Fuel Pump Mounting

[dwilli3038]

I am in the process of replacing the gas tank and lines. My fuel pump is mounted on a circular bracket that is mounted to the car by a single bolt. I am sure this is not the way Mercedes intended it. Does anyone have a picture of the prper mounting for the fuel pump?

Daryl
'64 230 SL
Serial # 508

[George Des]

Daryl,

The mounting on a 230SL depends upon which pump you have--the older,large style or the newer small pump. The old style pump uses a large rubber donut that is surrounded by a two-half bracket. This bracket is suspended by three rubber buffers from a cross shaped bracket that bolts directly to the bottom of the chassis with two bolts. I have seen the smaller pump attached as you describe on 230Sls, but the way it should be attached, especially since your model no doubt originally came with the larger pump, is by bolting the circular adapter plate you describe directly to the cross bracket that is used with the older pump. Owners of newer models that did come originally equipped with the samller pump may be able to shed further light on how the pumps are attached on a car that was designed to take the newer style pump. Hope this helps--George Des

[J. Huber]

Hi George. Well, I had to see what you were talking about so I just ran out to my 30 degree garage and crawled underneath the ol' 230SL. How's that for dedication? [:p]

Anyway, mine seems to have the circular brackets as you describe. And it seems smaller and is more upright than the one shown in my manual. Safe to assume it is the newer style? I looked up my service records and I replaced the old one in '85 (wow time flies) -- anyway part number was 001 091 5201. Can anyone confirm that is the newer style?

Thanks.

And Dwilli -- if I had a digital I could be more help to you.

James
63 230SL

[Naj ✝︎]

Darly
If you have the circular mounting plate (92),you have the later style fuel pump (64). You need mounting bracket (108) which bolts to the chassis. You then bolt the circular plate to this bracket using the square holes to get the correct orientation of the fuel pump. You will need the 3 mounting rubbers (112) which are smaller than the rubbers (110).

Download Attachment: Fuelpmp.jpg
39.19 KB

naj

'Kloines Scheisserle'
65 230SL
68 280SL

[dwilli3038]

Thanks all,

It apears that the PO replacedthe pump with a newer style but did not use the correct adapter to connect the circular bracket to the car. Does anyone have a source for this in the US?



Daryl
'64 230 SL
Serial # 508

[George Des]

James,

It sounds like you do have the newer style pump. I'm not sure of the  MB numbers on the smaller pump, but the Bosch number (imprinted on the top of the pump body) is 0442201002--the larger pumps are 0442200007--there are several variants of this as well. The two pumps differ greatly in their appearance and functioning--the old pump uses a mechanical sealing system to seal the main motor body from the pump section with the main armature shaft running through two small ball bearings--metric sizes 626zz and 627zz. The newer pump has no ball bearings and because it is a "wet" pump i.e. the aramture and brushes (the motor section)  are immersed in the fuel, it has no complicated sealing system like the larger pump.  What really kills these pumps is dirty fuel and varnish build up over years of use. What happens is the varnish and impurities get under the mechanical seal and cause leakage. Also, because the brushes are not constantly being "cleaned" by flowing fuel as in the newer pumps, carbon dust has a tendency to clog up the ball bearings. That being said, the larger pumps are extremely reliable when care is taken to ensure clean fuel and that the car does not sit idle for extended periods. These pumps can be successfully rebuilt with a minimum number of parts provided the main seal is not damaged. The main reason to rebuild is to maintain originality of the earlier cars, so the original shield and brackets will still fit, and I've also heard the pump pressures on the smaller pump are slightly lower and this may cause some FI problems on some cars like the 300s and 600s. The SLS site has a good illustration of the two different pumps and Naj has pointed out correctly how the pump mounts.

George Des

[rwmastel]

quote:Does anyone have a source for this in the US?

Daryl,
Where do you normally get your Pagoda parts?  I would contact 5 or 6 vendors (in the USA) on our vendor list at http://www.sl113.org/data/show_table.asp?table_name=usr_parts_and_service_suppliers

If you talk to that many vendors, you'll find out which ones really understand your problem and can help you with correct parts.

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

[Naj ✝︎]

Darly
The part # for the chassis bracket is 113 470 0081 is German price is Euro 31.15
Just to give you an idea what they're worth.
Good luck
naj

'Kloines Scheisserle'
65 230SL
68 280SL

[George Des]

Daryl--take a look at the SLS diagram for "Tank"--the part you need is #28.  George Des

http://sls.sparebase.de/bin/dbframes.phtml?mid=IN02

[dwilli3038]

Thanks for all the information and advice. The diagrams on the link show it perfectly and are most helpfull. The number on the pump is 0442 201 001, I could not find a part number on the circular bracket (I did not remove the pump from the bracket. The three little rubber parts theat are between the pump and the bracket are part number 126 988 0011 45 24. I checked the vsarious online catalogues for some of the suppliers and found nothing. I will call Tom Hansen tomorrow to see if he can obtain the part.

Daryl
'64 230 SL
Serial # 508

[dwilli3038]

I just talked to Tom at Calaper motors. Hesaid the circular bracket attaches directly to the chassis. And that the other bracket was only for the older style pump.

Daryl
'64 230 SL
Serial # 508

[George Des]

Daryl--there is no doubt that you can attach the circular plate directly to the chassis--in fact when my original pump was replaced, the shop did it that way. I have since gone back to using a rebuilt old style pump with the original mounting brackets and shield for the sake of originality. If you look at the Haynes 113 chassis manual, though, you can see how they used the old style cross bracket with the circualr adapter plate to mount a newer style pump in the manner both Naj and I describe. I would submit that this is the MB factory intended way to do it even though any number of ways will probably work equally as well. Good luck.

George Des

[Naj ✝︎]

Daryl,
The mounting procedure I outlined is from the earlier BBB which covers the 230sl.
With that you will find that the new pump hangs just below the bottom of the tank, same as the old pump mounting height. (I believe both these pumps are not very strong at sucking fuel out of the tank and mounting height may be quite important!)

naj

65 230SL
68 280SL

[George Davis]

Just seconding or thirding Naj and George Des, I think you guys have covered it, but I'll just throw this in from the BBB for the 280 SL, section 07/11 C., page 07/11-4:

"C. Supplementary installation of fuel pump (small design)

A fastening plate with various holes for the individual vehicle models has been designed for mounting the fuel pump (small design)."

It goes on to give installation directions for replacement of the fuel pump (large design) with a fuel pump (small design).  In particular, it says the original mounting bracket remains screwed to the frame floor.  The circular fastening plate bolts to the original mounting bracket.  As Naj says, the square holes are used for the W 113s.  The gap in the circular fastening plate accomodates the fuel pump output line, and is oriented to the rear.

My car was built after the change to the small pump, and it is mounted as described above.

George Davis
'69 280 SL Euro manual

[dwilli3038]

If anyoine has an old style bracket please contact me.  According to Tom, that part is no longer available. Otherwise I will have to try to fab one myself. Any other Mercedes have a similar part I could adapt?

Daryl
'64 230 SL
Serial # 508

[George Des]

Daryl,

You may be able to get a used one off a junker if you can find one out there. I recall cutting an old style pump off a 250SE and I believe it had the same style cross bracket--I did not need the bracket so I simply extracted the pump by cutting the damping rubbers so I do not have an extra one lying around. If you can't find used and have to go with a new one, I know SLS--the website I cited--does carry them for about 35 euros. I've ordered other hard to find parts through them and they deliver fairly promptly and will take a credit card. Good luck--George Des

[rwmastel]

Maybe you can search eBay for used W113 parts and contact the sellers to see if they have one on a parts car.  Might work?

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