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  #1  
Old 11-07-2003, 06:54 PM
edge's Avatar
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diesel leaking at/under fuel filter?

I just got in after inspecting my 85 300SD. My son told me there was an oil spot under the car. I popped the hood started the car and notice diesel fuel squirting (like a blood artery) underneathed the spin-on fuel filter. I tightened the spin fuel filter, wrenched tightened the top bolt and bleed it with the hand pump. I then started the car and saw that my efforts did not stop the fuel squirting. It was getting dark so I 'll have to look at in the daylight. Is there anything else underneath there, lines etc. that's squirting other than the fuel filter? Thanks, guys.

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85 300CD Signal Red/Tan sold
83 300D Manganese Brown 109K
97 E420 Midnight Blue 197K sold
98 BMW 328i Vert White 100K, sold
95 BMW 525i White 125K, sold
93 BMW 525iT Red 193K, sold
95 E320 Green Wagon 125K, sold
94 E320 White 127K, sold
85 300SD 156K Grey (Annie), sold
84 300D Lapis Blue 170K (Judy), sold
99 ML 320 Black (lease), 1998 C230 White (lease)
00 Honda S2000 Red (lease)
86 Mercedes 300E (sold)
84 Porsche 911 Red (sold), 1965 Porsche 911 White (sold)
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  #2  
Old 11-07-2003, 07:49 PM
lrg lrg is offline
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Possibilities:

There is a O ring on the bolt that holds the spin on filter in place but that should cause it to leak from the top. If you remove the filter and bolt the O ring is obvious.

It's not unheard of that the filters themselves spring a leak. Did you check the filter before you tightened it?

One other possibility is the cloth covered injector overflow return line. It's a continuation of the series of small hoses that run from injector to injector and although I don't think it's under much pressure the return line that runs from the #1 injector back to the fuel return line could be cracked.

Let us know what you find.
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  #3  
Old 11-07-2003, 10:02 PM
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I second what lrg said. I had a filter develop a small crack once. Sprayed fuel all over the place.
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Last edited by Palangi; 11-08-2003 at 04:14 PM.
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  #4  
Old 11-08-2003, 02:08 AM
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A fuel spray is really dangerous!!
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  #5  
Old 11-08-2003, 08:43 PM
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One word. Tourque. These things take a bit more than you might expect. You’ll need a wrench. Check the rubber seal on the filter, if cracked, buy a new filter. And remember to apply a thin coat of oil on the seal before tightening.
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  #6  
Old 11-08-2003, 11:44 PM
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You tighten the main bolt more, but don't go too far, you could crack the filter mount. I had a leak form the bolt it'self that tightening would not fix. My indy. said that overtightening could crack the aluminum mount. The fix for my problem was a new bolt.
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  #7  
Old 11-09-2003, 02:36 PM
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nylon washer

I replaced the fuel filters two days ago and the secondary filter leaked at the bolt; tightened some more and still leaked. Before I ruined something expensive I replaced the copper washer with a nylon one. Only had to apply about 25 foot pounds to seat and seal; no more leaks!


thebern
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  #8  
Old 11-13-2003, 06:01 PM
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Ok I removed the old filter. The seal looked a little raised and probably wasn't sealing. I think I neglected to tighten the bolt when I changed the filter last time. I only spin tighten it. New filter installed, no leaks. Thanks guys.
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85 300CD Signal Red/Tan sold
83 300D Manganese Brown 109K
97 E420 Midnight Blue 197K sold
98 BMW 328i Vert White 100K, sold
95 BMW 525i White 125K, sold
93 BMW 525iT Red 193K, sold
95 E320 Green Wagon 125K, sold
94 E320 White 127K, sold
85 300SD 156K Grey (Annie), sold
84 300D Lapis Blue 170K (Judy), sold
99 ML 320 Black (lease), 1998 C230 White (lease)
00 Honda S2000 Red (lease)
86 Mercedes 300E (sold)
84 Porsche 911 Red (sold), 1965 Porsche 911 White (sold)
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  #9  
Old 11-13-2003, 07:20 PM
Charlie Mitchel
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Leaking Filter:

I was 800 miles from home pulled into WalMart. Went in and came out and found a three foot puddle under car. It was deisel.
When I cranged the car up it sprayed like a vain. No apperant source. Tried to tighten filter still leaked. Change filter with new one and no leak.
Moral to this story alway carry spare fuel filters.
Charles
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  #10  
Old 11-30-2003, 03:31 PM
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I just changed my filters, now I got leaks from around the bolt at the top. I changed the O ring, got better but still leaks. The washer under the bolt seems to be steel, not copper, is this right? The bleeder pump now leaks too, I guess we're replacing that one.

Brad

300sd 1983
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  #11  
Old 12-01-2003, 12:40 AM
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I don't think there's a washer under the bolt. The O ring on top of the filter is rubber.
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  #12  
Old 12-01-2003, 07:41 AM
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There was a washer on top of the filter housing under the head of the bolt, I beleive thebern said he changed it to a nylon washer. I am checking around town to find a nylon replacement but have not been able to source one. I have cranked this thing down as much as I dare. Any other suggestions or should I go buy another filter.

Brad
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  #13  
Old 12-01-2003, 08:11 AM
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napa or lowes..

has them. if the I.D.is too small use a dremel to enlarge it .

thebern
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1984 300CD 172,483
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  #14  
Old 12-01-2003, 06:40 PM
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Quote:
Originally posted by edge
I don't think there's a washer under the bolt. The O ring on top of the filter is rubber.
agree. hope the new filter is stopping the leak.
btw how's the offers going on your mint SD edge, if it was a little older and a lot less money i might be interested!!
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  #15  
Old 12-01-2003, 08:31 PM
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Hi Bob, I had a guy in Missouri very interested but he topped out at $5k then I hadn't heard from him. Then again, I fixed the driver's seat spring and tuned the AT to shift earlier and if feels like a different car! It was a great car anyways but with the new seat spring installed, it's even better. I bought a set of alloys of Ebay for $60 so I'm am going by way of the set of snows (Kumho) rather than the Honda Element route. I kinda glad no one snapped it up as it's going to last a very, very long time. My next project is to add an Alpine MP3 player and new speakers in the rear.

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85 300CD Signal Red/Tan sold
83 300D Manganese Brown 109K
97 E420 Midnight Blue 197K sold
98 BMW 328i Vert White 100K, sold
95 BMW 525i White 125K, sold
93 BMW 525iT Red 193K, sold
95 E320 Green Wagon 125K, sold
94 E320 White 127K, sold
85 300SD 156K Grey (Annie), sold
84 300D Lapis Blue 170K (Judy), sold
99 ML 320 Black (lease), 1998 C230 White (lease)
00 Honda S2000 Red (lease)
86 Mercedes 300E (sold)
84 Porsche 911 Red (sold), 1965 Porsche 911 White (sold)
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