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Old 04-01-2001, 10:08 PM
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Location: Falls Church, VA
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On Saturday morning, put a new filter and gasket on the fuel pump, which I thought would stop the gas leak. Wrong - went ahead anyway trying to start. Got it to start and run for a second or two. Believe it died for lack of fuel as pump was really leaking into pan on floor. Good news is that engine sounded good when turning over and running, however briefly. Will replace pump and try again.

Question -

I disabled the secondary ballast resistor. With the primary only, I got 7.5 volts with the ignition on, but it dropped steadily, like after a minute it was down to 7.2 volts. The resistor heated up as the voltage dropped. Should I replace the resistor?

Chuck

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Old 04-01-2001, 10:33 PM
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Replace it? No. With the car not running, you're taking down the battery. You would probably see a 1/10 volt drop there based on basic discharge.

BTW, The ignition switch & neutral safety switch wiring should be bypassing 1 resistor during car starting already.

Also, you can always rig up a gas can to gravity feed your carbs and bypass the fuel pump entirely. Be sure not to incinerate yourself or the car or the garage in the process.

-CTH
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Old 04-01-2001, 11:09 PM
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U da man CTH!

I checked the voltage with the ignition on, not at starting. On starting, I am getting 11+ volts.

Believe me, I thought about rigging up a gravity feed and keeping up the effort, but then the thought of explaining to Senior Management how I just happened the garage down stopped me in my tracks.

So instead I stopped, put the tools away (this was about 4 PM), and went for a great run with my 15-year old son, which is a pretty rare event these days.

Our local dealer (American Service Center) has a pump in stock, so I will pick up the effort in a couple of days. The price difference between a Mercedes part with the MB club discount and aftermarket does not seem to be enough to justify shopping and shipping charges.

FYI - there is a small vent on the bottom side of the pump, which I believe is the source of the leak. I suspect that the diaphragm went south after sitting for 12+ years.

Stay tuned.

Chuck

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Old 04-02-2001, 08:30 AM
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There's a note in the 108 service manual about one kind of pump (out of two) being rebuildable. I never did bother to try.

Yup, fuel out of those holes means bye-bye diaphram.

Besides, time with the kid is always well spent. If the car's been sitting 12 years, it can wait a little longer.

-CTH
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Old 04-02-2001, 12:37 PM
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I am amazed that American Service Center had a fuel pump in stock. Mercedes has not used that style pump in thirty years. When I was in the area twenty years ago, ASC focused on the newer cars (read neglected the older car customers). I find that having UPS deliver the part is far easier and more covenant than going through dealer roulette (now I have it, now I don't). You have made great progress .... I hope your luck (skill) continues.
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190SL, 230SL 5-speed, 95 E320 Wagon, 01 E320 Wagon, MGB, Boxster 'S', 190SL "Barn Find"
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Old 04-02-2001, 12:55 PM
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I am amazed that American Service Center had a fuel pump in stock. Mercedes has not used that style pump in thirty years. When I was in the area twenty years ago, ASC focused on the newer cars (read neglected the older car customers). I find that having UPS deliver the part is far easier and more covenant than going through dealer roulette (now I have it, now I don't). You have made great progress .... I hope your luck (skill) continues.

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Jim Villers
190SL, 230SL 5-speed, 95 E320 Wagon, 01 E320 Wagon, MGB, Boxster 'S', 190SL "Barn Find"
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