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How do I test for a faulty feul pump?

In the past, I bench tested a fuel pump that I new was faulty. It was a waste of time. The fuel pump ran up a storm on the bench not on the vehicle. With pump on the vehicle, I used a gage and checked fuel pressure, none. I checked for good voltage and ground at the pump, that was good and no pump action.
The pump in question, I cut it open, the little brushes were wore down to the nub. A new fuel pump fixed the problem on that vehicle.

Apr 30, 2018 | Cars & Trucks

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1991 Dodge Dakota fuel pump wireing. I removed pump and tested OK- Tried switching relays (all same in relay box) Still no cycling only a slight noise then silent. Ran 12-v (spiced) to left wire of 5.

engine cranking do you have spark at the plugs and fuel injector pulse? I don't know what testing you have done? I am trying to decide if more than one issue? Did you check voltage and ground at fuel pump connector, engine cranking? Initial prime is one thing but after that, if no rpm signal, no spark--no fuel injector pulse--no fuel pump. W/o rpm signal computer won't ground the asd relay. Any applicable trouble codes?
In my opinion, you can't bench test a fuel pump, I've seen faulty fuel pumps that would run up a storm on the bench but make no pressure when in the gas tank.
fuel pump dakota-sd44d5iihse5k0tgntjs1xio-1-0.jpg

May 09, 2017 | Dodge Cars & Trucks

1 Answer

Charging output is 14.5 volts at 3000 rpm but at idle it discharges the battery.

replace the voltage regulator
14.5 volts should be at 2000 rpms
It may be best to have the alternator bench tested by an accredited auto electrician as there could be a brush issue

Jan 23, 2016 | Cars & Trucks

1 Answer


have a load test done on the battery to check for bad cell. Have the alternator bench tested for diode and out put . Remove the earth wire and place an amp meter in the circuit to check what current is being drawn to indicate if bulbs or shorts.. Check that the boot light is turning off , glove box light is off, map reading light is off. interior light is off.

Jun 08, 2014 | 1990 Cadillac Deville

2 Answers

Is my starter bad? When trying to start I hear a single click. Voltmeter shows a drop from about 12V to 8-9V while turning. Starter motor gets really hot, load wires between battery and starter get so...

check to see if you can turn the engine over by hand it maybe siezed and not turn over.this can cause this type of starter problem and voltage drop.check all grounds from the battery to engine block and body under the hood,if you have a bad ground it can cause a similar type problem.

Nov 04, 2013 | Cars & Trucks

1 Answer

Washer fluid motor/pump not working

You need wiring diagrams when you work on your own vehicles

Dec 18, 2012 | Cars & Trucks

1 Answer

2002 Taurus bench tested fuel pump and motor works then connected to wire harnes it doesn't work, why?

Did you check the fuses or relays..If so check the inertia fuel shut off switch..The owners manual will show you where its located

Apr 30, 2012 | 2002 Ford Taurus

1 Answer

What shall i do ifintegrated circuit alternator is low charging?

REmove the unit and bench test it. There are many conditions that manifest as you describe...A dead cell in a battery would discharge overnight, then a porperly functioning charging system would show lower voltage on the gauge...

Bench test helps you not just parts replace.

Be sure that belts are tight, battery terminals cleaned and tightened...Be certain of ground from battery to the engine..

Aug 18, 2010 | 1983 Toyota Land Cruiser

1 Answer

Fuel pump clicks i have replaced the fuel pump/filter/relay

you need to be aware of the most important rule just because its new it does not mean its good . fuel pumps hum they dont click you need to remove it and bench test it its most likely stuck . i always bench test them before i install them . hope this helps .

Jul 31, 2010 | 2002 Pontiac Grand Am

1 Answer

93 volvo 940

Did you check your wiring, make a continuity test on the wiring,
clean all your ground wiring.

Jun 29, 2008 | 1993 Volvo 940

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