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Old 03-25-2009, 02:25 AM
Registered User
Join Date: Dec 2008
Location: Southern California
Posts: 19
116 fuel accumulator question

This is on a 1980 280SE

I've had a hot start problem and I'm pretty well convinced the issue is back under the trunk: I'm swapping in a new fuel pressure accumulator and pump check valve. My first question is . . . can the fuel pump be taken apart and cleaned? It looks like the only way in is to uncrimp the metal pinches on the rim and draw out the assembly? Not too much specific info from my thread searches on here. Someone also recommended using diesel fuel to clean, also running it in reverse. Any suggestions would help.

The other question has to do with the accumulator itself. The one on the car has one port on the pressure side. The replacement part has two ports. Here is a photo of an old version on top and the new version underneath.

My arrangement is identical to the lower assembly except for my accumulator. They indicate a "closing cone" as item 29. I'm thinking that's just a plug. I have an email in to Phil to see if there is a single port version available. Anyone familiar with this thing?


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Old 11-22-2009, 12:51 AM
Registered User
Join Date: Dec 2008
Location: Southern California
Posts: 19
resolution, sort of . . .

The car is back together. I was eventually able to find the Y-shaped rigid fuel line through Phil at Fastlane. I believe it is a California-only, or 1980-only variation to try improving the very hot start issue I was having.

123 470 22 64

It is expensive- $134.

I replaced the accumulator (also $$), a bunch of hoses, fuel filter and one of the check valves (the one right at the pump). The hot start issue is still there, though it is not as bad as it was. I have not replaced the other check valve (indicated by item 27/28 in the image) but the car is back on the road and I'm happy with it for the time being. For the record, I never had the courage to plug the fuel pressure gauge into the fuel distributor to really get a handle on whether it was actually a pressure drop that was causing the hesitation on hot starts. I don't like messing with the hard lines going in and out of that thing.

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Old 11-27-2009, 11:26 PM
mak mak is offline
Join Date: Jul 2006
Location: Westfeld .
Posts: 687
very difficult HOT starts on CIS systems can mostly be attributed to a leaky fue; accumulator or a bad fuel fuel pump check valve. Assuming you a good operating pump and a new fuel filter .
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Old 09-16-2010, 11:58 AM
Registered User
Join Date: Sep 2010
Posts: 1
Steel hose

I am looking for the steel hose connector which attaches to the fuel pump, filter and accumulator. Where can I locate one of these, as mine has rusted out completely...


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