suppressing a fuel tank on c240 2003 - Mercedes-Benz Forum

 
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post #1 of 7 (permalink) Old 03-03-2009, 08:59 AM Thread Starter
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suppressing a fuel tank on c240 2003

Hello:

I am the owner of a C240 2003 4-matic. For the second time I am having problems with the fuel level sensors which are incorporated into the fuel pumps. That fact (that you cannot buy the fuel level sensor separately), plus the fact that this car has 2 fuel tanks, makes this fuel indicator problem a very pricy one and makes wonder why in the world Mercedes benz, in all its wisdom, did these 2 very stupid things:

1) Incorporate the fuel sensor INTO the fuel pump (so that you cannot replace it unless you replace the whole fuel pump) and
2) To make matters worse, put 2 (TWO) fuel tanks in the darn thing.

So, I ask: what happens if I suppress one of the tanks? will it work still?

Please advice.

Luis
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post #2 of 7 (permalink) Old 03-03-2009, 09:48 AM
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The sensor is part of fuel pickup in cars for last 100 years.
It is not that you can't replace the sensor alone. It is that MBUSA doesn't want you to buy small parts. When I had CV joint going back on my 4-Matic I had to buy whole $1200 axle. Check ebay for discount pump.
I never relay on fuel gauge while going low. Most of the cars will drive for 70 miles with the gauge showing 0, while old Volkswagen would make 130 miles. I reset daily meter at fill up and fill up by it
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post #3 of 7 (permalink) Old 03-03-2009, 11:01 AM Thread Starter
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so what is the consequence of just using one fuel tank?
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post #4 of 7 (permalink) Old 03-03-2009, 05:30 PM
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why?
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post #5 of 7 (permalink) Old 03-05-2009, 08:51 AM Thread Starter
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like I said above. I don't want to have to replace BOTH pumps again. Can I just supress one of the tanks? or what happens if I replace just one pump?
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post #6 of 7 (permalink) Old 03-05-2009, 09:50 AM
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How do you know you have 2 pumps?
I don't know your model, but haven't hear about twin tank with 2 pumps in it. Usually the electric pump is one tank and uses venturi effect of returning fuel to suck the fuel from the second tank to the first one. That system is also used in ML where pump seats in higher point of the tank and venturi "leg" sucks the fuel from the very bottom.
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post #7 of 7 (permalink) Old 03-05-2009, 06:00 PM
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There is only 1 actual pump the other on is just a float
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