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Old 11-21-2016, 08:40 PM
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Join Date: Dec 2001
Posts: 577
Testing M103 Fuel Pump For Voltage At Pump W/O Helper

Use your cell phone's video function

1991 300-SEL M103 - Pierburg pump

12V test light - connect alligator clip to probe end of test light.
Connect alligator clip to fuel pump electrical connection that black wire attaches to. Connect red lead of test light to the fuel pump electrical connection that brown wire connects to.

Set cell phone to video record and point at business end of test light that contains bulb.

Turn key in ign. switch to first position; then crank. The cranking was not necessary, but test light continued to illuminate while cranking. Cranked 3X in video. All the times it lit up. Pump is getting voltage, but that does not prove it's functioning.

Will next test fuel tank for flow to pump and pump for flow to fuel filter; then fuel filter flow to front. Suspect pump. If it's fails test, will replace it and fuel filter.

Video is upside down - you still see the results. First crank about 30 secs. into video.

M103 Single Fuel Pump Test_zpsuvqydbbf.mp4 Video by lesterl | Photobucket

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Old 11-22-2016, 05:42 PM
Join Date: Mar 2016
Location: Los Angeles, CA
Posts: 1,984
Thanks for posting this - I'm sure that our members will find this useful. If you have any detailed, DIY write ups, check out this link. If we publish your article, we'll give you 10% off your next order.

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Old 04-07-2017, 06:52 PM
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Join Date: Jan 2006
Location: Tucson, AZ
Posts: 5,348
Alternatively you can use a 12V buzzer/horn. Don't use an automotive horn as they require too much power.

Much easier to find a helper. Doesn't take a scientist to turn a key.

“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
― Brian P. Cleary, You Oughta Know By Now
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