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  #1  
Old 03-26-2023, 08:42 PM
JHZR2's Avatar
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Location: New Jersey
Posts: 5,057
W126 fuel filter change mess

I did my fuel filters today on my 350SD. Far from the first time. Fuel was on the light, so very low.

As soon as I released the main bolt, it started seeping out. But it never stopped. And to make it worse, somehow it was next to impossible to coax the filter out.

I donít know how much came out, a gallon? A pint?



And since the install was equally hard, I had to tilt the filter on its side, spilling a lot of diesel purge that I used to prefill the filter.

Whatís the issue? This car is new to me. I donít recall having this issue on any other 616/617/602/603 that I own. The most recent were a 602 and the 603 in my w140. Neither made any mess at all.

I do think proper practice is to have a loop in the rubber hose going to/from the prefilter. This w126 doesnít have that.

What gives?

Maybe I have too much pressure in my fuel tank??

__________________
Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (113k)
1991 350SD (206k)
1991 300D (228k)
1993 300SD (291k)
1993 300D 2.5T (338k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (265k)

Past Diesels:
1983 300D (228K)
1985 300D (233K)
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  #2  
Old 03-27-2023, 05:35 AM
vstech's Avatar
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Location: Mount Holly, NC
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Pressure in the tank would do it, as would having the rear of the vehicle higher than the front.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #3  
Old 03-27-2023, 09:50 AM
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Quote:
Originally Posted by vstech View Post
Pressure in the tank would do it, as would having the rear of the vehicle higher than the front.
Vehicle was totally flat. This car does build pressure in the tank. Iíve never seen it in any of my other cars. Maybe that was itÖ
__________________
Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (113k)
1991 350SD (206k)
1991 300D (228k)
1993 300SD (291k)
1993 300D 2.5T (338k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (265k)

Past Diesels:
1983 300D (228K)
1985 300D (233K)
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  #4  
Old 03-27-2023, 11:00 AM
vstech's Avatar
DD MOD, HVAC,MCP,Mac,GMAC
 
Join Date: Mar 2006
Location: Mount Holly, NC
Posts: 26,631
If it builds pressure, you have rust in the relief hose, or the pressure/vaccum pod is damaged.
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #5  
Old 03-27-2023, 12:26 PM
JHZR2's Avatar
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Join Date: Jan 2002
Location: New Jersey
Posts: 5,057
Quote:
Originally Posted by vstech View Post
If it builds pressure, you have rust in the relief hose, or the pressure/vaccum pod is damaged.
Whatís the best way to check these? Iím not sure Iím familiar with a pressure/vacuum pod. I know thereís a tank vent under the car someplace.
__________________
Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (113k)
1991 350SD (206k)
1991 300D (228k)
1993 300SD (291k)
1993 300D 2.5T (338k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (265k)

Past Diesels:
1983 300D (228K)
1985 300D (233K)
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  #6  
Old 03-30-2023, 01:22 PM
vstech's Avatar
DD MOD, HVAC,MCP,Mac,GMAC
 
Join Date: Mar 2006
Location: Mount Holly, NC
Posts: 26,631
Iirc, it is a bell shaped device under the passengers wheelwell.
Pull your fuel cap off, disconnect the bell and blow air through the line.
See if its clogged. The tank can actually implode if the bell fails...

__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
Reply With Quote
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