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  #1  
Old 04-30-2011, 11:43 PM
Austin85's Avatar
Smells like Diesel..
 
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Where is the The Fuel Pressure/Over Flow Valve that controls fuel supply pressure to

1981 300SD

Can someone help me locate the
"The Fuel Pressure/Over Flow Valve that controls fuel supply pressure to the Fuel Injection Pump Housing " on my '81 300SD.

Describe where or if anyone had a pic with one of those arrows .....

Want to remove this and clean it...

Thanks
AA


.....

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'87 924S
'81 280SEL

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81 300SD -
93 300E w/ 3.2
85 300D-
79 300SD
82 300CD
83 300CD - CA
87 190E 5 spd
87 Porsche 924S

"..I'll take a simple "C" to "G" and feel brand new about it..."

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  #2  
Old 04-30-2011, 11:56 PM
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It's on the IP facing the block by the temp sensor on a return banjo fitting. 17 mm. Spring is weakened over the years. Stretching it to increase pressure works temporarily.
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  #3  
Old 05-01-2011, 12:00 AM
toomany MBZ's Avatar
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If that's what I think it is, follow the hard plastic line located on top of the fuel filter head, the return three way item.

One line is from the injector return line, one to the cigar hose and that plastic line from the banjo bolt.

On the other end, at the IP is another banjo bolt, inside that is a spring and a ball bearing.
Doing diesel purge - "ran out of fuel"

The FSM pdf is in the above link, post 5.
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  #4  
Old 05-01-2011, 12:40 AM
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On top of your Fuel Filter is a Banjo that has 3 hoses connected to it. One hose is the Injector Fuel Return line, the other is a straight Hose that goes down to the Rear of the Fuel Injection Pump Housing (on the side of the Fuel Injection Pump closest to the Engine), the other hose is the Cigar Hose that takes the return Fuel Back to the tank.

Simply trace the straight hose down to the back of the Fuel Injection Pump and loosen what appears to be the Banjo Bolt (but it is the Pressure Relief/Over Flow Valve) and remove it if you want to. There will be 2 Aluminum or Copper Crush washers that seal the area.

In the pic the Red Arrow points to where the Pressure Relief/Over Flow Valve would go.
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Where is the  The Fuel Pressure/Over Flow Valve that controls fuel supply pressure to-pump-b.jpg  
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  #5  
Old 05-01-2011, 11:25 AM
Austin85's Avatar
Smells like Diesel..
 
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See pics....Is this what I'm supposed to clean?

It looks clean as a whistle....
AA


...
Attached Thumbnails
Where is the  The Fuel Pressure/Over Flow Valve that controls fuel supply pressure to-inj-bolt-001.jpg   Where is the  The Fuel Pressure/Over Flow Valve that controls fuel supply pressure to-inj-bolt-002.jpg   Where is the  The Fuel Pressure/Over Flow Valve that controls fuel supply pressure to-inj-bolt-003.jpg  
__________________
'87 924S
'81 280SEL

Sold ->

81 300SD -
93 300E w/ 3.2
85 300D-
79 300SD
82 300CD
83 300CD - CA
87 190E 5 spd
87 Porsche 924S

"..I'll take a simple "C" to "G" and feel brand new about it..."

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  #6  
Old 05-01-2011, 12:31 PM
Austin85's Avatar
Smells like Diesel..
 
Join Date: Jun 2005
Location: Boca Raton, Fl
Posts: 2,723
Thanks ...

I do not know if that was the bolt to clean but I did spray it out with brake parts cleaner and reinstall....SD started up - stalled .........then on 2nd try started up .........and with "Italian tune up"...seems to be back to normal and ready for more....

Thanks,
AA

__________________
'87 924S
'81 280SEL

Sold ->

81 300SD -
93 300E w/ 3.2
85 300D-
79 300SD
82 300CD
83 300CD - CA
87 190E 5 spd
87 Porsche 924S

"..I'll take a simple "C" to "G" and feel brand new about it..."

Reply With Quote
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