1966 250se electric fuel pump - Page 5 - Mercedes-Benz Forum

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post #41 of 46 (permalink) Old 05-12-2014, 01:31 PM
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A few days passed with other things to do, but after removing the fuel guage sender unit and seeing the amount of rust in the tank I removed the whole tank. I've been working at flushing it out, but cannot quite determine if the venturi-channel to the flower pot is clear or not. My attempts to work a steel wire through the channel from the fuel gauge sender hole haven't succeeded yet. I'm assuming it must still be blocked because I only have a very slow dribble of water through the bottom plug even with the tank filled up to the top of the flower pot. But then again, the venturi channel is not very large so perhaps it should only be a dribble? Any ideas on this? Both the supply and return lines are perfectly clear.
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post #42 of 46 (permalink) Old 05-12-2014, 01:35 PM
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It's not easy to see or take a photo of, but the venturi channel is underneath the return line which is the curved, thinner tube in the second picture, the cone shaped arrangement. It obviously narrows as it enters the flower pot, but how much?

Any advise is appreciated!
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post #43 of 46 (permalink) Old 05-12-2014, 06:52 PM
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Can you use a pressure washer ir take it to a car wash? Have you removed the filter to see if it's clogged?
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post #44 of 46 (permalink) Old 05-12-2014, 09:52 PM
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The filter is out (of course!). I will try to have a look with an inspection mirror today.
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post #45 of 46 (permalink) Old 05-13-2014, 02:44 AM Thread Starter
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Mine was the same only a slow dribble from the outlet pipe which connects to the pump, I tried blowing with compressed air but I think the main problem was old fuel which had hardened restricting the flow, the return line was in a similar state.
with a clean or new filter fitted you should get a good free flow of liquid from the flower pot out of the tank outlet which feeds the pump.
mine was cleaned with chemicals / acid by a radiator shop, solved all the restriction problems.
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post #46 of 46 (permalink) Old 05-13-2014, 03:16 AM
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Thanks for the input. In my case the "apparently" restricted flow is from the main tank into the flower pot. (From the flower pot to the delivery side of the pump is ok). Will report back after having a look with a mirror.
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