W123-200 fuel pump | Retro Rides

w123fromnew Part of things Posts: 11	W123-200 fuel pump w123fromnew @w123fromnew
	Nov 14, 2014 16:18:17 GMT Select Post Deselect Post Link to Post Back to Top
	Hi, after troubleshooting problems with running, and then starting, I found that the composite base under the fuel (petrol) pump seems to be at fault. All the ridges outside where the two O-rings sit had broken away. Tried to show this by circling affected areas in red; Is this a common problem? Am I right thinking that the bits have broken off due to over-tightening the nuts that hold the fuel pump in place? Ta
	Last Edit: Nov 15, 2014 1:52:23 GMT by w123fromnew: edit: managed to identify link to bigger picture Motorised transport: two on 4, three on 2, and one on 0 wheels

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bortaf Posted a lot Posts: 4,549	W123-200 fuel pump bortaf @bortaf
	Nov 14, 2014 17:14:35 GMT Select Post Deselect Post Link to Post Back to Top
	Over tightening can do it but those composite spacers deteriorate with time and many heat/cooling cycles as well, if it's new then probably over tightened.
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w123fromnew Part of things Posts: 11	W123-200 fuel pump w123fromnew @w123fromnew
	Nov 14, 2014 23:08:42 GMT Select Post Deselect Post Link to Post Back to Top
	Thanks bortaf, I don't think the base has been replaced (not a routine servicing component, AFAIK), so approaching 30 years old. What I was wondering about was if after a couple of decades of cooling/heating cycles, do they all get brittle and fail that way - or is what I see unusual?
	Motorised transport: two on 4, three on 2, and one on 0 wheels

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bortaf Posted a lot Posts: 4,549	W123-200 fuel pump bortaf @bortaf
	Nov 15, 2014 20:44:00 GMT Select Post Deselect Post Link to Post Back to Top
	Had a few that cracked all the way through bacause of age and overtightening, new ones will squash a bit if overtightened, old ones tend to crack or shatter, it's sort of 6 of one half a dozen of the other IME
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