280se fuel from tank to pump - Mercedes-Benz Forum

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post #1 of 3 (permalink) Old 11-29-2012, 06:11 PM Thread Starter
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Date registered: Nov 2012
Vehicle: 1973 280se 4.5
Location: north florida
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1973 280se 4.5???

Hello ben280 here my 1973 280se is new to me. I have been haveing fule delivery problems. I dumped the gas and checked the strainer in the tank not bad at all. The fule pump and filter have less than 600mi. Put on befor I got the car. This is my ? the pump has a very small fine mesh strainer, in line it was full of very fine dusty stuff. The way they ran the fule line it goes from the tank into the pump befor the fule filter that shares the same bracket this can't be right??? I would think the fule line would go through the filter befor the pump ?? please step in and tell me what you think thankyou. Ben280 out.

Last edited by benjamin280; 11-29-2012 at 08:03 PM. Reason: trying to be clear
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post #2 of 3 (permalink) Old 11-29-2012, 07:01 PM
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The real fuel filter is in a canister attached to the engine mount under the injection pump. Don't confuse it with the oil filter attached to the block. It's a paper element and be careful, the canister is full of fuel. Check all fuel line rubber hoses for deterioration.

Near Manassas Va. '65 220S, 2006 Ford Crown Victoria Police Interceptor, '99 Volvo V70, '72 350SL 4 speed

Not part of the in-crowd since 1952. It's BRAKES not breaks. You break a bone, use brakes to stop your car. /rant

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post #3 of 3 (permalink) Old 12-01-2012, 05:02 AM
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You don't filter the fuel before the pump because the fuel acts as a lubricant and heat removal system. A dry pump will overheat and seize. The strainer in the tank is sufficient to keep the large chunks out of the fuel system. The filter is to keep the injection system clean.

It's different than a mechanically operated fuel pump system where the pump is only active while the engine is turning.
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