Electric Fuel Pump Q - Mercedes-Benz Forum

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post #1 of 2 (permalink) Old 06-20-2010, 11:46 AM Thread Starter
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Electric Fuel Pump Q

I'm testing my electric fuel pump on my 72 4.5. I get fuel to the pump and it switches on with the key so the relay looks good. I'm not getting anything out of the pump. I just took off the outlet from the pump to the filter and gas poured from the opening. The outlet looks to have a spring loaded seat to restrict fuel flow. How does that work? Does the pump build enought pressure to open the valve? Can I replace it with an outlet that doesnt have the valve? Is my pump DOA?

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post #2 of 2 (permalink) Old 06-20-2010, 08:00 PM
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This thread has a lot of info on fuel pumps:


When you say you get no flow, where did you check it? Flow can be tested by removing hose from outlet of damper downstream of fuel pressure regulator and running it into a container - need to jumper relay so you can run pump for 30 sec and measure amount collected - 1l/30sec is the spec.

Otherwise, maybe remove pump and hook it up so as recirculate kerosene or some no flammable fluid through it.
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