Question about 1996 Chevrolet K1500

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1998 chevy fuel pump problem, 2 different connectors, 1 is for the fuel pump and sending unit. I don't know what the other 3 wire connector is for. Please help. Thanks.

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  • Joey Johnson May 11, 2010

    THE OTHER 3 ARE FOR A DUEL TANK. DO YOU HAVE ONE OR TWO TANKS?

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The tank has a sender unit, a fuel pump unit, and a pressure sensor. go to the library, they should have all the books or mitchell online for free or you can go to mitchell1diy and for 10 bucks get all the info you need.

Posted on Apr 28, 2010

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Where is the fuel pump relay and how can e serviced?


Description

*: ECM determines the start signal status by the signals of engine speed and battery voltage.
The ECM activates the fuel pump for several seconds after the ignition switch is turned ON to improve engine start ability. If the ECM receives a engine speed signal from the camshaft position sensor (PHASE), it knows that the engine is rotating, and causes the pump to operate. If the engine speed signal is not received when the ignition switch is ON, the engine stalls. The ECM stops pump operation and prevents battery discharging, thereby improving safety. The ECM does not directly drive the fuel pump. It controls the ON/OFF fuel pump relay, which in turn controls the fuel pump.

Component Function Check
1.CHECK FUEL PUMP FUNCTION
1. Turn ignition switch ON.
2. Pinch fuel feed hose (2) with two fingers.
1 : Air cleaner assembly


Fuel pressure pulsation should be felt on the fuel feed hose for 1 second after ignition switch is turned ON.
Is the inspection result normal? YES >> INSPECTION END
NO >> EC-466, "Diagnosis Procedure".
Diagnosis Procedure
1.CHECK FUEL PUMP POWER SUPPLY CIRCUIT-I
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Turn ignition switch ON.
4. Check the voltage between ECM harness connector and ground.


Is the inspection result normal? YES >> GO TO 4.
NO >> GO TO 2.
2.CHECK FUEL PUMP POWER SUPPLY CIRCUIT-II
1. Turn ignition switch OFF.
2. Disconnect IDPDM E/R harness connector F10.
3. Check the continuity between IPDM E/R harness connector and ECM harness connector.

Is the inspection result normal? YES >> GO TO 3.
NO >> Repair open circuit or short to ground or short to power in harness or connectors.
3.CHECK CONDENSER-1 POWER SUPPLY CIRCUIT-I
1. Reconnect all harness connectors disconnected.
2. Disconnect condenser-1 harness connector.
3. Turn ignition switch ON.
4. Check the voltage between condenser-1 harness connector and ground.


Is the inspection result normal? YES >> GO TO 5.
NO >> GO TO 4.
4.CHECK 15A FUSE
1. Turn ignition switch OFF.
2. Disconnect 15A fuse (No. 32) from IPDM E/R.
3. Check 15A fuse.
Is the inspection result normal? YES >> GO TO 6.
NO >> Replace fuse.
5.CHECK CONDENSER-1 POWER SUPPLY CIRCUIT-II
1. Disconnect IPDM E/R harness connector E18.
2. Check the continuity between IPDM E/R harness connector and condenser-1 harness connector.

3. Also check harness for short to ground and short to power.
Is the inspection result normal? YES >> GO TO 13.
NO >> GO TO 7.
6.DETECT MALFUNCTIONING PART
Check the following.
??? Harness connectors E29, B10
??? IPDM E/R connector F10
??? Harness for open or short between IPDM E/R and condenser-I
>> Repair open circuit or short to power in harness or connectors.
7.CHECK CONDENSER GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect dropping resistor harness connector.
3. Check the continuity between condenser-I harness connector and ground.

4. Also check harness for short to ground and short to power.
Is the inspection result normal? YES >> GO TO 8.
NO >> Repair open circuit or short to power in harness or connectors.
8.CHECK CONDENSER-1
Refer to EC-469, "Component Inspection (Condenser-1)".
Is the inspection result normal? YES >> GO TO 9.
NO >> Replace condenser-1.
9.CHECK FUEL PUMP POWER SUPPLY CIRCUIT-III
1. Disconnect ???fuel level sensor unit and fuel pump??? harness connector.
2. Check the continuity between IPDM E/R harness connector and ???fuel level sensor unit and fuel pump??? and ground.

Is the inspection result normal? YES >> GO TO 11.
NO >> GO TO 10.
10.DETECT MALFUNCTIONING PART
Check the following.
??? Harness connector E29, B10
??? Harness for open or short between ???fuel level sensor unit and fuel pump??? and IPDM E/R
??? Harness for open or short between ???fuel level sensor unit and fuel pump??? and ground
>> Repair open circuit or short to power in harness or connectors.
11.CHECK FUEL PUMP GROUND CIRCUIT
1. Check the continuity between ???fuel level sensor unit and fuel pump??? and ground.

2. Also heck harness for short to power.
Is the inspection result normal? YES >> GO TO 12.
NO >> Repair open circuit or short to power in harness or connectors.
12.CHECK FUEL PUMP
Refer to EC-469, "Component Inspection (Fuel Pump)".
Is the inspection result normal? YES >> GO TO 13.
NO >> Replace fuel pump.
13.CHECK INTERMITTENT INCIDENT
Refer to GI-42, "Intermittent Incident".
Is the inspection result normal? YES >> Replace IPDM E/R.
NO >> Repair or replace harness or connectors.
Component Inspection (Fuel Pump)
1.CHECK FUEL PUMP
1. Turn ignition switch OFF.
2. Disconnect ???fuel level sensor unit and fuel pump??? harness connector.
3. Check resistance between ???fuel level sensor unit and fuel pump??? terminals as follows.


Is the inspection result normal? YES >> INSPECTION END
NO >> Replace ???fuel level sensor unit and fuel pump???.
Component Inspection (Condenser-1)
1.CHECK CONDENSER
1. Turn ignition switch OFF.
2. Disconnect condenser-1 harness connector.
3. Check resistance between condenser-1 terminals as follows.


Is the inspection result normal? YES >> INSPECTION END
NO >> Replace condenser-1.
Fuel injector Description The fuel injector is a small, precise solenoid valve. When the ECM supplies a ground to the fuel injector circuit, the coil in the fuel injector is energized. The energized coil pulls ...
Ignition signal Description The ignition signal from the ECM is sent to and amplified by the power transistor. The power transistor turns ON and OFF the ignition coil primary circuit. This ON/OFF operation induc ...
Other materials: Heater & cooling unit assembly
Removal and Installation COMPONENTS 1. Steering member 2. Heater and cooling unit 3. Blower unit REMOVAL 1. Discharge the refrigerant from the A/C system. Refer to HA-24, "HFC-134a (R-134a) Service Procedure". 2. Drain the engine coolant from the cooling system. Refer to CO-1 ...
On-vehicle repair
WHEEL HUB Removal and Installation 1. Knuckle 2. Baffle plate 3. Wheel hub assembly 4. Brake rotor 5. Wheel nut 6. Anchor block 7. ABS sensor 8. Parking brake cable A. Refer to PB-6, "PEDAL TYPE : Exploded View" (Pedal type), PB-7, "LEVER TYPE : Exploded View" (Leve ...
P0011, P0021 IVT control
DTC Logic DTC DETECTION LOGIC NOTE: If DTC P0011 or P0021 is displayed with DTC P0075 or P0081, first perform the trouble diagnosis for DTC P0075, P0081. Refer to EC-1191, "DTC Logic". DTC CONFIRMATION PROCEDURE 1.PRECONDITIONING If DTC Confirmation Procedure has been previousl ...

Mar 02, 2016 | Cars & Trucks

1 Answer

Why will my gas gage stay at full on my 2001 excursion


The gauge is faulty or the sending unit in the fuel tank is bad ! There is away to test it, find a wiring diagram an locate the two wires at the fuel pump sending unit connector . Go to radio shack or some other electronics store an buy some resistors of differing resistance , I'm not sure of resistor sizes , I will look it up on my ford service info system. If you jump the right resisters into the fuel sending unit circuit you can make the gauge show 1/4 - 1/2 - 3/4 an full. If it move to those positions with the right size resistors it's not the gauge but the sending unit in the gas tank ! Diagnosis of Stuck Fuel Gauge Is it Gauge or Sending Unit

May 06, 2015 | 2001 Ford Excursion

1 Answer

Replace fuel pump 1993 mazda 323



REMOVAL & INSTALLATION

323, Protege, 520-22 626 and MX-6 and 522-24 MX-3 Models
See Figures 1 and 2

  1. Relieve the fuel pressure and disconnect the negative battery cable.
  2. If not already removed, depress the clips on each end of the rear seat cushion and remove the cushion.



0900c152802612b0.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 1: Detach the fuel hoses and electrical connections from the fuel pump, then remove the attaching screws and the pump


0900c152802612b1.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 2: Exploded view of the fuel pump assembly for the 323, Protege, 520-22 626, MX-6 and 522-24 MX-3

  1. If not already done, detach the electrical connector from the fuel pump/sending unit.
  2. Remove the attaching screws from the fuel pump/sending unit access cover and remove the cover.
  3. Disconnect the fuel supply and return hoses from the fuel pump/sending unit.
  4. Remove the attaching screws and the fuel pump/sending unit from the fuel tank.
  5. Detach the sending unit electrical connector, remove the sending unit attaching nuts and remove the sending unit from the fuel pump assembly.

To install:
  1. Attach the sending unit to the fuel pump assembly and install the nuts. attach the sending unit electrical connector.
  2. Install the fuel pump/sending unit into the fuel tank with a new gasket and install the mounting screws.
  3. Connect the fuel supply and return lines.
  4. Install the access cover and the mounting screws.
  5. Attach the sending unit electrical connector.
  6. Position the rear seat cushion over the floor, making sure to align the retaining pins with the clips. Push down firmly until the two retaining pins are locked into the rear seat retaining clips.
  7. Connect the negative battery cable, start the engine and check for proper system operation and for fuel leaks.

May 08, 2012 | 1993 Mazda 323

2 Answers

1998 chevy 1500 pick up. good fuel pump, new fuel filter,fuel relay good. starts good, dies instantly. what to check next.


If your fuel system is all correct and working it needs to be an ignition problem-and the usual suspect is the crank sensor, which coincidently does not set a CEL-so, since it is very inexpensive (usually less than $50) and not difficult to change int a 350, take a chance there-you could try to remove the connector and clean off the connection first-worth a shot.

May 26, 2011 | Chevrolet 1500 Cars & Trucks

1 Answer

2000 s-10 4 cyl. truck runs good gas gadge gose from full to emty with a full tank or emty tank dose not matter? whats the fix!


had the same problem on my 2000 s-10 ,turned out the wire from sending unit had worked loose(bad crimp). The fuel pump had recently been replaced. the connector to the sending unit was different from original . the new pump included the different connector ,but it had to be spliced in .Check connections at tank/fuel pump.Also there were 3 ground connections 1 tank to frame 2 bed to frame on my s-10 hope this helps

Mar 30, 2011 | 2000 Chevrolet S-10

1 Answer

I own a 2000 chevy blazer with a 4.3 v6 vortec. It will turn over but not start up. I replaced the fuel pump, the fuel filter, the plugs and wires, and the pressure regulator. If i dump a little gas in the...


did you check power and ground at the fuel pump connector?there should be power at two wires at the connector,one should have constant power with the key on and thats for your fuel gage,the other power wire should have it only when cranking or for about 3-5 seconds when the key is turned on,check both of those first and that will let you know that everything is fine all the way forward of that connector,also did u replace just the pump or the whole sending unit?if you just replaced the pump the connector that runs fron the sending unit to the actual pump itself inside the tank also goes bad on this setup too,look for brown or burn marks on the inside of the sending unit where this connector hooks uo,hope this helps

Sep 11, 2009 | 2000 Chevrolet Blazer

1 Answer

Do you have to drop the tank to change the fuel pump on 93 plymouth voyager or is there a way from the top?


Yes the tank must be removed

Fuel Pump: Service and Repair
WARNING: The fuel system is under constant pressure, even when the engine is OFF. Always release fuel pressure before servicing any fuel
system component.
FUEL PUMP REMOVAL
1. Release fuel system pressure.
2. Fuel tank must be removed prior to fuel pump service.
3. Using a hammer and a brass drift, carefully tap the fuel pump lock-ring counter-clockwise to release the fuel pump.
4. Remove the fuel pump and its O-ring from the fuel tank, and discard the old O-ring.
5. Cover tank openings to prevent dirt from entering system.
FUEL GAUGE SENDING UNIT REMOVAL
1. Gently bend the sending unit locking tabs away from the sending unit.
2. Remove the electrical connector cover (red). Remove the sending unit wires from the electrical connector.
3. Use one screwdriver to push on the fuel pump body, and use another to release the sending unit locking tab from the sending unit.
4. Slide the sending unit assembly off of the fuel pump reservoir housing.
5. Pull the wires through the reservoir body and fuel pump cover plate.
FUEL GAUGE SENDING UNIT INSTALLATION
1. Bend the sending unit wires and lay them into the slot on the back of the sending unit.
2. Slide the sending unit into the slots on the fuel pump reservoir body. Slide the wires through the triangle shaped hole in the fuel pump reservoir
body. Check that the tab in the fuel sending unit locks into the detent in the fuel pump reservoir body.
3. Slip the wires onto the tab of the fuel pump reservoir body.
4. Slide the sending unit wire terminals into the electrical connector. Install the terminal locking cover.
5. Slide the fuel sending unit electrical connector into the bottom of the fuel pump electrical connector. Check that the connectors are securely
attached and fully pushed into each other.
FUEL PUMP INSTALLATION
1. Wipe seal area of tank clean, and install a new O-ring seal on pump.
2. Position fuel pump module in tank and secure with the lock-ring.
3. Using a hammer and a brass drift, carefully tap the fuel pump lock-ring clockwise to lock the module in place.
NOTE: Do not overtighten the lock-ring, because the fuel pump seal could split and leak.
4. Install fuel tank assembly.
NOTE: ASD and fuel pump relays remain energized for 7 minutes during the following test, unless the test is stopped or the ignition switch is
turned to the OFF position.
5. Using scan tool, place ignition switch in "RUN" position and use Actuate Output Test "Auto Shutdown (ASD) Relay", to activate fuel pump and
pressurize system.
6. Check for leaks.

Sep 10, 2009 | 1993 Plymouth Voyager

1 Answer

What wire is the power for the fuel pump at the pump


there were some production changes in 1998 to the fuel pump wiring, so the connector can have 2 diff fuel pump power wire colors, the most common color is grey, but the the harness at the tank has just 4 wires, the larger wires at the four wire oval connector are the fuel pump 12 Volt and the other is the ground, it is black, the other 2 wires are the sending unit, also the connectors ( Chevy factory service bulletin) on this year had a problem with burning, so if you get a new fuel pump always replace the 4 wire fuel pump connector. I have attreached a picture of the connector
2ea264c.jpg

Jun 30, 2009 | 1998 Chevrolet C1500

1 Answer

How do i replace the fuel pump in my 1993 mazda 626 2.5


1. Relieve the fuel pressure and disconnect the negative battery cable.

2. If not already removed, depress the clips on each end of the rear seat cushion and remove the cushion.

3. If not already done, detach the electrical connector from the fuel pump/sending unit.

4. Remove the attaching screws from the fuel pump/sending unit access cover and remove the cover.

5. Disconnect the fuel supply and return hoses from the fuel pump/sending unit.

6. Remove the attaching screws and the fuel pump/sending unit from the fuel tank.

7. Detach the sending unit electrical connector, remove the sending unit attaching nuts and remove the sending unit from the fuel pump assembly.



To install:

1. Attach the sending unit to the fuel pump assembly and install the nuts. attach the sending unit electrical connector.

2. Install the fuel pump/sending unit into the fuel tank with a new gasket and install the mounting screws.

3. Connect the fuel supply and return lines.

4. Install the access cover and the mounting screws.

5. Attach the sending unit electrical connector.

6. Position the rear seat cushion over the floor, making sure to align the retaining pins with the clips. Push down firmly until the two retaining pins are locked into the rear seat retaining clips.

7. Connect the negative battery cable, start the engine and check for proper system operation and for fuel leaks.

Jun 13, 2009 | 1993 Mazda 626

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