No fuel accumulator??

[ethanrmerc]

Hi all,

Title is a little dramatic, I'm sure I just can't find it.

I've got a 1973 450 SE up here in Seattle, and am having a warm start issue that I've dwindled down to a bad fuel accumulator.

Hopped under the benz to make sure I ordered the right one, and I can't find it!

Would have expected it to be above the charcoal filter here somewhere, but nothing... I looked all around. Is it possible I just don't have one?

Btw, this is a very early 1973, engine number 178. Does anyone have experience with these early w116's/ know the part number for the accumulator. I checked the ECP, and the diagram shows a fuel accumulator, but it does't list a part number 

As always, thank y'all for your wisdom

-E

[ethanrmerc]

Ah, I finally found the part number from ECP, aptly named "storage" for those concerned. Part number is 0004760121.

And the diagram.

I think my best bet is to buy the replacement and just take the whole fuel pump system out to investigate. Does anyone know if I'll want an empty tank for this, or a good way to clamp off the fuel lines?

-E

[UTn_boy]

The accumulator for all D-Jetronic engines is mounted on top of the rear of the intake manifold under the rear of the air filter housing.  They haven't been available for around 7 years.  Sometimes you'll luck out and find a new one online, but they're usually $400-$1,000.  For now, people are using something aftermarket or they just deal with the hot start issues.  Though, a used one is a possibility, but even then the used ones are eye wateringly expensive.  Knowing they may last a week or years is a huge gamble. 

To find the accumulator in EPC, you'll have to select your car, and then select the engine (117.983), and then click on group 07 (Injection system), and select frame number two (070).  The accumulator is callout number 176.  The correct part number is 000-078-03-89.  What you reference above is for later cars with K-Jetronic fuel injection.  That is why the diagram you're looking at shows no part number.....it's not valid for your model. 

[rumb]

Looks like the line from tank to the damper has an extra brass fitting. That hose will need replaced which means you have to drain the tank.  You can at least change the tank filter then...

Best route is just pull the fuel package and replace everything.

[ethanrmerc]

Thank you for your quick response! New to the EPS... thanks for the info on finding my engine. Now to find an accumulator...

[Randys01]

What a fantastic reply from UTN........!.  would you like him to fit it?!! 

[mrkozzy]

To  UTn_boy

Once again I sit here quietly reading and learning something about my d-jet, something that I never knew.

Thanks again for the input. 

Its helpful to more of us than you realize! 

Cheers

[ethanrmerc]

Just for anyone searching these forums in the future, if you look up the correct part number (000-078-03-89) you likely wont find the right part with the same connections for djet. After a bunch of digging, I found a compatible aftermarket version, Standard Motor Products 16147-05183482, for only $120

Might be speaking too soon though, I'll verify fitment once the part arrives.

I've also seen on other forums for the 450SL that it may be possible to use a 1971 volvo fuel pressure regulator with two ports, you just need a splitter to go to each injector line. Although my physics background fears pressure issues when going down that path...

[UTn_boy]

I believe Volvo used D-Jetronic up to about 1976 on the 164E models.  Though, Ive no idea how the regulators are plumed in.