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#1
10-18-2004, 01:28 PM
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Fuel Filter Change '84 300D
Hello All:
It's been about 2 years and 10K miles since the fuel filters have been changed on my sons '84 300D. This will be the first time I've done it myself. I figured I do it this weekend before the weather turns too cold. Any things to look out for when doing this? Any trickes? I'm planning on changing both the in-line & spin on filter. After the new filters are in place - do I just use the manual thumb pump to remove any air in the system? Thanks in advance, Kbike
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01 VW Passat 4motion 99 VW Eurovan 84 MB 300D 93 BMW K1100RS 
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#2
10-18-2004, 01:53 PM
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Fuel Filter
The in-line filter is a no brainer. The spin on filter, loosen the big nut on the top of the housing, then spin the filter off. Install both filters leaving the big nut a little loose. Then turn the hand pump counter clockwise and pump till the air bubbles go away. Should take 5 -6 pumps. Then tighten the big nut. Also tighten the hand pump clockwise. Start car and check for leaks. It's easy.
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1984 300D Turbo Sedan (Hilda) 272,115 miles.....  Anthracite Gray/Palamino Leather, I am 3rd owner 2001 Dodge Stratus (Silver) (wifes) 55814 miles...  1982 280TE Wagon Astral Silver Metallic/ Anthracite Velour 260,512 miles (Eva) 1969 230 Sedan Olive Green/Black MBTex 4 Speed Manual 84,213 miles ???? Haus Frau 2004 Boreem Ninja Pocket Bike Highly Modified 49cc (Ling Ling) Einigkeit und Recht und Freiheit
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#3
10-18-2004, 02:42 PM
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yep, it's easy...
Takes about 15 minutes.
The bolton the filter is 24mm, and make sure you fill up the new filter with fuel from the old one...makes for less pumping on the manual pump. I usually have my wife crank on the engine will I pump the manual pump to primer the engine, seems to work faster that way. Good Luck.
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#4
10-18-2004, 05:36 PM
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As has been said, this is really easy. The only thing I'd add is to be ready to plug the fuel line when you remove the inline filter, otherwise fuel will leak everywhere.
I would recommend removing the main fuel line where it enters the inline filter FIRST, plug the line, THEN remove the filter from the pump. If you do it in this order you won't be stood holding the inline filter with fuel gushing from the end. I did both mine in the dark for the first time a few days ago, and it was a 10 minute job. Kevin
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'85 300SD
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#5
10-18-2004, 08:23 PM
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When you do the in-line filter, purchase 2, one for a spare to keep in the glove box or trunk. A one time incident with dirty fuel can leave you stranded without a spare.
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Sam 84 300SD 350K+ miles ( Blue Belle )
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#6
10-18-2004, 08:45 PM
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My hand pump leaks so bad it doesn't work so I filled the new spin on with diesel , cranked it up and as soon as it fired started pumping the throttle. It was wanting to die on me but I just kept pumping the throttle and it cleared up in a minute or so.
Benzzy-I'm gonna try your method next time. Cheers, Bill
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#7
11-15-2004, 02:58 PM
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Quote:
Thanks. 
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#8
11-15-2004, 03:19 PM
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If you have a w123, it is on the injection pump. 2" knob, towards front of the pump. Unscrew it--counter clockwise---and pump up/down. Don't forget to tighten it back down. Then tighten the bolt on top of the filter.
BUT, if yours is anything like mine, it probably doesn't work. You'll know it doesn't if fuel starts squirting out around the stem of the pump. You can buy a replacement pump [aftermarket] or just fill your filter with fuel, install the filter, and crank it, being prepared for stall. I keep mine revving to keep it from stalling because if it does [stall] you'll wear your starter out cranking it. Takes a lot of cranking to pressurize the system again. Hope this helps... Cheers, Bill
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