Fuel pump - Mercedes-Benz Forum

 
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post #1 of 9 (permalink) Old 05-12-2013, 08:18 PM Thread Starter
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Fuel pump

Ok fuel pump is stuffed I need to blow out the fuel line. Where
is the best place under the bonnet to blow back through the line?

Bryan
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post #2 of 9 (permalink) Old 05-12-2013, 08:26 PM Thread Starter
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Bit of a glitch. should mention it is a w116 se 110 motor

also does anyone know where the black warm up relay is situated
Bryan
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post #3 of 9 (permalink) Old 05-13-2013, 09:08 AM
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what is the problem , [ stuffed ]????
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post #4 of 9 (permalink) Old 05-13-2013, 08:42 PM Thread Starter
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stuffed means the fuel pump is beyond help, caput, dead, no longer alive, passed on, extinct.... (Very much like Monty pythons parrot) So i am cleaning the lines and being fuel injected i am looking for the correct place to stick an air hose to blow back through the line. Before installing a new alive etc... pump

Bryan
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post #5 of 9 (permalink) Old 05-14-2013, 04:28 AM
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Have you given thought to taking off the old pump and degunkafying it?
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post #6 of 9 (permalink) Old 05-14-2013, 09:27 AM
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i dont see those cars anymore , but a 116 with a 110 engine is ????? , carb or cis it was called a 280s or se
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post #7 of 9 (permalink) Old 05-14-2013, 07:27 PM Thread Starter
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"you the man Mr G" Defunkgunked, twirled impela, hard wired and BINGO up and running
As a master or jargoneesee could you tell me where the thingamejig is that lets me blow out the watchamacallit??? as per #4.Thanks Mr A its a 280se D injection I had a VW (Hitlers revenge)now a Merc. Should i be concerned about my choices ?? Is there hope on the horizon?
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post #8 of 9 (permalink) Old 05-15-2013, 05:53 AM
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Well, blowing out the fuel system would be relatively easy, though I can say that without ever having done the job myself

In the front bay, look for the fuel supply line and unhook it from what I would imagine is a rubber hose somewhere (is yours a 6 or an 8 cylinder?) and attach your blower.

However, here's something to consider. Unless you intend to unhook the line going into the tank, you'll be blowing any gunk, crap or rust back into the tank, to regunkafy your pump at some future point. Have you instead thought about draining any old gas and putting the pickup tube into a glass jar with solvent, and letting your fuel pump do the job? You'd need to unhook the fuel delivery hose in the engine bay (and any return lines too)...

In 2009, I deployed and left my 108 with my dad, who used the car sporadically. In time (like by 2011, when I was returning), water collected in the tank and rusted the fuel pump solid. He took the thing off and sprayed a can of WD 40 into it, and let the thing sit for a few days. When he hooked it up to a power supply (backward), the thing ran in reverse and blew a buncha stuff out of the intake. Not having to pay $700 or so for a new pump was music to my ears, and when he put the thing back in, it worked like a charm.

Something to consider - a Ford or Chevy or VW or BMW fuel pump does the same thing as any Mercedes pump - it sends gas to an engine, using 12 volts. Some pumps are submersed in the tank, ours are external.

There's no reason why you can't use a different make's pump, or something from an aftermarket place, like Summit Racing. As long as you get something that delivers a minimum volume with a minimum pressure, you're golden (the numbers are somewhere in the "online resources" portion of the site). If you find something with a little higher pressure, that's no sweat too, as the regulators on the engine's fuel rail will keep the system at the right pressure.
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post #9 of 9 (permalink) Old 05-22-2013, 07:54 PM Thread Starter
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Everything is now running sweet so thanks to all for advice. I am now going on a pertronic system I dont trust the resistors and want to give rhe coil a bigger boost i will keep you posted.
Cheers Bryan
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