74 450SEL fuel accumulator - Mercedes-Benz Forum

 
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post #1 of 7 (permalink) Old 01-03-2008, 10:00 AM Thread Starter
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Post 74 450SEL fuel accumulator

I'm stumped. I have a bad fuel leak on my 450SEL and I'm not sure what I need to replace. The leak is back under the fuel tank. I've replace the hose (which was leaking) from the tank to a 'thingy', (about 3 1/2 inch diameter, 1 1/4 think, in and out connectors) which connects (I think) to the fuel accumulator which in turn is connected to the fuel filter. My question is, do I have these items correctly identified? My manual only show a picture of hte assembly but doesn't identify anything. I'll pick up a fuel filter and replace it this weekend but due to the cost of the fuel accumulator, I obviously don't want to pick one up unless I need it.....

Robert
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post #2 of 7 (permalink) Old 01-03-2008, 10:27 AM
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Perhaps this will help...
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"If spending money you don't have is the height of stupidity, borrowing money to give it away is the height of insanity." -- anon
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post #3 of 7 (permalink) Old 01-03-2008, 09:18 PM Thread Starter
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Yes, thank you, that's really good. I'm 90% sure I've got everything identified but now have one question, not that I think I'm having problems with it, but where's the fuel pump? It certainly doesn't look like it's inside the tank where I thought it was..........

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post #4 of 7 (permalink) Old 01-03-2008, 09:36 PM
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The pump is #328.

"If spending money you don't have is the height of stupidity, borrowing money to give it away is the height of insanity." -- anon
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post #5 of 7 (permalink) Old 01-05-2008, 05:08 PM Thread Starter
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sigh, sadly, I've found that's correct. The reason I'm sad now is that having had the time to drop the assembly out, I've discovered my problem is the pump It's leaking around the electrical connector........... Well, I've got one ordered so it'll be here in a few days, then my baby will be happy again!

Now I'm having second thoughts about some of the issues I've had in the past like poor performance, gas mileage and the mysterious problem of it running out of rpms at about 32 -3500. People I've talked to say it should go like a rocket on the freeway but it's more like a windup toy. It cruises okay, just takes a while to get there...........
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post #6 of 7 (permalink) Old 01-05-2008, 07:46 PM
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From the parts illustration, this fuel pump appears to be similar to the Bosch fuel pump Volvo used in 1975. I recently replaced the fuel pump on my 1975 245 Volvo wagon because the motor housing started to leak fuel. The motor is cooled by the flow of fuel! 30 years of occasional water in the fuel finally rusted it out. I actually replace the o-rings to the pump portion first as I was convinced the seals were leaking.

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1973 280 W114 (Driver - 140,000 miles)
1974 280C W114 (Now running - driven off and on this summer)
1968 200D (Engine rebuild planned)
1964 200 (gasser parts car) & 1966 200D (complete car - Got to run. Now to see if clutch can be repaired.)
1980 300D W123 (Parts car - engine runs, but trashed)
1981 240D W123 4 speed ( In sad shape when bought - many parts from '80 300D has back on the road. Needs work, but shows promise.)
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post #7 of 7 (permalink) Old 01-05-2008, 07:58 PM
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Yes, anything with EFI injection used pretty much the same fuel pump, with a few minor variations. We offer remans for $179 and still sell quite a few of them after all these years.

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