is the Fule Filter and will I need to drop the tank to get to it? And are there any special tools I will need to do what sould be a simple job. I just did the Fuel pump on 99 Ford expedition. So now I'm thinkning I can do this! Any help would be great thanks, Dan
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post #2 of 5 (permalink) Old 06-07-2007, 05:59 PM
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The fuel filter is mounted on a bracket together with the fuel pump behind the right rear wheel. The tank can stay put. The only special tool you will need is a hemostat (or something like it) to crimp the fuel lines.

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post #3 of 5 (permalink) Old 06-07-2007, 07:04 PM
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In addition to what Ike offered, there is a screen inside the fuel tank that is an even more likely source of your problem than the filter, IMO. Follow the hose up to the tank and remove the fitting to discover a washable screen hidden within the tank. BTW, welcome to BenzWorld!

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post #4 of 5 (permalink) Old 06-08-2007, 09:54 AM
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As already stated, you'll need to crimp the fuel lines to avoid spilling fuel everywhere when you disconnect them. I recently replaced my fuel pump, filter and changed the screen at the fuel tank outlet and discovered that the fuel lines were rotted and they split when I clamped them tight, resulting in gallons of fuel on the ground (and in my hair and clothes).

If your car has been sitting for a couple of years, it's possible the gas in the tank has deteriorated and is the major cause of the engine running poorly. If you drain the tank at the same time you replace the filter (and fuel lines, if necessary), then you fix two potential problems at once.
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post #5 of 5 (permalink) Old 06-08-2007, 10:37 AM Thread Starter
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OK Great!

I'll check it out! Thanks for all your help. I'll post when I find out more. This is awesome this internet thing! LOL
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