2003 dodge ram 1500 fuel pump problems

I have an '03 Ram 1500 5.9L. About 2 months ago, the truck died on me, no fuel pump. So, I replaced the pump... Nothing. Checked all fuses and relays... All Good. Disconnected plugs to check voltage at the plugs... All Good. Put the plugs back together and the truck started and has ran great since. The old pump was not dead and still works (just sits on the shelf as a spare).

The other day the truck died on me again, fuel pump. Looked like it was turning into the same issue so I disconnected the plugs, tested voltage (12.3V at pump), cleaned them, and applied a little di-electric grease and plugged them back in, checked fuses & relays... Nothing. Checked the ground on the fuel pump plug... 10.3 Ohms. I then disconnected the ground, spliced in new ground wire and grounded to the frame... 0 Ohms. Still nothing.

I disconnected all plugs from the fuse box and removed the entire box to check for corrosion... All good, no corrosion.

Still have no clue as to what is causing problems so I replaced the plug at the pump with a new OEM plug, reads 12.3V and 0 Ohms. Plug it back in and nothing. I then plugged in the old pump knowing it is good... nothing.

So in a last ditch effort to test the pump, I connected a wire from the power side of the plug direct to the + on the battery... IT WORKS AND THE ENGINE FIRED RIGHT UP.

For what it's worth, both times the pump started acting up, it was raining.

It's probably totaly unrelated, but the wiper motor stopped working at the same time. I have 12.1V and .01 Ohms at the plug.

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Precision Fuel Pump Module Assembly

Part #:A30059Line:PFPPrecision Fuel Pump Module Assembly

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Fuel Pump Module Assembly   With 26 Gallon Tank

Electric Or Mechanical:   Electric

Flow Rate (GPH):   20 GPH

In-Tank Or External:   In-Tank

Number Of Terminals:   4

Terminal Gender:   Male

Terminal Type:   Blade

Voltage (V):   12 Volt

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Precision Fuel Pump Module Assembly

Part #:A30150Line:PFPPrecision Fuel Pump Module Assembly

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Multiple Applications

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Electric Or Mechanical:   Electric

Flow Rate (GPH):   20 GPH

Number Of Ports:   1

In-Tank Or External:   In-Tank

Number Of Terminals:   4

Terminal Gender:   Male

Terminal Type:   Blade

Voltage (V):   12 Volt

Outlet Diameter (in):   3/8 Inch

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Precision Fuel Pump Module Assembly

Part #:A30172Line:PFPPrecision Fuel Pump Module Assembly

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Multiple Applications

View All Applications

Electric Or Mechanical:   Electric

Flow Rate (GPH):   33 GPH

Number Of Ports:   1

In-Tank Or External:   In-Tank

Number Of Terminals:   4

Terminal Gender:   Male

Terminal Type:   Blade

Voltage (V):   12 Volt

Outlet Diameter (in):   3/8 Inch

Located inside your fuel tank, a fuel pump has a small electric motor to make sure that pressurized gasoline flows to the engine to power the vehicle. Along the way, the fuel passes through a filter, either inside the fuel tank or externally in the fuel flow line. Most fuel pumps will last for the life of the vehicle but occasionally they can fail. Signs of such failure are a car that won’t start or stalls once it has started. Other times, the fuel flow can slowly become starved causing the check engine light to come on. Or if you hear a whirring sound coming from your fuel tank, the fuel pump may be about to fail, since fuel pumps do not normally make noise. A mechanic will need to get to the failed pump through the top of the fuel tank via an access panel in the passenger compartment or by removing the tank from the vehicle. This moderately complicated job is best performed at your dealership’s service department.

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