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#1
03-23-2011, 03:26 PM
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Main fuel filter leaking on top. Am I missing something?
Hey, all, the 83 300SD I've been working on seems to have fuel leaking onto the top of the main screw on filter. I didn't pull the bolt when I changed the filter, but is there supposed to be a washer or seal under the top bolt? I re-tightened it, but there is still a little fuel coming from someplace and setting on top of the filter housing (head). The filter is a new one I installed, and I don't remember if was leaking when I got it or not. Can't find an exploded view of this. Does anybody have any idea what might be the cause of the leak? Thanks.
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"Knowing is not enough, we must apply. Willing is not enough, we must do." Goethe *********************************** 1951 Chevy 3100 2003 Indian Chief Roadmaster 1983 GMC 1 ton Dually 1982 Chevy 1 ton Dually, service body (sold) '90 GMC Suburban 6.2 "SS Veg-Burban" (single tank WVO\diesel conversion) SOLD '81 300D ~ Mama's car...my job (now my car)(but still my job) SOLD '83 300sd ~ rescue car SOLD 2005 Ford Taurus (Mama's new car)(NOT my job!) 
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#2
03-23-2011, 03:33 PM
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If this is the copper ring on the banjo connection above the secondary spin on filter - then you are advised to replace it. However I'd just take it apart - clean it up - and see if it will reseal. If it is bent / distorted change it. Don't over tighten the nut.
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1992 W201 190E 1.8 171,000 km - Daily driver 1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone 1965 Land Rover Series 2a Station Wagon CIS recovery therapy! 1961 Volvo PV544 Bare metal rat rod-ish thing I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior  Don't leave that there - I'll take it to bits!
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#3
03-23-2011, 04:08 PM
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Be sure to replace the rubber "O" rings on the big banjo bolt too.
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83 SD 84 CD
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#4
03-23-2011, 04:10 PM
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And if the banjo bolt has two o-rings, it does not need the copper washer...
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'85 300TD "Puff The Magic Wagon" - Rolling Resto '19 Mazda CX-9 Signature - Wife's sled '21 Morgan 3-Wheeler P101 Edition '95 E300d - SOLD '84 300TD "Brown Betty" - Miss this one '81 240D "China Baby" - Farm grocery getter
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#6
03-23-2011, 05:59 PM
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Wouldn't that have been in the new filter box? I've got spare copper and steel rings everywhere from my oil changes. Since I didn't pull that bolt, I didn't check under it. The filter has it's own seal. Never had this problem with my 300d. (The one in question is a turbo, but I don't think that makes any difference on the fuel line. Anybody got any manual pics? I'm looking for my cd on these things. As usual, it's hiding under all of that other "real important" clutter.
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"Knowing is not enough, we must apply. Willing is not enough, we must do." Goethe *********************************** 1951 Chevy 3100 2003 Indian Chief Roadmaster 1983 GMC 1 ton Dually 1982 Chevy 1 ton Dually, service body (sold) '90 GMC Suburban 6.2 "SS Veg-Burban" (single tank WVO\diesel conversion) SOLD '81 300D ~ Mama's car...my job (now my car)(but still my job) SOLD '83 300sd ~ rescue car SOLD 2005 Ford Taurus (Mama's new car)(NOT my job!)
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#7
03-23-2011, 06:21 PM
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Quote:
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#8
03-23-2011, 06:22 PM
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I had the same problem with my 300 SD. Been a good while back and my memory is a bit fuzzy on particulars, but --- best I can recall the washers that came with the filter did not fit the bolt. I made one from some spare gasket material and all has been well for a long while (long enough for me to forget details). At any rate, it was easy.
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John Schroader bio burnin' 83 300D, '83 300 SD, '79 240D "I've never met a man who was good at making excuses who was good at anything else" Ben Franklin "You cannot permanently help a man by doing for him what he could and should do for himself" Abraham Lincoln
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#9
03-23-2011, 06:39 PM
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Change those O rings
Go to your local auto parts store or Harbor Freight and get a metric selection box of O rings. Changing the O rings each time you change the fuel filter is a good thing. The copper ring goes under the head of the bolt... (Belt and suspenders)
The same goes for any place you have any O rings. Remove and replace the hard old rings with new ones. It's just a good practice. Pete
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Pete Williams, President emeritus - MBCA-International Stars (Eastern Mich.) Now Wi. & Az. 1985 300D Manual 4 speed Green Hen's tooth 1979 MGB triple black Az car nice 1969 back 1/2 of MGB (Az home built trailer) 1991 Volvo 245 Wagon Nice AZ Restored Gold Brick 1983 Jeep CJ7 37,600 Miles Summer use only
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#10
03-23-2011, 06:55 PM
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The filter does not come with the crush washer, as this is for the old style banjo bolt.
I have used a #30 cap thread gasket I purchased from the local hardware store.
__________________
83 SD 84 CD
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#11
03-23-2011, 09:47 PM
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83 should not have any o-rings on the fuel filter bolt... just an aluminum crush washer.
what's the part # on the filter base? if it ends in 01 it's just got the crush washer. standard oil filter copper ones will work, the plastic ones may even work, not totally sure though.
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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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#12
03-23-2011, 10:14 PM
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Quote:
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#13
03-24-2011, 02:11 AM
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Copper washers are the way to go..........they seal better.
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Wie lange wird Ihr Auto leben? 
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#14
03-24-2011, 11:18 AM
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The red arrow is pointing to the "02", as you see there are two "O" rings on the banjo bolt.
A filter head with an "01" will need a crush washer. One like the one in the pic is still on my old 240, its made of a composite material.
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83 SD 84 CD
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#15
03-24-2011, 11:55 AM
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Quote:
__________________
1992 W201 190E 1.8 171,000 km - Daily driver 1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone 1965 Land Rover Series 2a Station Wagon CIS recovery therapy! 1961 Volvo PV544 Bare metal rat rod-ish thing I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior Don't leave that there - I'll take it to bits!
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