Author Topic: Dodgy fuel pump  (Read 3531 times)

Tabbycat

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Dodgy fuel pump
« on: July 07, 2011, 18:09:43 »
Gentlemen,  the long-type fuel pump on my 65 SL113 restoration is knackered. 

This car has been locked away in a Yorkshire garage for decades.

On removal of the pump from the car and scraping out the brown crispy bits (is this normal?) that had developed from the propeller-end, I managed to get the motor to turn. However, there was not much, if anything, in the way of actual pumping happening. The seals, however, seemed ok.

Removal of the top of the motor-end revealed heaps of fine soot. I trust that this is not normal. I shook most of this out onto the kitchen floor and my young nephews managed a remarkable job in evenly distributing this across the couches, carpets, curtains and cat in my house. "Has the motor burnt out?" I asked myself - "Why did it spin then, eh?"

I found out much later, and after much pain, that there was (now) nothing joining the notch in the brass fan to the motor shaft. Did I lose this when I opened the propeller-end? Was it ever in there in the first place? Who knows? There are more things between Heaven and Earth..., etc. Anyway, this is not the appropriate forum for regret and recrimination- I get plenty of that at home.

I then fashioned a tiny peg to lock the fan to motor shaft thingy from a dodgy bit of old plastic in a vain attempt to establish whether this was cause of my woes - I had planned to get something a bit more appropriate in due course, but just wanted to test the principle of the thing.

Result: the motor now refuses to spin.  Un-flippin'-believable. Should I have left the sooty stuff in the motor-end bit? That's makes no sense, but I do fear I may have dislodged something when I opened up the motor-end. Whatever I have done seems to have shuffled the pump off its mortal coil apologies, couldn't resist).


Anyway, there is a point to my ramblings:

(1)  Where's a good place to get the pump refurbished? I still live in vain hope that it is salvagable - am keen on keeping the bits original, if possible.
(2)  Should I be bothered about point (1)? How realistic is it to achieve things "as they were, where they were", in practice?
(3)  Where can I get any suitable pump from that will work until I can get this one refurbished.

and

(4)  Should I just go out and get a replacement one from an official Mercedes source now and just move on with my life?


Many thanks,


Tabby


Naj ✝︎

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Re: Dodgy fuel pump
« Reply #1 on: July 07, 2011, 19:51:42 »
Hi, Tabby,

There are instructions in the tech manual on how to refurbish this pump.
The soot is carbon dust from the motor brushes
You will need to find the little peg that drives the propeller.

Naj
68 280SL

JamesL

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Re: Dodgy fuel pump
« Reply #2 on: July 07, 2011, 20:41:10 »
If you are not up to the job yourself, track down Tower Bridge Diesels. Seem to come well recommended although not used them myself
James L
Oct69 RHD 280 in DB906 with cognac leather

rogerh113

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Re: Dodgy fuel pump
« Reply #3 on: July 08, 2011, 13:19:42 »
Hello,

I had a similar problem with my '66 fuel pump, and ended up getting a rebuilt long body from Star Motors in Endicott NY (USA).  Web page is www.300sel.com.  This was back in 2007.  The fuel pump looked great when I got it, and has been working fine since.   If you can't find a local source, then they may work out for you.

Regards -- Roger
1966 230SL black 4 speed (250 low compression engine)

George Des

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Re: Dodgy fuel pump
« Reply #4 on: July 08, 2011, 15:08:58 »
As Naj said, these things can be rebuilt if you have some mecahnical abilities following the instructions in the Tech Manual and provided they are not too far gone. I've worked on dozens of these and very few were beyond repair. The soot is the carbon residue from the contact brushes and is normal. What usually causes failure is when the main seal starts to leak and allow gasoline into the motor section. The combination of fuel and carbon dust tends to clog up the motor section evntually burning out the windings. In addition, dirty fuel and long periods of idleness tends to turn the fuel to a thick varnish that "glues" the vane to the pump bottom plate.
Hope this helps.

George

Tabbycat

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Re: Dodgy fuel pump
« Reply #5 on: July 08, 2011, 19:29:37 »
Thank you guys so much for your replies - the information has been really useful.  I think that I am inclined to get hold of a replacement pump for now to get going-Naj has kindly offered me info on a good place to get hold of one. 

I will keep hold of the one I already have and try to get it refurbished from one of the recommended sources in due time.

Thanks again,


Tabby