fuel pump

[joelj]

Hi Group,

Has anyone used a different furel pump on the pagoda other thatn the original one? My mechanic says I can install the one from a later benz model and  achieve a better flow than the original.

Has anyone tried this and has it worked better for your car? what are the drawbacks?

Thanks



1969 280sl auto
White exterior
Blue interior

[rwmastel]

I remember some people here doing that, hopefully they will read your post or you can find their threads with a Search.

One drawback would be figuring out how to mount it to the car, you would need a custom bracket.  Second, I don't know if you need "better flow" because any excess fuel getting the the injection pump gets recirculated back to the fuel tank.  The fuel pressure to the injectors is provided by the injection pump, not the fuel pump.

Rodd
Powell, Ohio, USA
1966 230SL, Euro, Auto, Leather, both  tops
1994 E420

[paul in Arizona]

Several years ago a very competent MB mechanic said I should replace my '71s failing fuel pump with one of a more recent type because it was "better".  Mounting it was not overly difficult but it didn't look "normal".  I could often hear it pumping but most of the time there was no difficulty.  However, the car would unexpectedly stall every month or two.  I had two other mechanics look at the car and they couldn't find any answer.  Ultimately, yet another guy said he looked up the fuel delivery pressure and that the newer pump's pressure was wrong.  I replaced it with an OEM spec. pump and have not had the stalling recur.  I can't tell you the details of the difference in delivered pressure betwen the OEM and new pump.  Something to look up.
If this anecdotal episode is any indication I'd be inclined to go with the [more expensive] original pump type.

[rwmastel]

Joel,

If your existing pump has a problem, it can be repaired.  Do a Search here on "repair fuel pump" or "rebuild fuel pump".

Rodd
Powell, Ohio, USA
1966 230SL, Euro, Auto, Leather, both  tops
1994 E420

[George Des]

Rodd's right on this. There is a lot of info regarding fuel pumps on the Board. The original fuel pumps are low pressure pumps designed to get the fuel to the FI pump where it is pumped under high pressure to the individual injector nozzles. Several people who post have been successful in using replacement pumps, but have had to find a way to mount them using a variety of different bracket arrngements. The newer style, small original pump is still available through MB and other parts sources but is very expensive--about $450, but you can often find deals on these by shopping around. The older, large style pump is no longer available, but both can be rebuilt if not too far "gone". By using one of the two original style pumps you avoid all sorts of mounting and running issues.

George Des

[Shvegel]

I used a fuel pump from an early Saab 900 (circa 1987 900 turbo) I had a used on laying about with the nice waterproof wire connectors etc so I put it in about 4 years and 20,000 miles ago. Hasn't failed yet.

[KevinC]

I purchased a rebuilt pump from www.300sel.com. They had the mounting bracket I needed, too. 1 year warranty and no issues.  

Kevin Caputo
Boca Raton, FL
1967 230 SL Automatic
670 Light Ivory
113 Bronze/Brown MB Tex

[joelj]

Hi group,

thanks for the posts . I have searched the site and found a lot of information on rebuilding the fuel injection ...thanks

BTW Kevin, may i ask how much you paid for the rebuilt fuel pump? Is that the exact same one found in our pagoda?

Thanks

Joel

1969 280sl auto
White exterior
Blue interior

[KevinC]

Joel,

As memory serves, around $300; again, that's with the same warranty as a new one. My local MB shop charged $68 for installation. I paid extra for overnight delivery so the car was out of commission only for two days. Apparently, the 300 SEL's they specialize in and our cars share the same pump so "yes" to originality. They will want your pump as an exchange so that they can rebuild it for their inventory.

Kevin

quote:Originally posted by joelj

Hi group,

thanks for the posts . I have searched the site and found a lot of information on rebuilding the fuel injection ...thanks

BTW Kevin, may i ask how much you paid for the rebuilt fuel pump? Is that the exact same one found in our pagoda?

Thanks

Joel

1969 280sl auto
White exterior
Blue interior

Kevin Caputo
Boca Raton, FL
1967 230 SL Automatic
670 Light Ivory
113 Bronze/Brown MB Tex

[hands_aus]

quote:Originally posted by joelj

Hi group,

thanks for the posts . I have searched the site and found a lot of information on rebuilding the fuel injection ...thanks

BTW Kevin, may i ask how much you paid for the rebuilt fuel pump? Is that the exact same one found in our pagoda?

Thanks

Joel

1969 280sl auto
White exterior
Blue interior

joelj,

The fuel pump in your car might be the new small type pump that was fitted to the 280sl model.

I see that KevinC has a 230sl.

Compare this pic to your pump then you will know what model you are asking about.
It shows the new small pump. note that it has the exiting pipe going up at about 60 degrees.

Download Attachment: FuelPumpFilter.jpg
68.45 KB

Either way, both the old style and new style pumps can be rebuilt for a fraction of the cost of a new pump.

For the later pump like the one shown, MB sells a kit containing seals and brushes for the motor.

Kit Part number A000 586 01 47  from 280sl model number 15765

Bob Smith (Brisbane,Australia)
RHD,1967 early 250 SL, auto

[KevinC]

I purchased the smaller later pump. My car was equipped to receive it as the taller pump must have been replaced long ago (have 135k miles on the odometer currently). The car had the shorter pump and the adaptor in place so the change was relatively simple. 300sel.com also sells the the adaptors for the small pumps, as well.  

Kevin Caputo
Boca Raton, FL
1967 230 SL Automatic
670 Light Ivory
113 Bronze/Brown MB Tex