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#1
05-30-2005, 05:44 PM
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'77 240D getting harder & harder to start
Pump the hand pump and in two/three pumps it completly empties the clear prefilter(?). Two/three seconds the tank refills the filter to about 1/3rd. Is my tank strainer gummed up? If I get the engine started, you can just barely see a bit of fuel in the filter. Used to stay about 1/3rd full....
__________________
Jim '49 170?(donated to church in Darmstadt '58) '58 220S(crusher, after '73 fire[San Antonio]) '72 280SE 4.5 '77 240D '81 300SD '83 240D parts car 
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#2
05-30-2005, 06:26 PM
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have you cleaned the pre chamber of carbon deposits? my car was grounding thru the carbon on the plugs.
but yes the strainer may be clogged with algae and biobor may be called for.
__________________
currently [1981 300 td tdidi 165500 dark brown/palamino-Brownie-mine-3k miles of ownership 1983 240d 162+++ Anthricite grey w/ henna red interior and hella lights-wifes car-Red the above two cars are for sale and can be seen on the cars for sale thread here. pix also available. 240d-144+ Manilla Yellow w/ palmino interior-greasecar kit-Blondie-the college kids car 23" gt 21 speed still on original tires-still got the nubs 21" khs tandem
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#3
05-30-2005, 06:39 PM
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It sounds like you may be sucking in air somewhere, probably in the area of the primer pump or prefilter.
__________________
1982 300D, black w/ palomino leather, 203K 2001 E320, champagne, 105K (Mom's) 1999 Dodge Dakota, squeaky & battered, 142K
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#4
05-30-2005, 06:51 PM
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After you get it started and warmed up... does it run fine then ?
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#5
05-30-2005, 07:06 PM
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hard stuff
sounds like the algae to me.
__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.  [SIGPIC]..I also have a 427 Cobra replica with an aluminum chassis.
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#6
05-30-2005, 10:34 PM
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Your primary question sounds to me like "is my tank filter gummed up". Easy check is to disconnect fuel line at tank and see if fuel flows out pretty well or barely at all. Quick and easy.
 Do your pump up thing with the fuel cap off just to eliminate the possibility of an excessive tank vaccum problem existing first.
Last edited by barry123400; 05-30-2005 at 10:41 PM.
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#7
05-31-2005, 11:43 AM
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Runs to 80/85mph after starting w/exception of
Quote:
__________________
Jim '49 170?(donated to church in Darmstadt '58) '58 220S(crusher, after '73 fire[San Antonio]) '72 280SE 4.5 '77 240D '81 300SD '83 240D parts car
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#8
05-31-2005, 11:51 AM
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If it will run 80 after having problems starting then it is not the tank screen....
I think you do need to pull your glowplugs and check for carbon build up... and check to see that your glowplugs are working in general....
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#9
05-31-2005, 11:52 AM
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I get bubbles/foam in the prefilter if I hold the plunger
Quote:
down after emptying it. Without quoting a post further down - I released the fuel cap when I first noticed the prefilter emptying and pressure almost blew the cap out of my hand. Will hunt for the vent hose today. Looks like pressure would have filled the prefilter sooner rather than slowing down fuel flow.... I just now remembered that we used a fiber washer under the primer pump after buggering up the copper one - will address that also and post results. 
__________________
Jim '49 170?(donated to church in Darmstadt '58) '58 220S(crusher, after '73 fire[San Antonio]) '72 280SE 4.5 '77 240D '81 300SD '83 240D parts car
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#10
05-31-2005, 12:19 PM
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Quote:
__________________
1982 300D, black w/ palomino leather, 203K 2001 E320, champagne, 105K (Mom's) 1999 Dodge Dakota, squeaky & battered, 142K
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#11
05-31-2005, 12:28 PM
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But...
If there is a clog in the line from the tank to the prefilter, the primer pump could have a hard time drawing fuel in. This could force an air leak. Then the primer pump would pressurize the tank via the fuel return line because of the clogged vent. Hmm...
__________________
1982 300D, black w/ palomino leather, 203K 2001 E320, champagne, 105K (Mom's) 1999 Dodge Dakota, squeaky & battered, 142K
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#12
05-31-2005, 01:56 PM
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"If there is a clog in the line from the tank to the prefilter,"
If there is a clog which is hampering starting...then it won't run 80 with the same clog....
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#13
05-31-2005, 02:24 PM
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Quote:
__________________
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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#14
05-31-2005, 02:29 PM
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Do you have the original primer pump, or the newer improved replacement? The reason I ask is that it's about $15, works great, easily installed and nails a potential problem in that area for good.
__________________
'82 300SD - 361K mi - "Blue" "Good judgement comes from experience. Experience comes from bad judgement." listen, look, .........and duck.
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#15
05-31-2005, 02:45 PM
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Quote:
__________________
1982 300D, black w/ palomino leather, 203K 2001 E320, champagne, 105K (Mom's) 1999 Dodge Dakota, squeaky & battered, 142K
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