Car acts like spin on filter is clogged. Just swapped it. 1982 300TD - Page 2 - PeachParts Mercedes-Benz Forum

toomany MBZ · #16 01-19-2014, 04:12 PM

Look up the part #s for both here, are they the same?

If so, same threads.

curt5446 · #17 01-19-2014, 04:32 PM

Completely different part numbers. The fuel leaves the tank differently on the TD

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toomany MBZ · #18 01-19-2014, 08:17 PM

I see, entirely possible the length is different. Either way, you can't swap 'em.

curt5446 · #19 01-19-2014, 08:45 PM

I just ordered a 300D strainer with the special hose so we'll find out soon. ;-)

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tangofox007 · #20 01-19-2014, 08:54 PM

Quote:

Originally Posted by curt5446

If you have a clogged screen, you are creating the same situation, albeit on a smaller scale. Perhaps this illustration will explain it a little better. If you clog the screen, you collapse the reservoir at the bottom of the tank.

Okay, that makes sense. Maybe an alternative solution would be to install a vent tube in the top of the screen, so that it extended to a height just short of the upper side of the tank.

whunter · #21 01-19-2014, 09:14 PM

Quote:

Originally Posted by curt5446

Tried the underhood tank and the car ran wonderfully.

So the issue was at the rear of the car.

Going off of the assumption that the issue was with a collapsed/leaking fuel line, I threw a new 3/8" hard fuel line for the supply.

The car ran the same. Drained the tank through the tank screen and discovered that the screen was clogged again.
Likely from sediment that the PO had built up with veggie oil.

Cleaned the screen really well and threw it back in with a few gallons of fresh dino (diesel fuel) and it ran the same.

Drained tank again and found that the reservoir that the TD has in the tank had collapsed whilst the tank screen was clogged due to vacuum build up when the screen was clogged.

My thought on this is to install a standard 300D tank screen however, I'm not sure if the threads are the same.
Can anyone verify that?

What is this valve and why is it dripping diesel?
What is this valve and why is it dripping diesel?

Fuel tank vent pictures + location
93 300D 2.5L Turbodiesel Power Loss

What happens when a tank vent gets clogged.
What happens when a tank vent gets clogged. - PeachParts Mercedes ShopForum

Imploded fuel tank - so sad!
Imploded fuel tank - so sad!

Why do I have vacuum in my diesel tank.....................?
Why do I have vacuum in my diesel tank.....................? - PeachParts Mercedes ShopForum

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Diesel911 · #22 01-20-2014, 03:37 AM

Quote:

Originally Posted by sloride

There are plenty of post illustrating how to isolate the the fuel tank with a temporary 2 liter bottle just to remove the possibility of a tank and fuel line problem.

X2.
If you do the above and you still have the problems in the Original Post you could be looking at a Fuel Supply/Lift Pump Issue or an Fuel Pressure Relief/Overflow Valve issue.

whunter · #23 01-20-2014, 05:02 AM

Quote:

Originally Posted by curt5446

Drained tank again and found that the reservoir that the TD has in the tank had collapsed whilst the tank screen was clogged due to vacuum build up when the screen was clogged.

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whunter · #24 01-20-2014, 05:19 AM

FYI for W123 sedan owners.

The W123.193 300TD turbo - fuel tank system is very different because it requires a separate vapor EXPANSION tank.

The W123.193 300TD fuel tank mounting position allows total liquid fill, leaving no vapor expansion space, this is not a problem with a separate vapor EXPANSION tank.

I have seen these cars run with the expansion tank eliminated, and a pin hole in the fuel cap to vent = with a full tank on a hot day you can watch fuel spray from the cap.

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curt5446 · #25 01-20-2014, 06:35 AM

Does anyone know if the tank screens between the 300D and the 300TD have the same thread diameter and pitch?

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curt5446 · #26 01-20-2014, 06:36 AM

The problem is already figured out, just need to know about the tank screen threads

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whunter · #27 01-20-2014, 06:58 AM

Quote:

Originally Posted by curt5446

The problem is already figured out, just need to know about the tank screen threads

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whunter · #28 01-20-2014, 07:10 AM

Quote:

Originally Posted by curt5446

Does anyone know if the tank screens between the 300D and the 300TD have the same thread diameter and pitch?

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It has been a while since I had both in hand, but as I recall they are different diameter = not compatible.

I will advise against what you are considering.
Tapping fuel feed off the tank strainer is a BAD idea.

The area is subject to road debris and ground impact = breaking off the hose or fitting.

I have seen this attempted before, and it does not survive..

Cleaning the fuel tank is the better answer.

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curt5446 · #29 01-20-2014, 07:30 AM

It's a temporary fix at this point to get me through the winter. It's going to be a high of eight degrees here tomorrow and I don't plan on spending the time outside to drop the tank. As far as cleaning the tank, I cant. The reservoir at the bottom of the tank is collapsed so cleaning the tank won't amount to much. I will need to replace the tank when the weather is a little more favorable to working under a car.

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whunter · #30 01-20-2014, 08:47 AM

Quote:

Originally Posted by curt5446

It's a temporary fix at this point to get me through the winter. It's going to be a high of eight degrees here tomorrow and I don't plan on spending the time outside to drop the tank. As far as cleaning the tank, I cant. The reservoir at the bottom of the tank is collapsed so cleaning the tank won't amount to much. I will need to replace the tank when the weather is a little more favorable to working under a car.

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Remove the strainer, cut the strainer off the plug.

Blow 10 - 25 PSI air through the feed line to the tank.

Force some rod (permanently) into the reservoir at the bottom toward feed line to the tank (to force it open to flow).

Install the plug.

Install a large auxiliary diesel filter under the hood before the lift pump.
https://www.google.com/search?q=auxiliary+diesel+filter&client=firefox-a&hs=DPb&rls=org.mozilla:en-US

fficial&source=lnms&tbm=isch&sa=X&ei=fyfdUqjNAtHNsQSAyYHIDg&ved=0CAoQ_AUoAg&biw=1280&bih=859

I have used a remote mount engine oil filter to keep infested systems on the road, often for a year or more.
https://www.google.com/search?q=remote+mount+oil+filter&client=firefox-a&hs=9kG&rls=org.mozilla:en-US

fficial&source=lnms&tbm=isch&sa=X&ei=zCfdUprZFYnOsAS1rYCIDQ&ved=0CAoQ_AUoAg&biw=1280&bih=859

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