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  #1  
Old 03-07-2019, 07:36 AM
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Fuel Pump Question

I need to know if while the engine is running the fuel pump alternates on and off or if it stays continues on until the engine is turned off.
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Old 03-07-2019, 08:10 AM
Shadetree
 
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If the engine is turning an om617 MB diesel injector pump is suppose to be pumping fuel.
BTW, on other cars with other engines it might vary.
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Old 03-07-2019, 08:50 AM
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I was not precise: I am talking about electric fuel pump.
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Old 03-07-2019, 09:17 AM
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Typically speaking, an electric fuel pump runs as long as the engine is running. Some of the newer cars use a PWM "duty cycle" to control the speed of the pump, but it will always be running.
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Old 03-07-2019, 10:55 AM
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What car are you working on?
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Old 03-07-2019, 03:04 PM
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In use in 1999 Ford F250 7.3 Diesel
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