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Fuel Lift Pump Power Problems

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Old 06-15-2010, 09:05 PM
Keith P Keith P is offline
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Join Date: Jun 2010
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Default Fuel Lift Pump Power Problems

Am having issues maintaining power to my 2006 Ram 2500 Cummins lift pump. We can not find the fuse and/or relay switch to troubleshoot. Where is it located and what would cause the power to stop, then turn back on? We've only bumped to test it.
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Old 06-15-2010, 10:00 PM
Join Date: Aug 2006
Vehicle: 2001 Dodge Ram 3500 CTD
Location: Avondale az/morganton nc
Posts: 145

The fuel lift pump will only turn on for 30-60 seconds when you bump the key. The ecm controls the on and off time of the fuel life pump. If im not mistaken its pwm (pulse width modulated) so it never runs wide open all the time the ecm determines the duty cycle of the pump.
01 3500 4x4, edge comp,sbc clutch,stage 2 jammer nozzels,4 inch straight pipe,amsoil cai,aurura 3000,raptor fuel pump,autometer gauges
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Old 06-15-2010, 10:08 PM
Coal Train's Avatar
Coal Train Coal Train is offline
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Join Date: Dec 2008
Vehicle: 2006 Twin Turbo CTD, 742 HP/ 1456 TQ
Location: East Alabama
Posts: 863

When you initially turn the key on, the pump will cycle for 1.5 seconds.

If you bump the starter, the pump will cycle for 20 seconds.

How are you measuring or what is causing you to think you have a power loss?

Do you have a fuel pressure gauge that is showing no fuel pressure?

That thing gotta Hemi?...... I guess ya better bring two of 'em then!
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Old 06-15-2010, 11:42 PM
Keith P Keith P is offline
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Join Date: Jun 2010
Posts: 2

We had a fuel error and checked various fuses and connections with a standard test light to make sure everything was getting power...the lift pump was not. However, we did turned the ignition and did the bump and did experience as you suggested. However, we have since removed the fuel tank and are in the process of replacing the pump but are concerned there might be an electrical issue...based on what I see here, perhaps not?
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cummins, fuel, lift, power, pump

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