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#16
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It's the nature of diesel to foam when agitated. Just try not to let the nozzle/trigger pump at full force when you're almost to the top of the tank. The foam subsides quickly. It is of no consequence, really
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62 220sb 67 250S 72 280SE 4.5 74 280C 77 300D 82 240D 85 190E 2.3 86 300E RIP 12/28/09 85 300SD 92 300D 2.5 00 E320 Current Over 1,000,000 miles in Benzes, Since66 ....and a whole passel of BMW 2002 and Tii |
#17
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If you are saying that you can't even fill at full blast for 5 seconds on an empty tank, then there has to be something going on here. Maybe I am wrong - it surely wouldn't be the first time, but this sounds very strange to me. The fact that some people experince this (although this sounds like an extreme version) and some do not, tells me that there are some variables at play. Yes, your tank has a vent, not sure where it is located on your model though. I would think that it might have something to do with this, so figure out where it is and make sure it isn't clogged.
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'95 E300D ("Tank") - 231,000 miles '79 240D ("Biscuit") - 197,250 miles (Sold) '83 240D ("Ding-Ding") - 217,000 miles (Death by deer) ______________________________________ "Back off, man. I’m a scientist” ~ Peter Venkman |
#18
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Is the wagon tank shaped significantly differently than the sedan tank with which most people are saying "it's not an issue"? I'm envisioning a differently shaped tank causing an increase in natural foaming simply by nature of how it's built.
I've never heard of any type of algae problem or any such "cure-able" occurrence for this problem. Maybe pull your tank out of the car and inspect it, shine a flashlight into it, look for trouble, deformations, etc? That's the only thing coming to my mind. There's not a "super-foaming bug" you can clean out of the tank, that I've ever heard of. |
#19
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So, here are my next steps: Research where the tank vent is for the wagon and inspect it. Try 79Mercy's method to listen for a suction sound. If all else fails, pull tank and have steam cleaned by radiator shop. I'll keep you posted on how I progress. Meanwhile, if another wagon owner knows where the tank vent is located and routed, I would be greatful.
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84 300td (Yes, a wagon) "The Golden Dragon" 195k, 2nd owner Lives in Redmond, WA |
#20
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ideas for foaming....... (NOT FOAMING....)
I thought diesel foamed a lot when I first got my car.
I usually start out fast, then slow down as it fills up. this has minimized the foaming concern. When I have time, I top off, otherwise, it's about a 3 gallons short of a fill. I think this is mainly due to the venting system. For your foaming problem... I have an idea.... Go buy a funnel... with a screen in it. good sized one, or put an extension hose on it. Find one like you might use to fill a race car (like for a sprint or modified car). they are big, they have a screen. Try to figure out what is foaming... does the fuel foam in the funnel.. or does it foam after it hits your tank. Perhaps the screen will help deairate the fuel before it hits the tank. just an idea..... |
#21
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Is the flap inside your filler tube opening fully? It's operated by vacuum. On the wagon you can open up the first aid/jack compartment - right side rear and tie open the flap with a wire on the vacuum switch. Then try filling it again. Good Luck, Joseph |
#22
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Are you talking about the fuel filler door? You wouldn't be able to fill up the car without getting to the fuel cap...
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TC Current stable: - 2004 Mazda RALLYWANKEL - 2007 Saturn sky redline - 2004 Explorer...under surgery. Past: 135i, GTI, 300E, 300SD, 300SD, Stealth |
#23
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The flap is located about one foot down the filler tube. May be designed to stop crooks from stealing fuel with a hose - at least my 1985 300td has this setup - not sure about other years Joseph |
#24
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Excessive foam and a very slow fill sounds like a fill tube restriction...
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Joe 1998 E300D turbo 240K + Miles 2000 Dodge Dakota 122K + Miles 1992 Mazda Miata Autocross Machine 143K + Miles http://www.renegademiata.net Any man who is under 30, and is not a liberal, has no heart; and any man who is over 30, and is not a conservative, has no brains. - Winston Churchill |
#25
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Hm interesting, I never knew that was a feature. My SD doesn't have that to my knowledge, the only thing pulling the lever does is allow the filler door to open. The filler "neck" is only a few inches until it opens up into the tank. I can shine a flashlight down and see the entire thing.
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TC Current stable: - 2004 Mazda RALLYWANKEL - 2007 Saturn sky redline - 2004 Explorer...under surgery. Past: 135i, GTI, 300E, 300SD, 300SD, Stealth |
#26
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That's just the point. When the flap is closed, the fill tube is restricted. Joseph |
#27
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The 300td wagon has a flat tank underneath. It also has a separate expansion tank in the first aid/jack compartment at the right rear. When i shine a flashlight in my filler tube I can just see part of the flap where the filler tube begins to bend toward the tank. The flap is opened by vacuum and if not working correctly makes the tank very hard to fill - just as the OP complained. Must be a differant system entirely from most other models. Joseph |
#28
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That's very interesting, I hadn't heard of that feature - a vacuum operated flap in the filler tube, huh? As you suggest, I guess the feature would be to deter fuel thiefs, but that still seems strange if the fuel door locks via vacuum with all the other doors and the trunk. It really sounds like this must be the problem - it would certainly seem to explain the OP's inability to fill for a even a few seconds without overflowing with foam and the incredibly long time it takes to fill the tank. The length of time stated for the foam to subside is then likely due to slow draining of the fuel past this flap. It will be interesting to see if this is indeed the problem - almost seems like it has to be.
__________________
'95 E300D ("Tank") - 231,000 miles '79 240D ("Biscuit") - 197,250 miles (Sold) '83 240D ("Ding-Ding") - 217,000 miles (Death by deer) ______________________________________ "Back off, man. I’m a scientist” ~ Peter Venkman |
#29
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The fuel door doesn't lock on the 1985 300td. It opens by just pressing on the right-hand side of the door and it pivots open. It is the flap down inside the filler tube that opens/closes via the vacuum system. Joseph |
#30
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Well, there you have it - I didn't know that. I guess you learn something new everyday. Thanks.
__________________
'95 E300D ("Tank") - 231,000 miles '79 240D ("Biscuit") - 197,250 miles (Sold) '83 240D ("Ding-Ding") - 217,000 miles (Death by deer) ______________________________________ "Back off, man. I’m a scientist” ~ Peter Venkman |
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