Question about 2004 Chevrolet TrailBlazer

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2004 chevy trailblazer 4.2 no power to fuel pump powewr to relay have jumper wire no broken wire

Changed fuel pump and relay

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  • Expert
  • 111 Answers

BAD RELAY OR BROKEN FUSABLE LINK

Posted on Jan 14, 2015

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

flacooo1
  • 172 Answers

SOURCE: I have a 2002 chevy blazer 4.3L that wont start

are you using the original key ?? sounds wear but in the key switch there is a sensor that detects if the right key is in use otherwise it will kill the power to the fuel pump or it can be a fuse look under the left rear passanger seat there is another set of fuses and the other set of fuses are on the driver side near the door and there is another set of fuses and relays inside the hook next to the battery

Posted on Apr 01, 2009

GM Elec
  • 1000 Answers

SOURCE: No power leaving the relay

Are you testing the relay when the engine is cold?
The air injection pump works for a very short period of time during initial cold engine start.

Once the exhaust stream is warm enough to support O2 sensor function, the pump shuts off and will not come on again until conditions are met.
Let me know.
Regards,

Posted on Apr 30, 2009

shocktroop40
  • 155 Answers

SOURCE: fuel pump wiring diagram for 1998 chevy express

Well if theres power going to the relay but not out, then you need a new relay. If theres power in and out of the relay, you might need a new fuel pump. The electric fuel pumps inside the tank are actually lubricated by the fuel as it pumps it, and if it runs dry long enough, it can burn out the pump

Posted on Aug 03, 2009

emissionwiz
  • 75051 Answers

SOURCE: changed fuel pump replaced relay checked fuses

Was the connector to the pump replaced? There is a factory bulletin to replace the connector. Also keep in mind the pump runs only one second unless the engine is cranking or started, the computer shuts it down otherwise.

Posted on Jan 30, 2011

czaa
  • 4514 Answers

SOURCE: I've changed the fuel pump

u need to buy a repair manual at a parts place or go chiltons online-books are mechanix tools also

Posted on Mar 22, 2011

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Where is the fuel cutoff switch located on a 2004 Chevy Trailblazer.


There is not a fuel cut off switch for a 2004 Trailblazer. Have your fuel pump relay checked, if it is good I would look at having your pump tested.

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If you have a voltmeter or test light, keep the jumper wire in place and check for voltage at the fuel tank connector. The pump wire will be gray. With relay out and jumpered there, you should have battery voltage at the fuel tank connector. The key doesn't even have to be on, cause the relay has voltage to it at all times. If you jumpered it right (terminals 87 and 30 on the relay), and no voltage at the tank connector, you have a broken fuel wire somewhere between the relay and the fuel tank.
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How do i test my fuel pump relay i think it is bad ? 92 chevy 1500 4x4 V8 5.0


Hi, to test your fuel pump relay, unplug the relay, identify the two control circuit terminals and the two power circuit terminals. Most relays have a diagram printed on the case itself to identify these terminals. If not, look at the mounting base of the relay. The two thin-gauge wires that connect to the relay feed the control circuit terminals; the other two thick-gauge wires connect to the power terminals. Test for continuity between the two power terminals on the relay. Using an ohmmeter, set it at the lowest resistance range and touch the meter leads to each of the relay power terminals. You should read infinite resistance; otherwise, the contact points are shorted. If this is the case, replace the relay. Connect the end of a fused jumper wire to the positive terminal of the car battery and the other end to one of the control circuit terminals on the relay. Hook the end of a regular jumper wire to the other control terminal and touch the other end of the jumper wire to a good ground on your vehicle (this could be the engine block itself). As you touch ground with the wire, the relay should make a clicking sound. If not, swap the jumper wire connections. If you still cannot hear the click sound, the relay is shorted. Replace the relay. Leave the jumper wires connected to the relay control terminals and test the power terminals for continuity as you did in step 4. This time you should read zero or a resistance value in the hundredths or thousandths. If you read infinite resistance, replace the relay.

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Have fuel problem changed 2 fuel pumps wiring and car still runs for 1/2 day then stops again 0n 2004 chevy classic


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Jun 25, 2010 | 2004 Chevrolet Malibu

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I have a 2004 Chevy Impala it has poer at the fuel pump fuse and fuse looks good but no power at fuel pump. is there a fuel pump relay switch or what could it be?


First make a set of jumper wires and jump the pump from the battery and see if it works. If it runs its the relay or the ECU,or the ignition switch.
Remove the relay and test it for B+. Then jump the terminals and see if the pump runs. If pump runs and you got B+ up to this point its the relay.
However,if no B+ at the relay means ECU not giving relay the turn on signal..
While wearing a ground wrist strap check out ECU Grounds and B+ wires for continuity from Ignition switch and other areas of interest (use shop manual)
either the switch is not telling ecu to send message to relay to turn on the pump or someone in this circuit has gone bad.

Mar 24, 2010 | 2004 Chevrolet Impala

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No power to fuel pump on 99 chevy venture


If you do not have power on the GRAY wire at the fuel pump.........
switch the fuel relay with a same type good relay in the relay box and check for power again.
REMEMBER ...YOU WILL ONLY HAVE POWER 2 OR 3 SECONDS AT PUMP AFTER KEY IS TURNED TO RUN POSITION......after key has been off for 10 seconds.(or when there is oil pressure)
If no power in the gray wire at this point and you have checked ALL fuses in engine compartment and on right (pass ) side of dash panel facing pass door.......add your own jumper to supply power to system at fuel pump fuse and test again.........if power at pump now....install a permanent jumper (SWITCHED POWER....OFF WITH KEY) at fuse box......if still no power check all connections between fuse box and pump.....or run new power feed wire to pump gray wire and disconnect old.

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I have a 2002 chevy blazer 4.3L that wont start i have replaced the fuel pump, PCM, checked the fuel pump relay and fuel filter. If i run a jumper wire from the fuel pump wire to the battery it wil start...


are you using the original key ?? sounds wear but in the key switch there is a sensor that detects if the right key is in use otherwise it will kill the power to the fuel pump or it can be a fuse look under the left rear passanger seat there is another set of fuses and the other set of fuses are on the driver side near the door and there is another set of fuses and relays inside the hook next to the battery

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My 1997 Chevy 4 dr 4x4 has fuel delivery problems.


try replacing your relay first not that expensive and easy to change also some models have a red jumper wire on the relay plug that sends power directly to pump

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