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  #1  
Old 11-17-2005, 03:22 PM
Austin85's Avatar
Smells like Diesel..
 
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Question Extra air in my primary fuel filter?????

I have been running 2K miles on WVO blend, and finally have clean primary filter for last 300 miles.....
But last nite I started loosing power and at idle Tach was down to 500rpm, and stalled once....
Checked the primary and pumped manually, and it looked as if the fuel was draining back into the line...and the filter wouldn't stay full.
I am guessing this is why I was loosing power, I checked the hoses and they look strong; tightened the clamps up..but still get a little extra air pocket in the primary....
Anyone have a clue what is causing this ???? What to check for???

**One thing I did notice was the 2 lines that come out of the tank on the passenger side have a rubber stopper gasket they come out through; This felt worn and soft.....
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  #2  
Old 11-17-2005, 03:36 PM
boneheaddoctor's Avatar
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Location: Hells half acre (Great Falls, Virginia)
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Quote:
Originally Posted by Austin85
I have been running 2K miles on WVO blend, and finally have clean primary filter for last 300 miles.....
But last nite I started loosing power and at idle Tach was down to 500rpm, and stalled once....
Checked the primary and pumped manually, and it looked as if the fuel was draining back into the line...and the filter wouldn't stay full.
I am guessing this is why I was loosing power, I checked the hoses and they look strong; tightened the clamps up..but still get a little extra air pocket in the primary....
Anyone have a clue what is causing this ???? What to check for???

**One thing I did notice was the 2 lines that come out of the tank on the passenger side have a rubber stopper gasket they come out through; This felt worn and soft.....
THere is usually an air pocket in that filter..however its rare for that to drain out or empty out, particularly while running. Those rubber lines sound bad...they should feel firm...but not hard and simular to other lines that size on the car.

I would replace suspect rubber lines...they are fairly cheap.
__________________
Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
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Section 609 MVAC Certified
---------------------
"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche
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  #3  
Old 11-17-2005, 03:51 PM
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Join Date: Aug 2005
Location: Michigan
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Quote:
Originally Posted by boneheaddoctor
THere is usually an air pocket in that filter..however its rare for that to drain out or empty out, particularly while running. Those rubber lines sound bad...they should feel firm...but not hard and simular to other lines that size on the car.

I would replace suspect rubber lines...they are fairly cheap.
What do you use for vacuum lines? The vacuum lines I replaced swelled when I got gas on them because they are the cheap EPDM. If I want a line that won't swell I have to get a fuel line but the fuel line is too big and creates a small leak. So I put the old lines back on for now, it's hard to beat MB OEM.
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  #4  
Old 11-17-2005, 03:59 PM
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Quote:
Originally Posted by New2MB
What do you use for vacuum lines? The vacuum lines I replaced swelled when I got gas on them because they are the cheap EPDM. If I want a line that won't swell I have to get a fuel line but the fuel line is too big and creates a small leak. So I put the old lines back on for now, it's hard to beat MB OEM.

Fuel lines should be real fuel line material or preferibly Viton for Biodiesel compatibility, not just something that fits..

Vacuum lines I use what fastlane carries...so far it has served me well, not sure the manufacturer or material to be honest. I have none left but a 4" piece to look at. THe Injector return lines I use MB OEM stuff ...its good quality and is Biodiesel resistant. I usually run B20
__________________
Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
---------------------
Section 609 MVAC Certified
---------------------
"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche
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  #5  
Old 11-17-2005, 04:07 PM
Austin85's Avatar
Smells like Diesel..
 
Join Date: Jun 2005
Location: Boca Raton, Fl
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Quote:
Originally Posted by boneheaddoctor
THere is usually an air pocket in that filter..however its rare for that to drain out or empty out, particularly while running. Those rubber lines sound bad...they should feel firm...but not hard and simular to other lines that size on the car.

I would replace suspect rubber lines...they are fairly cheap.
I'm not saying it drains out while runnnig. It does drain out when off and I am priming the pump to fill the primary.....I am asuming the loss of power is a result of something here. Possibly air getting in my lines somewhere. The lines feel good, but I will replace soon with 3/8 fuel line from AP store...
What about that rubber gasket at the tank????
__________________
'87 924S
'81 280SEL

Sold ->

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

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

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  #6  
Old 11-17-2005, 04:09 PM
boneheaddoctor's Avatar
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Quote:
Originally Posted by Austin85
I'm not saying it drains out while runnnig. It does drain out when off and I am priming the pump to fill the primary.....I am asuming the loss of power is a result of something here. Possibly air getting in my lines somewhere. The lines feel good, but I will replace soon with 3/8 fuel line from AP store...
What about that rubber gasket at the tank????
Around the filler neck? I would expect teh see a small increace in bubble size when off...but draining back is telling me you have a air leak which is bad....you need to find that for sure. THat will be between the filter and the engine most likely.

THe "Stopper" gasket I am not sure what you mean....It might be to keep the elements out as tank is inside the car....that is one I would not worry about. I am assuming you mean where the return line and tank breather go inside to the tank.
__________________
Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
---------------------
Section 609 MVAC Certified
---------------------
"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche

Last edited by boneheaddoctor; 11-17-2005 at 04:15 PM.
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  #7  
Old 11-17-2005, 07:40 PM
Austin85's Avatar
Smells like Diesel..
 
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Location: Boca Raton, Fl
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Quote:
Originally Posted by boneheaddoctor
Around the filler neck? I would expect teh see a small increace in bubble size when off...but draining back is telling me you have a air leak which is bad....you need to find that for sure. THat will be between the filter and the engine most likely.

THe "Stopper" gasket I am not sure what you mean....It might be to keep the elements out as tank is inside the car....that is one I would not worry about. I am assuming you mean where the return line and tank breather go inside to the tank.
Yes, it's the gasket at the return line and other line next to it.
If there is a leak of air between the primary and the engine..?? Does the manual primer pump have a closed or lock position? Possible air getting in through there???
__________________
'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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  #8  
Old 11-17-2005, 08:35 PM
boneheaddoctor's Avatar
Senior Benz fanatic
 
Join Date: May 2004
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Posts: 16,007
Quote:
Originally Posted by Austin85
Yes, it's the gasket at the return line and other line next to it.
If there is a leak of air between the primary and the engine..?? Does the manual primer pump have a closed or lock position? Possible air getting in through there???

If you have the old style primer pump (the one with the white cap you unscrew and pump)..do you see fuel leak when you pump it? If so replace it. if its the black one that is like a sleeve that covers the inner parts that is the new style and unlikely at isse. Are your rubber lines at the primary old or new? and have the hose clamps been tightend so tight they cut into the rubber?


The Old stlye pump screws and locks in the down positiion..it has a knurled rim.

THe new style does not lock.....looks like a small hotdog stuffed on a spike. Here is a new style photo

__________________
Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
---------------------
Section 609 MVAC Certified
---------------------
"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche
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  #9  
Old 11-18-2005, 02:56 AM
Austin85's Avatar
Smells like Diesel..
 
Join Date: Jun 2005
Location: Boca Raton, Fl
Posts: 2,720
Quote:
Originally Posted by boneheaddoctor
If you have the old style primer pump (the one with the white cap you unscrew and pump)..do you see fuel leak when you pump it? If so replace it. if its the black one that is like a sleeve that covers the inner parts that is the new style and unlikely at isse. Are your rubber lines at the primary old or new? and have the hose clamps been tightend so tight they cut into the rubber?


The Old stlye pump screws and locks in the down positiion..it has a knurled rim.

THe new style does not lock.....looks like a small hotdog stuffed on a spike. Here is a new style photo

It's a black top so it's new and doesn't leak.
and the lines are old and the clamps are tight....
__________________
'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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