1988 260e fuel pump and filter location? - Mercedes-Benz Forum

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Old 07-23-2010, 03:53 PM   #1 (permalink)
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1988 260e fuel pump and filter location?

hello just bought a 260e and am new to mercedes. the filter and pump are located under the panels under the car right? any good info or pics out there to help me locate them and take off the panels. i don't know what panels to take off or how to to take off the panels. any links to steps or pics would help. thanks.
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Old 07-23-2010, 06:06 PM   #2 (permalink)
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Under the rear passenger, passenger side under a bolted down cover. Right below the gas tank that is in the trunk.
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Old 07-23-2010, 06:56 PM   #3 (permalink)
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thats exactly right
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Old 07-23-2010, 07:42 PM   #4 (permalink)
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The cover protecting the fuel pumps and filter is made of heavy plastic. It is held in place by 4 plastic 10mm nuts. Jack up and secure the right rear of the car. It is the only thing you'll see under the right rear passenger seat. When you change the filter, do so in a very well ventilated area as their will be gas that leaks/runs when you disconnect the filter. It is a simple affair and you shouldn't have any problem completing this, just be quick.

Good Luck,

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Old 07-23-2010, 10:31 PM   #5 (permalink)
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thanks. found the filter and what looks like 2 fuel pumps? the car wasn't starting before. i hot wired both pumps to the battery and the car started. are both these pumps supposed to be on all the time when the car is running? thanks again.
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Old 07-23-2010, 11:36 PM   #6 (permalink)
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it's kinda funny. i don't even have any $$$ for a new relay or whatever is causing the fuel pumps to not get power....i was thinking as a temp fix i could "somehow" wire the key in while door is open buzzer from the ignition as the on and off for the fuel pumps. just wondering if both the fuel pumps are supposed to be on all the time when the car i running. thanks
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Old 07-24-2010, 03:23 AM   #7 (permalink)
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Bones,

The fuel pumps should run while the car is running. When first energized, the pumps will "prime" the system then shut down. When the engine starts, they will then run constantly. Your car has a fuel pump relay that I believe is located behind the plastic shield, behind your battery. If not, others on the forum will correct me and provide the correct location.

There is a two prong connection for the pumps located under the passenger rear seat bottom. You might use that for your connection point until funds are available for the relay. Relay's are a tic over $100 or you could possibly find one in working order at a pull-it yard. The relay looks like this....

Good Luck,

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Old 07-24-2010, 04:26 AM   #8 (permalink)
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The pumps work as a pair, both running at the same time, to ensure adequate fuel flow at all times. Much of the fuel sent to the engine isn't used and goes back to the fuel tank.
How many people here know that the fuel return line includes a heat exchanger located under the intake manifold? The fuel returnng to the tank is cooled by the air conditioner suction line whenever the a/c is operating.
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Old 07-26-2010, 03:14 AM   #9 (permalink)
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hey thanks. i ended up hot wiring the pumps to fuse #7 before the actual fuse. this fuse turns on in key position 2 and when the car is running.
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