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  #1  
Old 08-22-2003, 11:17 AM
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Fuel pumps

Last week I replaced my 91 300E fuel filter and accumulator. After searching this forum I bought a Bosch filter and installed it. Everything was fine until yesterday. I noticed a buzzing sound coming by the fuel filter and pumps area. I never heard this buzzing noise before. Should I have done something differently (e.g. the way hoses are placed by the the filter) when replacing the filter and accumulator?

Or maybe I should have bought a Knecht (fast lane part# E1000-12143) filter since that was on my car when I replaced it with Bosch (fast lane part # E1000-29298).

It is also possible that this is just a coincidence and the fuel pumps are dying out. If this is the case any hints on replacing the fuel pumps. The part number I found in fast lane s Bosch part # E3000-95322. Is this the correct pump I should buy.

Thanks
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Old 08-22-2003, 12:44 PM
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Presuming it operates well, this is likely a vibration problem at the pump/filter/accumulator mounting bracket. Make sure everything is tight, and the rubber isolators the assembly hangs on are in good shape. If the mounting bracket is bent, or the new components are not the exact same diameter as the old ones such that bracket no longer clamps tight on them, you can wedge in bits of rubber hose (or similar) to take up the slack. I had this exact problem with my single pump setup.
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1986 300E 5-Speed 240k mi.
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Old 09-03-2003, 04:23 PM
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removal procedure

Could you please describe for a novice DIYer how to replace the fuel pump, fuel filter & fuel accumulator ( I have an 87 300e which I believe has only one pump). I especially need to know how to disconnect the fuel line. I may be able to sway the complete assembly, which I imagine is much easier. Thanks.
Rich
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Old 09-03-2003, 04:55 PM
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Looks like this:

Pump is on left, filter in middle, accumulator on right.
As you can see, there are several fuel lines involved.
If you can avoid it, the accumulator is pretty expensive.
The worst part of the job is all of the fuel that spills on your head, even if tank is drained.
I also had a lot of trouble removing the banjo bolt on the backside (which you cannot see in image).
Get a Bosch pump. Do not be tempted by the Tawain special at Autozone as I was, since it is very noisy. Works ok otherwise, but not a good way to save $40...
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Fuel pumps-fuelsm2.jpg  
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1986 300E 5-Speed 240k mi.

Last edited by csnow; 09-03-2003 at 05:06 PM.
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Old 09-03-2003, 05:08 PM
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Thanks. How do I drain the tank?
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Old 09-03-2003, 05:39 PM
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This can be a tricky, and potentially dangerous thing to do. I have done this the 'wrong' way many times, but never again, and I will not elaborate...

One obvious method includes disconnecting the hose, and letting fuel run into a container, but this would be particularly difficult on the 124, since the flexible line is so short. Also, you would need to have a big enough container, since shutting off the stream is tough.

There are many devices that can help get a siphon started, including the 'Wonder Pump', which seems to be sold in many places:



I saw this at the Marine store for just $17, which looks ideal for this purpose:
Gas-VacŪ Siphoning System at http://www.overtons.com


When I did mine, I used a suction pump like the one below, but as I mentioned in another thread, it has since broken apart after a minor 2-foot drop. It was good otherwise for a variety of purposes. I think it was about $40, but it seems to be $50 or more everywhere I look now. BTW, they do not recommend using it for gasoline, (so I will not either)...



I played with the idea of installing a shutoff valve so that it would be easier to service the filter the next time, but I did not have enough time to put it together.
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Old 09-03-2003, 05:48 PM
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I recently used an electric ( it operates off the car battery) marine oil changer pump I bought online from Seaboard for about $30 to siphon some gas out of a disabled car, but I didn't take all the gas because I didn't want the crud at the bottom. However, for draining purposes I think it would work just like the vacuum pumps you described. Thanks again.
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Old 09-03-2003, 06:24 PM
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csnow brings up a good point - check connections for snugness, etc.

Something else to think about is the filter that was used.

Part 002 477 13 01 was designed for single pump systems.

Part 002 477 44 01 was designed for dual pump systems.

See the following URL:

http://catalog.eautopartscatalog.com/smittys/ap/wizard.jsp?partner=smittys&clientid=aplusparts.com&baseurl=http://www.aplusparts.com/&cookieid=0UV171X5G&year=1991&make=MB&model=300-E-002&category=E&part=Fuel+Filter
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Old 09-03-2003, 06:25 PM
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I would just mention that those electric pumps may not be safe for gasoline, since depending upon the design, the vapors may pass through the spark at the motor's brushes.

There was recently an explosion in NH when boaters attempted to use a shop vac to suck up fuel:

http://www.thewmurchannel.com/news/2392448/detail.html
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Old 09-03-2003, 06:27 PM
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Thanks . I'm calling Seaboard first thing tomorrow.
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