Fuel Accumulator - Mercedes-Benz Forum
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#1 (permalink) Old 11-14-2012, 10:24 AM
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Fuel Accumulator

Should the fuel accumulator make a hissing sound after you turn car off? I changed out the fuel tank strainer (whic was not cloged, look pretty clean) but now when car is hot 90 + mark, hard to restart after 20-30 minute car is off? Sounds like no gass or too much gas? Fuel pump seems to hum just fine? One time (not at band camp), car was warmend up (90+), shut car off for about 1/2 hour hard to restart, there was a gurgling noise from gas tank? Bad Fuel Accumulator, bad vocuume line problem? Once car is restarted, runs great? Ha?
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#2 (permalink) Old 11-14-2012, 11:27 AM
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Originally Posted by littlered380sl View Post
but now when car is hot 90 + mark, hard to restart after 20-30 minute car is off?
Hard starting when hot after 20-30 minutes is usually the accumulator. Easy swap.
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#3 (permalink) Old 11-14-2012, 12:10 PM
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Add to that the gurggling sound in the tank, indicative of a internal diaphragm leak in the accumulator sending fuel back to the tank, and it sure does sound like the fuel accumulator has failed.
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#4 (permalink) Old 11-14-2012, 12:25 PM
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Accumulator should keep the fuel pressure up. Without high pressure the engine heat will vapour the fuel.

The gurgling noise is from fuel return line, the returned and vapourized fuel makes bubles inside the tank.

Yka
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#5 (permalink) Old 11-14-2012, 12:33 PM
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I may have had the wrong understanding, but I thought that the line leaving the rear of the accumulator was a safety feature that channeled fuel back to the tank in the event of a ruptured FA diaphragm to prevent it from pouring out on the ground. In any event, my cold start problems and tank gurgling stopped with the replacement of my FA.
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#6 (permalink) Old 11-14-2012, 12:38 PM
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"One time (not at band camp), car was warmend up (90+), shut car off for about 1/2 hour hard to restart, there was a gurgling noise from gas tank"

This statement makes me to suggest the possible hot engine vapour lock and the returning fuel vapour makes the bubbling noise inside the fuel tank.

My fuel accumulator was broken, I had also serious difficulties to start the hot engine again.

Yka

Last edited by yka; 11-14-2012 at 01:06 PM.
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#7 (permalink) Old 11-14-2012, 12:57 PM
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Originally Posted by 1st 560SL View Post
I may have had the wrong understanding, but I thought that the line leaving the rear of the accumulator was a safety feature that channeled fuel back to the tank in the event of a ruptured FA diaphragm to prevent it from pouring out on the ground. In any event, my cold start problems and tank gurgling stopped with the replacement of my FA.
You are correct, but I'm thinking he's talking about the fuel return line from the engine rather than from the accumulator.

Alan
If it doesn't fit, force it.
If it breaks, it needed replacing anyhow.
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#8 (permalink) Old 11-14-2012, 01:32 PM
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Thanks for the clarification YKA and Abiby, I had FA on the brain and wasn't thinking of the fuel return circuit from the engine. My bad!
John
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#9 (permalink) Old 11-14-2012, 02:15 PM
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Thanks everyone, will order part today. I'll get back to you on the outcome.
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#10 (permalink) Old 11-14-2012, 06:16 PM
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I would replace a check valve as well, cheap and it all there anyway.
Accumulator is your problem, I had the same problem, 5 month ago.


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