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  #1  
Old 05-26-2006, 02:51 AM
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126 Gas Tank Fuel Line

While looking to replace the Fuel Filter I noticed that the main Fuel Tank supply hose# 1264701675 is showing its age and the rubber has cracks in it. I figure I need to empty the Tank in order to replace it. In a way this would be the logical time to replace the Fuel Screen (is 2014700506 the correct # ?) and clean the tank. Can the tank even be cleaned without removing it from the car ? How? What do you think. Am I being overzealous here and asking for a major headache?TIA

300SE - 1987 Euro

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Old 05-26-2006, 04:29 AM
wbain5280's Avatar
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I just went through this exercise. I replaced all fuel lines, except the return line, and the mounting hardware. I wanted to replace the tank screen but the tank must be removed, which I didn't want to do. There is a rubber gasket between the tank and the body where the fuel lines go. (I didn't replace the return line because I didn;t have the right tool and I needed to get the car going.)

See group 47

http://mb.braingears.com/126_DISC1/program/engine_300SE.htm


Tank removal

http://mb.braingears.com/126_DISC1/program/Engine/103/47-100.pdf

I emptied the tank by using the fuel pump powered by a battery charger and a long hose to pump out the tank into plastic gas cans.


Caution: Fuel vapors are explosive. Use rubber gloves.

Do not plug in the battery charger until the charging clamps have been attached to the fuel pump. Observe the polarity, which is marked on the pump, and then plug in the charger. Empty the tank into gasoline containers. Have a garden hose ready just in case.

Then you can remove the tank etc.

See also:

http://mb.braingears.com/126_DISC1/program/engine_300SE.htm

Function group 07.3, sub FG 270 - 280.

I bought new everything except the pump and accumulator.

I will get to the return line and screen eventually and a new accumulator.
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Warren

Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor

Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL

ENTER > = (HP RPN)

Not part of the in-crowd since 1952.
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Old 05-26-2006, 09:34 AM
Mike Murrell's Avatar
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Went thru this recently as well. On my 126, the tank screen does come out. The tank was left in the vehicle. Screen is accessed from below. Best to back car up on ramps. You either need a 1 & 13/16" socket or a 46mm socket to get the fuel filter screen out. Some here claim they got it loose with large pliers. If so, the screen was either loose or they are incredibly strong. I have the Baum 46mm socket made especially for this task and even with it, some elbow grease was needed to break the fuel tank filter screen loose. I pretty much replaced the entire fuel delivery/filtering system at the rear of the car.

Here's a brief write-up I put together when I got done:

Stall in Warm Weather - Fixed
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1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"
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Old 05-27-2006, 12:38 AM
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HI Mike

I didn't even see the large nut for the screen that's why I think the tank must be removed. The rubber gasket that seals the hole under the tank was really large and thick.

I've got a new screen and the return hose, so when the tank get really empty, I'll give it another try.
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Warren

Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor

Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL

ENTER > = (HP RPN)

Not part of the in-crowd since 1952.
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  #5  
Old 05-27-2006, 02:49 PM
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Thanks for the replies and information - I too would rather not remove the tank. Heck, I am not going to remove it ! I will replace the main supply hose and return line, which I believe is all I need right now. About the fuel screen - I do have a 46mm socket from the days of replacing the fuel level sending unit , but before I go there I am curious Mike as to whether you were able to clean the tank, especially with it being on an angle ( car on ramps). Was the screen really clogged/in poor shape ? While under the car I did not see the filter screen "lip" , so I'm guessing it is hiding underneath the large rubber gasket, which has to come off. Am I right in assuming that ?

Last edited by gidpor; 05-28-2006 at 11:22 AM.
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Old 05-30-2006, 10:13 AM
Mike Murrell's Avatar
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Quote:
Originally Posted by wbain5280
I've got a new screen and the return hose, so when the tank get really empty, I'll give it another try.
Warren - just a heads-ups when you pull the tank screen.

I drove my 300-SEL 'til the low fuel warning light came on, then drove another 20 mi. In spite of this, approx. 2.5 gals. of fuel was left in the tank.

I pulled the big hose that goes from the base of the tank to the fuel pump off at the fuel pump end first, then let the tank drain into a large pan.
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1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"
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  #7  
Old 07-14-2006, 10:52 AM
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Got under the car (finally) the other day. Job went well without any problems - I even drove it around for a day before writing my final posting here..
As a first step I had removed the- fuel pump/filter/accumulator - as one piece with the bracket, which made access to the bottom of the tank very easy. Even though the CD calls for a special tool , I found no need for one !
And Mike, I had the copper washer " and company" installed the correct way. Thanks for your confirmation.
As a footnote I will just add that the original fuel tank screen was not really dirty at all and therefore did not need replacing. No way to know that in advance..is there? - Since I had already bought the replacement - in it went..
thanks all for the advice.

Gideon

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