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Old 10-18-2001, 06:54 PM
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Join Date: Aug 2001
Location: Santa Maria, CA
Posts: 49
Fuel Accumulator Failure?

In doing some checking of my car's fuel system, I removed the VENT hose from the fuel accumulator on my '86 190E 2.3-16V. I had a suspicion that the accumulator might be bad.

The vent hose should have little else but fumes in it. When I pulled off the hose, fuel poured out (engine off).

Question: where does this vent hose go, and could something at the other end cause fuel to be in the vent line?

The fuel accumulator can't be completely shot, since the car does run. It is just slow to start when cold, and sometimes very hard to start when hot.

Any expert thoughts?? The manual shows no detail on where the vent line goes.

Tom Elerding
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Old 10-18-2001, 08:40 PM
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Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
It is ok for fuel to be on the back side of it because the little hose goes directly into the main fuel line that is full of fuel. As the accumulator fills and displaces the air on the back of the diaphram, it will fill with fuel.

The only way to check is to pull it out and see if there is any restriction between the front and rear chambers. If not, it is faulty.
Donnie Drummonds
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Old 10-18-2001, 11:56 PM
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Join Date: Aug 2001
Location: Santa Maria, CA
Posts: 49
Fuel Accumulator Connection


Thanks for the reply. I just found not 10 minutes before this reply a diagram which shows that the vent line does connect back to the fuel supply line. It did not appear so under the car, but I'm sure that is the case.

A Bosch diognostic manual said to check the vent line. But Mercedes connected that vent line into the fuel supply, so the test is invalid.

Oh well, back to the drawing board. I'll probably pull it out to check it, since I don't yet have a Bosch-compatible fuel pressure gauge.


Tom Elerding
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