Question about 2003 Chevrolet Avalanche

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How do you know if your fuel pump is bad or damaged?

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  • afalkquay Oct 05, 2009

    I pushed the tire type fitting and nothing came out? no gas or air?

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  • Chevrolet Master
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There is a tire valve type fitting on the fuel sourse hose going into the injectors. A fuel pump pressure guage can be connected to this fitting and it will give you the amount of fuel pressure your pump is producing. The reading should be at 35-70lbs for a good pump. Thank you, Dana.

Posted on Oct 05, 2009

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  • Chevrolet Master
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There are just a few things to look for, 1st the vehicle won't start, the next is the pump makes a very loud whinning noise, the last is a severe loose of power, although this can be caused by a plugged fuel filter.

Posted on Oct 05, 2009

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99 geo metro 1.0 liter ,no power at fuel pump. Is relay problem


can be fuse /relay broken damaged corroded wire /connection

Jul 11, 2016 | Geo Metro Cars & Trucks

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My nissan armada is stalling and spitting and sputtering


1) spark plugs
2) Ignition coils
3) Low fuel pressure, bad Fuel filter (it's inside fuel tank with Fuel pump)
4) Low Fuel pressure, damaged fuel pump (inside fuel pump)
5) check for Fuel Pump Relay on PDMI. There are several issues with that relay. You can swap with fog light relay (its located also on PDMI) to check for damage.

Jun 13, 2014 | Nissan Armada Cars & Trucks

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Why is my nissan armada is stalling and spitting and sputtering


1) spark plugs
2) Ignition coils
3) Low fuel pressure, bad Fuel filter (it's inside fuel tank with Fuel pump)
4) Low Fuel pressure, damaged fuel pump (inside fuel pump)
5) check for Fuel Pump Relay on PDMI. There are several issues with that relay. You can swap with fog light relay (its located also on PDMI) to check for damage.

Jun 13, 2014 | Nissan Armada Cars & Trucks

1 Answer

95 f350 7.3 turbo deisel,truck is getting fuel wont start


I agree, please stop using the starting fluid. I don't know what you know or don't know but that engine has an intake heater and glow-plugs. Unless you disconnect those two circuits first, you could cause an explosion and damage the engine. The 7.3L is a good engine but there are a few things that can fail and not allow the engine to start but crank. I'm going to list parts to check: oil oil or oil that needs to be changed, blown fuses, over heated relays, fuel filter, fuel pump, damaged wiring to fuel pump, ICP censor, injection pump, IPR sensor, multiple worn out or damaged fuel injectors, damaged injector control module. You wrote that the engine is getting fuel. How do you know that. Please tell me what the fuel pressure is. Please write back if you have more questions and be as specific as you can. I don't know how far you want to go and what tools you have and what test you can run. Hope to hear from you soon, good luck.

Mar 03, 2014 | Ford Cars & Trucks

1 Answer

What are the sign's of your fuel pump going bad?


The most obvious bad fuel pump symptoms is your vehicle won't start, or it starts but does not run for very long before eventually stalling out. Your vehicle will act as though it is out of gas, even though the fuel tank is full. As the fuel pump attempts to feed the engine fuel, your vehicle may make bucking noises but will not spark up.
If you do suspect that you have symptoms of a bad fuel pump, you can listen to it to see if it is operating. Electric fuel pumps can be heard when you turn the ignition to the second position, so if you do not hear any sound coming from your fuel tank with the key turned, your fuel pump may have failed or the motor may have burnt out. Also, if you notice that the fuel pump is making an excessive whining noise, it may be a sign that the part is on the verge of failing.
Two common bad fuel pump symptoms that your vehicle may experience are engine misfire at higher speeds, or difficulty climbing hills. These symptoms are a sign that your engine is not getting enough fuel. If you are experiencing these symptoms, you may want to perform a fuel pump pressure test.
In order to perform a fuel pump pressure test, you will require a fuel pressure gauge. By inserting the gauge in the Schrader valve (usually located in the engine compartment), you will be able to determine if your engine is receiving adequate pressure of fuel from the vehicle's tank. The required pressure reading will be different for vehicle specific applications. Most repair garages have one of these gauges on hand to perform this test.
Your fuel pump may fail or become a faulty fuel pump for a number of reasons. Rust, debris and dirt may enter into the vehicle's fuel system, and may potentially be clogging the fuel filter or the fuel strainer. This does not allow enough fuel to pass through to the fuel pump which overheats the parts, causing damage. A second cause of fuel pump failure is damage to internal parts caused by small particles of dirt entering into the fuel pump. The fuel strainer and fuel filter were unable to keep these particles from entering into the fuel. Another major cause of a faulty fuel pump or failure is letting your gas level get too low. When the level of fuel is low, the fuel pump has to work much harder, becomes overworked, does not cool down properly, and as a result can be damaged. You should never let your fuel reach less than a quarter of a tank.

Sep 12, 2013 | 1995 Lincoln Town Car

1 Answer

2001 chevy blazer replaced fuel pump with fuel pick up switch and fues guage still does not work


THERE SHOULD BE 3 WIRES, FROM PUMP/SENDER UNIT, 1 WIRE FOR PUMP POWER, 1 WIRE FOR GROUND, & 1 WIRE FOR FUEL GAGE, THE FUEL GAGE WIRE GOES DIRECTLY TO GAGE , INSPECT THIS WIRE , MAY CHANGE COLOR ON ITS WAY TO GAGE, WIRE MAY HAVE BEEN DAMAGED UNDER TRUCK, ALONG FRAME RAIL, OR HAS BECOME CORRODED, A BUMP IN THE WIRE INSULATION(CORROSION), ALSO, CHECK ALL GROUNDS, REPEAT, ALL GROUNDS TO FUEL PUMP CICUIT, EVEN IF THEY LOOK OK, THEY COULD BE BAD GROUNDS, YOU NEED GOOD GROUNDS TO COMPLETE ANY CIRCUIT !!! 2001 TRUCK, I'D QUESTION YOURS !!!!! WHAT SHAPE WAS YOUR WIRE HARNESS @ PUMP, THEY GO BAD, ANYTHING UNDER THE TRUCK !!!!!! STAY IN YOUCH, LIKE TO KNOW OUTCOME !

Mar 25, 2013 | 2001 Chevrolet Blazer

3 Answers

Truck will not start, has fire. relay ok. no trouble codes.


when you turn the key in 'on' position, do you hear the fuel pump hum? check under hood in black box,,fuses,,and relays. for bad fuse or fuel pump relay bad. try bumping fuel tank with something hard to see if fuel pump will engauge with key on. maybe bad pump. have you had off road? look for pulled plug from fuel pump underneath near gas tank.have you bent or damaged your igbition key somehow? the key sends a signal to your cars computer to engauge the pump and crankshaft sensor.but if you do have fire,,,it's a fuel problem, so you are on the right track. if nothing i've said helps, check for a bad fuel pressure regulator.hope this helps and thank you for choosing fixya.com!!

Nov 19, 2010 | 2001 Dodge Durango

2 Answers

Fuel pump problems


IF THE CAR START ON STARTER GAS THE PUMP IS BAD -OR THE ELETRIC CURCIT TO THE PUMP IS DAMAGED. TRIE FIRST BY PUTTONG STARTERGAS IN THE AIRBOX AND SEE IF ITS START AND DIES , THEN CHECK THE FUSE TO THE PUMP ,

Sep 26, 2010 | 1995 Chevrolet Lumina

2 Answers

Need to know how to replace a fuel pump


Here is what I looked up: Fuel Pump Removal & Installation To Remove:
  1. Remove the fuel tank.
  2. Disconnect the pressure transducer connector on the top rear comer of the fuel tank.
  3. Clean the area around the fuel pump mounting flange.
  4. Remove the bolts and remove the fuel pump.
CAUTION
The fuel pump must be handled carefully to avoid damage to the float arm and the filter.
Remove and discard the fuel pump mounting gasket.
To Install:
  1. Clean the fuel pump mounting flange and the fuel tank mounting surface.
  2. Install the fuel pump mounting gasket on the mounting flange.
  3. Position the fuel pump in the fuel tank. NOTE: Tighten fuel pump bolts in a star pattern.
  4. Install the bolts. Tighten to 10 Nm (89 in. lbs.).
  5. Connect the fuel pressure transducer.
  6. Install the fuel tank.
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Jul 05, 2010 | 2000 Mercury Grand Marquis

2 Answers

Gas leaks out of my gas tank recently had a fuel pump put on could that had caused the problem


Yes, it is a very good possibility that replacing the fuel pump did cause the fuel leak at the fuel tank, especially if the vehicle did not leak fuel from the fuel tank before the fuel pump was replaced, and the seal to the fuel sending unit/fuel pump assembly might have slipped out of place or was damaged when the fuel sending unit/fuel pump assembly was installed onto the fuel tank, the fuel lines might not be properly attached to the fuel sending unit/fuel pump assembly, the filler hose to the fuel tank might not be properly tightened, or even damage to a fuel line, the fuel tank itself, or a vent, from not properly installing the fuel tank into the vehicle. Those would all be a problem with quality workmanship and if any of those reasons are responsible for the fuel leak and the repairs were done at a repair facility then they should warranty the repair for their mistake at no additional cost to you.

However, road debris could also have damaged the vehicle and that would not be anything that would be covered by a warranty, and someone who is qualified and objective should inspect the vehicle to determine exactly where the fuel leak is coming from so that a proper course of action can be decided.

Jul 01, 2010 | 1998 Ford Mustang

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