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mtrei

USA
3739 Posts

Posted - 01/17/2016 :  18:43:51  Show Profile  Visit mtrei's Homepage  Reply with Quote
quote:
Originally posted by joeuserus

[I do still want to know what's been changed on the car though.



Post some more pictures, and I'm sure the originality police will chime in.
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joeuserus

Canada
32 Posts

Posted - 07/10/2017 :  16:23:05  Show Profile  Reply with Quote
Is there no coolant overflow tank on these cars?? The line from the rad cap just runs down beside the air filter box with nothing attached to it. Is there a tank underneath the fender panel??

Trying to google a part but nothing is coming up.
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GeraldK

Canada
88 Posts

Posted - 07/10/2017 :  17:10:02  Show Profile  Reply with Quote
There is no overflow tank. Hose running down the side is normal.

Gerald
1969 300 SEL 6.3 #0795
1959 190 SL
Calgary, AB
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joeuserus

Canada
32 Posts

Posted - 07/10/2017 :  17:19:52  Show Profile  Reply with Quote
Thanks.
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joeuserus

Canada
32 Posts

Posted - 07/17/2017 :  22:23:08  Show Profile  Reply with Quote
How loud is the fuel pump normally??

Should it prime when you turn the key over to the second position??

Is there a relay for the pump?? If it's not working does it usually end up being the pump itself??

I've got spark but wont fire up. Can't hear the pump from inside the car. Fuse is good.
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AgSilver

USA
207 Posts

Posted - 07/17/2017 :  23:39:20  Show Profile  Visit AgSilver's Homepage  Reply with Quote
quote:
Originally posted by joeuserus

How loud is the fuel pump normally??

Should it prime when you turn the key over to the second position??

Is there a relay for the pump?? If it's not working does it usually end up being the pump itself??

I've got spark but wont fire up. Can't hear the pump from inside the car. Fuse is good.



You should definitely hear the pump from outside the auto listening at the left rear wheel. Yes there is a relay, but the pump usually fails before the relay.

Palm Beach Gardens, FL
Niederheimbach, Germany
300SEL 6.3
E55K AMG
CLK63 AMG Gone
Ferrari 400GTC4 Gone
ML400CDI BiTurbo
ML350 CDI BT
9146GT
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GeraldK

Canada
88 Posts

Posted - 07/18/2017 :  00:05:11  Show Profile  Reply with Quote
I'm only familiar with the early long body pump, I'm not sure if you would have the same or the later short body pump. I don't think you can hear the pumps from inside the car but can definitely hear it from the outside next to left rear wheel.

The pump should turn on with the ignition in the second position. I'm not sure if there is a relay or not. I'm sure one of our other members are more familiar with this and will provide an answer.

I believe a common problem with a car that has been sitting for a long time is the impeller of the pump gets varnished up and seizes. I had this same issue on my pump. Usually fairly easy to fix.

If you can't hear the pump I would do a quick voltage check at the pump to make sure it's not a wiring issue before attempting to open up the pump.



Gerald
1969 300 SEL 6.3 #0795
1959 190 SL
Calgary, AB
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joeuserus

Canada
32 Posts

Posted - 07/25/2017 :  15:21:48  Show Profile  Reply with Quote
Finally had a second person to help, can't hear the pump turn on at all while under the car, even while cranking.

It has 10 volts on the multi-meter with the key in the second position then drops to 6 volts while cranking.

Is the fuel tank going to empty when I tank the fuel pump off??

Is there a rebuild kit out there for it?

1970 300SEL 6.3
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joeuserus

Canada
32 Posts

Posted - 07/25/2017 :  15:38:20  Show Profile  Reply with Quote
I think I have the newer small style pump but not 100% sure. Is there an easy way to tell them apart?

1970 300SEL 6.3
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GeraldK

Canada
88 Posts

Posted - 07/25/2017 :  15:55:45  Show Profile  Reply with Quote
It's possible that the impeller could just be stuck. I may recall some people recommending hitting the pump with a rubber hammer and it could loosen it up. I'd wait for someone else to confirm this before trying.

The tank will drain if you remove the pump. You just have to clamp off the feed hose to the pump.

Do you know which version (long or short body) pump you have?

I used the following instructions for rebuilding the long body pump. If you have this pump pay careful attention to part about the woodruff key.
https://www.sl113.org/wiki/Fuel/FuelPumpRebuildEarly

Another item to make note of is that those instructions mention 2 different o-ring sizes to seal the bellows to the shaft. I used the smaller size and I don't believe the bellows seals very well with it. After I completed my rebuild I came across an old thread on this forum where I believe Art Love mentions that you really need to use the larger o-ring. I also found that the o-ring sizes referenced for the outlet housings to be too thin. My pump leaked and I went up to the next thicker size.

There is no rebuild kit available for the long pump, however all the parts mention on that site are readily available.

They also have instructions for the rebuilding the short body pump.
https://www.sl113.org/wiki/Fuel/FuelPumpRebuildLater

I'm aware of this rebuild kit for the short pump.
https://mercedessource.com/store/1963-1973-short-bosch-mfi-electrical-fuel-pump-complete-resealing-kit-w-extras

Gerald
1969 300 SEL 6.3 #0795
1959 190 SL
Calgary, AB
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AgSilver

USA
207 Posts

Posted - 07/29/2017 :  14:31:25  Show Profile  Visit AgSilver's Homepage  Reply with Quote
If you desire peace-of-mind, and know you will always get home, put the Bosch pump in a box and install a modern, reliable gear-rotor pump.

Palm Beach Gardens, FL
Niederheimbach, Germany
300SEL 6.3
E55K AMG
CLK63 AMG Gone
Ferrari 400GTC4 Gone
ML400CDI BiTurbo
ML350 CDI BT
9146GT
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joeuserus

Canada
32 Posts

Posted - 07/30/2017 :  13:05:40  Show Profile  Reply with Quote
Not sure how I feel about jumping through the hoops of finding the right pump, bracket, psi/regulator, fittings of an aftermarket pump.

1970 300SEL 6.3

Edited by - joeuserus on 07/30/2017 13:09:08
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AgSilver

USA
207 Posts

Posted - 07/31/2017 :  01:22:41  Show Profile  Visit AgSilver's Homepage  Reply with Quote
I have an older version of this Mallory pump. This pump incorporates an adjustable pressure regulator and an external bypass. Connect a tee to the pump bypass; connect the MFI pump return to one side of the tee and the return line to the fuel tank to the other side; connect the inlet and outlet line accordingly and know your fuel pump problems are over. The Mallory mounting bracket magically aligns with the original fuel pump mounting points. Easy installation and a complete rebuild kit (which you may never need) includes brushes, bearing, seal, screen and gasket is $50.

[URL=http://s1213.photobucket.com/user/Ag171717/media/MSD%20Pump%2029269_v1_zpsaroagcyc.jpg.html][/URL]

[URL=http://s1213.photobucket.com/user/Ag171717/media/W109%20MSD%20Fuel%20Pump%20A_zps1z8juwbn.jpg.html][/URL]

[URL=http://s1213.photobucket.com/user/Ag171717/media/DSC_0117A_zpskpmnnlnb.jpg.html][/URL]

[URL=http://s1213.photobucket.com/user/Ag171717/media/DSC_0112A_zpsjlf6xauq.jpg.html][/URL]



Palm Beach Gardens, FL
Niederheimbach, Germany
300SEL 6.3
E55K AMG
CLK63 AMG Gone
Ferrari 400GTC4 Gone
ML400CDI BiTurbo
ML350 CDI BT
9146GT

Edited by - AgSilver on 07/31/2017 01:33:00
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joeuserus

Canada
32 Posts

Posted - 07/31/2017 :  12:48:34  Show Profile  Reply with Quote
Thx for the info and pics. I think I'll try a rebuild first and keep the pump as a possibility.

1970 300SEL 6.3
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joeuserus

Canada
32 Posts

Posted - 08/14/2017 :  16:05:39  Show Profile  Reply with Quote
Pulled the old pump off. Been worked on before. One of the studs holding the lower plate on is broken. Sprayed it up with penetrating fluid for now.


Does anyone know what colour wire is power/ground for the pump??


Who do you talk to to get access to the members section??

1970 300SEL 6.3
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