Mercedes-Benz Forum banner

1 - 20 of 43 Posts

·
Registered
1986 300 SL Euro spec - Signal Red/Black Eng/Trans: Inline 6 (M103.982) / 722.322 Auto
Joined
·
1,976 Posts
Discussion Starter #1
Was ready to take the SL out this morning for a quick ride before the kids got up and when I got to the garage smelled the fumes :( . A quick look under the car and discovered the line from the fuel filter to the main fuel line was leaking ... so much for my drive today, tomorrow, etc. damn !! :mad:

So I got the part overnight expressed to my sister in Miami who's coming down on Sunday, but need some advise in the instalation dept.

1. This line runs from the filter to the main line... I imagine it has pressure... how do I release this pressure in order to change it?

2. Once changed, how do I prevent air (inside the new unused line) from affecting the rest of the system? Do I need to "bleed" it? Don't want to start the car up with it disconnected and become a Darwin nominee :eek:

Any advise is greatly appreciated. Pic of the culprit attached.
 

Attachments

·
Premium Member
2010 Mercury Milan Hybrid, 1993 BMW 325i convertible
Joined
·
6,077 Posts
1. This line runs from the filter to the main line... I imagine it has pressure... how do I release this pressure in order to change it?
Take off the air filter housing and press down on the big plate there.

2. Once changed, how do I prevent air (inside the new unused line) from affecting the rest of the system? Do I need to "bleed" it?
No bleeding required, no stress over air in the lines. It'll crank a few times and then start up. Or blow up. Sometimes I get those confused.
 

·
One of the BW Old Guard/R129, W204 Moderator
1997 SL500- 40th Anniversary
Joined
·
7,166 Posts
Take off the air filter housing and press down on the big plate there.



No bleeding required, no stress over air in the lines. It'll crank a few times and then start up. Or blow up. Sometimes I get those confused.

Is this a 6 cyl or V8? I thought the 6 cylinder was an updraft air meter...
 

·
Registered
1986 300 SL Euro spec - Signal Red/Black Eng/Trans: Inline 6 (M103.982) / 722.322 Auto
Joined
·
1,976 Posts
Discussion Starter #4
Inline 6 - M 103... Updraft air meeter ??
 

·
Registered
1986 300 SL Euro spec - Signal Red/Black Eng/Trans: Inline 6 (M103.982) / 722.322 Auto
Joined
·
1,976 Posts
Discussion Starter #5
Thanks Scotty... I think :eek:.
 

·
Premium Member
1986 560SL with M120 V12 Engine, 1988 560SL Stock
Joined
·
10,170 Posts
Open the fuel cap to depressurize the tank.
Pinch off the large line from the tank to the fuel pump.
Crack the line on the fuel filter and allow the accumulator to bleed into a pan.
Remove line and replace.
Remove pinch off tool.
Install gas cap.
Start engine.

May stall once or twice but not difficult.

While you are there check other lines. The one from the tank to pump will require you to drain the tank. The one in between the two tanks is very expensive. Also how long has the filter been on the car. Maybe a good time to drain the tank, remove the entire pump module and replace all lines and filter.
 

·
Registered
1986 300 SL Euro spec - Signal Red/Black Eng/Trans: Inline 6 (M103.982) / 722.322 Auto
Joined
·
1,976 Posts
Discussion Starter #7
Thanks roncallo, I've got the fuel pump, filter and check valve ordered. Don't ask me why I didn't go ahead and order the lines and tank filter :bash:.

Gonna get those lines this week.
 

·
R/C107 Moderator
1986 560SL: '84 500SL: '84 280SL 5 speed: other 107s
Joined
·
32,320 Posts
You mean pumps, right? As long as your at it might as well get the accumulator too.
 

·
One of the BW Old Guard/R129, W204 Moderator
1997 SL500- 40th Anniversary
Joined
·
7,166 Posts
Inline 6 - M 103... Updraft air meeter ??
does the duct that connects the filter to the mixture control unit, connect to the top of the airflow meter, or the bottom? I am unfamiliar with the 6, and thought it was like the four cylinder, ie the air enters the airflow meter at the bottom, and travels upward thru the meter to the top duct, which feeds the engine (manifold)... If so, one would have to lift the air meter plate, not push it down.
 

·
Registered
1986 300 SL Euro spec - Signal Red/Black Eng/Trans: Inline 6 (M103.982) / 722.322 Auto
Joined
·
1,976 Posts
Discussion Starter #10
does the duct that connects the filter to the mixture control unit, connect to the top of the airflow meter, or the bottom? I am unfamiliar with the 6, and thought it was like the four cylinder, ie the air enters the airflow meter at the bottom, and travels upward thru the meter to the top duct, which feeds the engine (manifold)... If so, one would have to lift the air meter plate, not push it down.
Ears, the filter connects to the top. The plate, if I understand correctly, is pushed downwards to rev up the RPMs when the engine is on. I've done that before. I guess it's what you are talking about.

Can't take pics as I moved the car to my inlaws house which has more open room to ventilate and protect the car until I get the parts.
 

·
Registered
1986 300 SL Euro spec - Signal Red/Black Eng/Trans: Inline 6 (M103.982) / 722.322 Auto
Joined
·
1,976 Posts
Discussion Starter #11
You mean pumps, right? As long as your at it might as well get the accumulator too.
Yes, Ron, I got the fuel pump, filter and accumulator (just checked the email confirming parts ordered). The hoses look in good shape, but now Im a bit skeptical.

The parts will be waiting for me in Miami as I'm headed up there for X-mas vacation, so I won't get to this job till after New Years.
 

·
One of the BW Old Guard/R129, W204 Moderator
1997 SL500- 40th Anniversary
Joined
·
7,166 Posts
That's cool... Like I said, not familiar with the 6cyl, so thought it might updraft since inline engine...

Like I have said in the past, I like the DOHC 2.8 design very much, and wouldn't mind owning a 280 sometime... in the future. I appreciate learning about alternate vehicles/engines. Thanks
 

·
R/C107 Moderator
1986 560SL: '84 500SL: '84 280SL 5 speed: other 107s
Joined
·
32,320 Posts
Yes, Ron, I got the fuel pump, filter and accumulator (just checked the email confirming parts ordered). The hoses look in good shape, but now Im a bit skeptical.

The parts will be waiting for me in Miami as I'm headed up there for X-mas vacation, so I won't get to this job till after New Years.
I am not Ron but that is a compliment. Did you order 2 pumps?
 

·
Registered
1986 300 SL Euro spec - Signal Red/Black Eng/Trans: Inline 6 (M103.982) / 722.322 Auto
Joined
·
1,976 Posts
Discussion Starter #14
Sorry Rowdie, my mistake. No only ordered one, why 2?
 

·
R/C107 Moderator
1986 560SL: '84 500SL: '84 280SL 5 speed: other 107s
Joined
·
32,320 Posts
Maybe the 300 is different, the 560 has 2. EPC shows 2 like the 560.
 

·
Registered
1986 300 SL Euro spec - Signal Red/Black Eng/Trans: Inline 6 (M103.982) / 722.322 Auto
Joined
·
1,976 Posts
Discussion Starter #16
my vin: wdb1070411a037274 - can you doble check pls ? maybe i didn't catch the second one.
 

·
R/C107 Moderator
1986 560SL: '84 500SL: '84 280SL 5 speed: other 107s
Joined
·
32,320 Posts
EPC shows two but easy to confirm. They are side by side and pretty easy to see.
 

·
Registered
1986 300 SL Euro spec - Signal Red/Black Eng/Trans: Inline 6 (M103.982) / 722.322 Auto
Joined
·
1,976 Posts
Discussion Starter #18
Then, its only 1 cause the only other part there that looks like a pump is the filter. I'll get under the car next week to change the faulty line and snap more pics to post. Hell, if I can I'll film the job and post that !! :D
 

·
R/C107 Moderator
1986 560SL: '84 500SL: '84 280SL 5 speed: other 107s
Joined
·
32,320 Posts
Yours is an unusual model so it is great to learn as we go along. The EPC shows the same diagram as the 560 but a different part number. Blazing new trails here.:thumbsup:
 

·
Registered
1986 300 SL Euro spec - Signal Red/Black Eng/Trans: Inline 6 (M103.982) / 722.322 Auto
Joined
·
1,976 Posts
Discussion Starter #20
Yeah, strange car I went and got. Too bad I can't drive it up to your GTG next year to show it off. :( ... oh, yeah, you won't be there :D
 
1 - 20 of 43 Posts
Top