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2002 Mercedes C320
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14 Posts
Discussion Starter #1
I have to replace my fuel pump but I want to make sure I get the right one, is there a specific fuel pump I need to buy? My fuel pump is located under the back seat on the driver side.
 

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Coupe/Convertible Forums Moderator
CURRENT: 2011 SL550, 2011 C300 FORMER: ML350, CLK550 Cabriolet, C240, ML320, 300TD
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19,338 Posts
Yes, you need the correct fuel pump for your car. You should update you forum user profile so we know what car you have.
 

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W163 Crash Test Driver
2008 ML350 (Me!), 2010 GLK350 (Wife), 2003 ML-350 (Deceased)
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1,571 Posts
Post your full VIN for the exact part number. Parts can vary depending on model, year, options, etc.
 

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W163 Crash Test Driver
2008 ML350 (Me!), 2010 GLK350 (Wife), 2003 ML-350 (Deceased)
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1,571 Posts
Here you go! By the way, your fuel pump (aka the "feed unit") is located under the back seat, true. BUT did you know that it is inside the gas tank. ?

Instructions are attached. You will need a heat gun to remove the sealed top plate. It also helps if you have the ring tool to get the cover off as well as fuel line connector pliers.

I also attached your vehicles Datacard for your records. Good luck!

2620560
 

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Registered
2002 Mercedes C320
Joined
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14 Posts
Discussion Starter #7
Here you go! By the way, your fuel pump (aka the "feed unit") is located under the back seat, true. BUT did you know that it is inside the gas tank. ?

Instructions are attached. You will need a heat gun to remove the sealed top plate. It also helps if you have the ring tool to get the cover off as well as fuel line connector pliers.

I also attached your vehicles Datacard for your records. Good luck!

View attachment 2620560
Thank you ??
 

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Registered
2002 Mercedes Benz C320 Wagon
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73 Posts
Replacing the fuel pump is much easier than you would think. If you don’t have the ring tool, you can use a pry bar and a rubber mallet to gently tap the ring as if you’re unscrewing it. Tap each one of the tabs til it starts moving and then it’ll be easy to remove with your hands, like a pickle jar. When you go to put it back you can hand tighten it then use the pry bar and rubber mallet to tap it the opposite direction to secure it and seal it up.
 

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W163 Crash Test Driver
2008 ML350 (Me!), 2010 GLK350 (Wife), 2003 ML-350 (Deceased)
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1,571 Posts
And no smoking. :D
 

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Coupe/Convertible Forums Moderator
CURRENT: 2011 SL550, 2011 C300 FORMER: ML350, CLK550 Cabriolet, C240, ML320, 300TD
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The main fuel line is the hardest one to remove. It's hard to explain, but the collar on it has to be pulled back and out to release. Even so, it's very likely that you will still break the plastic nipples on the pump. If you are replacing the sender and not the pump, cut the lines and remove the pump so you can take it to the workbench and get a better look. If you are replacing the pump, then don;t worry bout breaking the nipples.
 

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Registered
2002 Mercedes C320
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Discussion Starter #13
The main fuel line is the hardest one to remove. It's hard to explain, but the collar on it has to be pulled back and out to release. Even so, it's very likely that you will still break the plastic nipples on the pump. If you are replacing the sender and not the pump, cut the lines and remove the pump so you can take it to the workbench and get a better look. If you are replacing the pump, then don;t worry bout breaking the nipples.
Any inexpensive tool i could buy that will make it easier?
 

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Coupe/Convertible Forums Moderator
CURRENT: 2011 SL550, 2011 C300 FORMER: ML350, CLK550 Cabriolet, C240, ML320, 300TD
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No, there are no special tools for this. The clip/collar is easily released with a screwdriver, but over the years, the hose gets so stuck on the plastic, and the plastic gets so brittle, that it breaks.
 

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W163 Crash Test Driver
2008 ML350 (Me!), 2010 GLK350 (Wife), 2003 ML-350 (Deceased)
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1,571 Posts
I would give the connector a good soak with PB Blaster first to try and soften up the hose and/or any o-rings. Then work slowly and make no sudden movements. ;)

I just had a similar situation where I could not get the marker light assembly out of my ML350's headlights to save my life. It probably hadn't been changed in many years and the o-ring had cemented itself to the housing. It's in such an incredibly awkward spot, you can only use your fingertips and can't get a good grip for leverage or even pliers. I gave it a good squirt with PB-B and waited 10 minutes. It loosened things up enough to get it out undamaged.
 

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Coupe/Convertible Forums Moderator
CURRENT: 2011 SL550, 2011 C300 FORMER: ML350, CLK550 Cabriolet, C240, ML320, 300TD
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It will be well lubricated and clean - it's been bathed in gasoline for nearly 20 years now. And that's the problem - everything is brittle.
 
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