W108 Pump Discrepancy - Mercedes-Benz Forum

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post #1 of 13 (permalink) Old 07-04-2013, 10:41 AM Thread Starter
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Red face W108 Pump Discrepancy

I have a '70 280S and needed to change the fuel pump. The new replacement unit from Meyle has a plunger instead of an actuating arm. The flange on the motor requires that the pump be mounted in a vertical orientation but the plunger rod from the motor does not allow the plunger rod on the new pump to actuate. Does one need to remove the flange and mount the pump in a horizontal position? This would make sense, but I don't know if it's the correct method. The original p/n 001 091 49 01 is NLA and EPC calls out the replacement unit as a p/n 115 090 01 50. I went with the Meyle simply because it looked better made than the alternative and I knew if I bought a Meyle, then there was no way I would end up with a Uro part. Can anyone who may have experienced this same scenario lend some guidance and wisdom to my dilemna? Thank You
david


1973 Mercedes 450SLC (PineGreen/MahoganyLeather)
1981 Mercedes 380SL FORSALE (LtIvory/PalominoMBTex)
1984 Mercedes 500SEC Euro (040Black/BlackLeather)
1992 Mercedes 300SL-24 Signal Red/Black Leather
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post #2 of 13 (permalink) Old 07-04-2013, 10:50 AM
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Originally Posted by NorCalSL View Post
I have a '70 280S and needed to change the fuel pump. The new replacement unit from Meyle has a plunger instead of an actuating arm. The flange on the motor requires that the pump be mounted in a vertical orientation but the plunger rod from the motor does not allow the plunger rod on the new pump to actuate. Does one need to remove the flange and mount the pump in a horizontal position? This would make sense, but I don't know if it's the correct method. The original p/n 001 091 49 01 is NLA and EPC calls out the replacement unit as a p/n 115 090 01 50. I went with the Meyle simply because it looked better made than the alternative and I knew if I bought a Meyle, then there was no way I would end up with a Uro part. Can anyone who may have experienced this same scenario lend some guidance and wisdom to my dilemna? Thank You
david
Any chance of the photo of the situation?

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post #3 of 13 (permalink) Old 07-04-2013, 01:04 PM Thread Starter
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Moron Fuel Pump

Here are a couple of pics to help clarify the situation. The EPC drawing shows the original set up and the pic shows the Meyle unit that replaced it.

I can't seem to figure out to save/post an EPC pic
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1973 Mercedes 450SLC (PineGreen/MahoganyLeather)
1981 Mercedes 380SL FORSALE (LtIvory/PalominoMBTex)
1984 Mercedes 500SEC Euro (040Black/BlackLeather)
1992 Mercedes 300SL-24 Signal Red/Black Leather
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post #4 of 13 (permalink) Old 07-04-2013, 01:55 PM
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Originally Posted by NorCalSL View Post
I have a '70 280S and needed to change the fuel pump. The new replacement unit from Meyle has a plunger instead of an actuating arm. The flange on the motor requires that the pump be mounted in a vertical orientation but the plunger rod from the motor does not allow the plunger rod on the new pump to actuate. Does one need to remove the flange and mount the pump in a horizontal position? This would make sense, but I don't know if it's the correct method. The original p/n 001 091 49 01 is NLA and EPC calls out the replacement unit as a p/n 115 090 01 50. I went with the Meyle simply because it looked better made than the alternative and I knew if I bought a Meyle, then there was no way I would end up with a Uro part. Can anyone who may have experienced this same scenario lend some guidance and wisdom to my dilemna? Thank You
david
Remove and discard the wedge shaped metal piece that separated your old pump from the block, then attach the new pump directly to the block. Easy as pie.

"If spending money you don't have is the height of stupidity, borrowing money to give it away is the height of insanity." -- anon
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post #5 of 13 (permalink) Old 07-08-2013, 10:32 AM Thread Starter
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Remove and discard the wedge shaped metal piece that separated your old pump from the block, then attach the new pump directly to the block. Easy as pie.
It sure looked easy as pie but turned out to be a real PITA. I did exactly this and have zero fuel at the carb. I've installed it and uninstalled it 3 times. I primed the carbs, nothing, well, it ran 'till the fuel burned, I even took the top off the new pump and filled it with gas as welll as adding 2 more gallons to the tank which I knew already had fuel. I now have a new fuel pump and a non-running car to show for it. Any other ideas?
dws


1973 Mercedes 450SLC (PineGreen/MahoganyLeather)
1981 Mercedes 380SL FORSALE (LtIvory/PalominoMBTex)
1984 Mercedes 500SEC Euro (040Black/BlackLeather)
1992 Mercedes 300SL-24 Signal Red/Black Leather
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post #6 of 13 (permalink) Old 07-08-2013, 10:38 AM
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Are you certain the new pump works? Did you use the spacer that is supposed to come with the pump?

"If spending money you don't have is the height of stupidity, borrowing money to give it away is the height of insanity." -- anon
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post #7 of 13 (permalink) Old 07-08-2013, 12:06 PM
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You don't have the lines reversed by any chance?
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post #8 of 13 (permalink) Old 07-08-2013, 05:27 PM
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the pump on the picture has been around for more then 30 years , you use it with the spacer / o rings . why where you replacing the pump ????. the pump runs from a cam that is on the oil pump , remove the fuel pump again , and look with a mirror to see that cam while cranking . also with pump in your hands , push and let go on plunger , pump will make a noise , and if you put your finger on the suction line you should feel a strong vacuum , and pressure on other line .
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post #9 of 13 (permalink) Old 07-08-2013, 05:42 PM
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if you had a suction gun , you could connect it to the line from gas tank , and suck .if it is ok there , you will get plenty of fuel .if it is not , you will get air . a suction gun is handy to do a brake fluid / power sterring partial change , also at rear axle .
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post #10 of 13 (permalink) Old 07-09-2013, 08:23 AM
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try this , pour some gas in carbs to start engine , now see if you have oil pressure , i ll bet you dont , if that is the case , dont run the engine anymore , you have a broken oil pump shaft .the fuel pump runs out of the oil pump .
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