fuel tank strainer removal on diesel cars - Mercedes-Benz Forum
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#1 (permalink) Old 07-27-2009, 12:05 PM
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fuel tank strainer removal on diesel cars

I recently removed and replaced the fuel strainer on my '85 300D and it was completely clogged with slime and sediment. After draining the tank, I proceeded to remove the strainer. To do this you will need a large socket - 1 and 13/16 inch to be exact (do not know the metric equivalent, but this size works well). The problem is that they do not offer such large sockets in 1/2 drive versions, so you have to get a 3/4 inch drive socket. I bought one from Sears for $ 26, only to discover that when I used a 3/4 to 1/2 adapter with my 1/2 inch breaker bar, there was not enough clearance because the axle joint can was in the way.

So I went to my local Harbor Freight store, got a 3/4 inch socket set complete with ratchet and breaker bar for $ 45 on sale. Using a 1 13/16 socket and 3/4 inch breaker bar, I got the strainer loose. Then I removed it, but suddenly another 4 gallons of diesel gushed out with surprising force. So have a large tub ready, which I fortunately had.

The old O ring on the strainer was completely flatened and I replaced the whole thing, although the old strainer can be cleaned with an old toothsrush in a can of diesel.

The drained diesel fuel can be successfully filtered using a paint paper filter inside a funnel and poured back into the tank. Just filter in from the tub into a plastic 5 gallon gas can and reuse.

You may want to consider replacing the short fuel tank outlet and intlet hoses with special fittings too. It is more than likely that they are the original hoses, more than 20 years old at this point.

Last edited by p100; 07-27-2009 at 12:08 PM.
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#2 (permalink) Old 07-27-2009, 12:53 PM
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If you want to make your job a little easier and less messy take a four foot length of hose and attach it to the return line and put it into a 5 gallon can and let the Mercedes empty the tank for you.
You can let the car run and fill the can up for you. I did this on my 300CD it worked out great.

1984 300 CD
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#3 (permalink) Old 07-29-2009, 12:06 AM
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Quote:
Originally Posted by PhantomCadillac View Post
If you want to make your job a little easier and less messy take a four foot length of hose and attach it to the return line and put it into a 5 gallon can and let the Mercedes empty the tank for you.
You can let the car run and fill the can up for you. I did this on my 300CD it worked out great.
I wish I saw this two days ago, I just checked my tank since its so old and completely flooded the road with diesel. The good part is I saved atleast 10 gallons before removing the lines, bad is I lost about 5 . The best part is I had to spend more than 6 hours pressure washing with detergent all of the diesel spills, because the fumes were literally gassing out the nearby homes.
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#4 (permalink) Old 07-29-2009, 08:53 AM
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Quote:
Originally Posted by PhantomCadillac View Post
If you want to make your job a little easier and less messy take a four foot length of hose and attach it to the return line and put it into a 5 gallon can and let the Mercedes empty the tank for you.
You can let the car run and fill the can up for you. I did this on my 300CD it worked out great.
How long of idling does it take for a gallon of returned fuel?
5 minutes?
10?


1984 Mercedes €uro 300D NA - 178K miles
Thistle Green Metallic - Custom VO two tank
1997 Ford F-350 7.3L Powerstroke turbo diesel - Plant Drive VO Kit
Running on Veg Oil and Biodiesel since May 2006
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#5 (permalink) Old 07-29-2009, 11:03 AM
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I would just siphon the fuel out of the gas tank through the filler neck. The problem I see with running the car and emptying the tank through the return hose is that you are risking running our of fuel. Restarting the car then may be quite difficult, even after repeatedly priming the system. I have already expereinced it once.
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#6 (permalink) Old 07-29-2009, 11:10 AM
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tool to make it easier

I have this tool in my tool box for the job.

116 123 126 Chassis Fuel Tank Outlet Screen Removal Socket | MercedesSource.com
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#7 (permalink) Old 04-26-2013, 11:58 AM
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Anyone want to rent this tool?

Anyone have one of these MercedesSource tools they'd be willing to rent?

Tim

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#8 (permalink) Old 04-27-2013, 08:03 AM
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You can also get VW axle/gland nut wrenches for about $10 that have a 1/2 inch drive. Any buggy shop will have them as well as eBay.

EDIT: I just double checked and this is not the right socket for this application. Sorry for the inaccurate post.

Last edited by mach4; 04-27-2013 at 02:21 PM. Reason: Wrong info
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#9 (permalink) Old 04-27-2013, 10:51 AM
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You can use a 1-13/16" socket or a 46mm Socket.
I picked up a 1-13/16 Socket at a cheapie Tool place for about $6. It is a 3/4" drive but I already had the adapter for 3/4-1/2" drive.

One of the problems is that the Fuel Tank Screen Nut is thin and some Sockets have a tapered radius on it that is deep enough that it would barely grab the Nut. Simly meaning that the business end of the Socket needs to be flat.
In the pic I show the tapered part (I call the radius). When I want to use this socket on a Tank Screen I am going to have to grind that tapered Radius off so it is flat.

You can also simply buy a Socket that does not have much radius on it.
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#10 (permalink) Old 03-31-2014, 03:35 AM
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Return Line Won't Work.

Quote:
Originally Posted by PhantomCadillac View Post
If you want to make your job a little easier and less messy take a four foot length of hose and attach it to the return line and put it into a 5 gallon can and let the Mercedes empty the tank for you.
You can let the car run and fill the can up for you. I did this on my 300CD it worked out great.

Using the return line and pumping it through a hose into a can won't work if the fuel strainer is too clogged. I tried it (as I have done in the past), and almost nothing came out; this is because there was insufficient fuel getting to the engine. Just enough to keep it running.

Emptying the tank through the strainer is a good job to do when your fuel gauge is less than quarter full. That's for sure.
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