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#1
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w123 280ce tank return pipe orifice clogged
My brother is resurrecting a euro 280ce. There is an orifice in the tank return pipe that is clogged. Any thoughts on how best to tackle this ? The tank is out.
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---------- 1986 250D 5-speed, 210,000 http://images.spritmonitor.de/407216_21.png 1986 300E 112,000 |
#2
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Compressed air?
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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! |
#3
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No joy on using either pressure or vacuum to clear the blockage. My brother has a good 240d tank, but it doesn't have the orifice. I can make something on my lathe -- anybody have any idea of the appropriate hole diameter ? Since were 500 miles apart, trial and error would be a slow process.
Geoffrey
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---------- 1986 250D 5-speed, 210,000 http://images.spritmonitor.de/407216_21.png 1986 300E 112,000 |
#4
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gmb:
The opportunity to place ignorance on display cannot be passed up: Why is there a restriction in the return line? Such has not been observed elsewhere. |
#5
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Quote:
Fuel Tank Strainer, Fuel Tank Insides, Swirl Pot, Return Line Venturi - Mercedes-Benz Forum The venturi gets clogged -- in this case after sitting for several years. There's no direct access and it can be challenging to unclog.
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---------- 1986 250D 5-speed, 210,000 http://images.spritmonitor.de/407216_21.png 1986 300E 112,000 |
#6
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case closed
Using a 2+ foot section of aircraft cable spinning in reverse with a drill succeeded in rooting out the blockage.
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---------- 1986 250D 5-speed, 210,000 http://images.spritmonitor.de/407216_21.png 1986 300E 112,000 |
#7
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Quote:
This Pelican link is about the Porsche swirl pot which is similar, but not exactly same as those on Benzes. It has pics that show the fuel entry aperture adjacent to the return line, more clearly. CIS Gas Tank - Pelican Parts Technical BBS
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Graham 85 300D,72 350SL, 98 E320, Outback 2.5 |
#8
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This thread prompts a question:
What chassis and engine combinations were fitted with tanks which included a swirl pot? |
#9
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At least R/C107s and W123s. Probably most Benzes of that era? Gassers at any rate.
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Graham 85 300D,72 350SL, 98 E320, Outback 2.5 Last edited by Graham; 05-30-2016 at 06:21 PM. |
#10
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The OP indicated that an available 123 diesel tank did not have the "restriction" feature.
How about carbed gassers? Return flow is very small. |
#11
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He didn't say what year, but if tank has a fuel return nozzle, it would likely be a Kjet. Presumably all kjets and djets had that system.
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Graham 85 300D,72 350SL, 98 E320, Outback 2.5 |
#12
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From my random reading on the subject I too think the swirl contraption is a petrol fuel injection addition (so I don't think carbs and diesels have it)
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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! |
#13
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Yes, it seems one of it's functions is to mix the hot fuel returning from the engine bay with cooler fuel in the tank. Most of these early fuel injected cars had a hot start problem and this probably helped. Porsche and others used a similar set up.
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Graham 85 300D,72 350SL, 98 E320, Outback 2.5 |
#14
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I reckon it is a Bosch CIS thing - probably find a similar system on Ferraris and Lancias too!
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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! |
#15
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And yet, what is probably the largest single marque installed base, Volkswagen w/K-jet, et. seq., seems not to use the device!
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