Question about 2003 GMC Sonoma Extended Cab

1 Answer

2003 sonoma, 4.3. ran fine, one morning tried to start, heard a pop" not in the motor" would turn over but not start, fuel pump made no sound in "on" postion or when starter was bumped. Changed pump still not working, no power going to pump. relay does click. Does this truck have an anti-theft that kills the fuel pump? or am i missing something here?

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • GMC Master
  • 7,726 Answers

There is nothing in the circuit after the relay, however, hearing the relay doesn't mean the power is available to run the pump, as the pump circuit is separate from the relay solenoid. The pump needs power from the 20 amp "ECM B" fuse. If you probe the relay socket with a test light, there should be 2 hot terminals--one from the PCM and one from the ECM B fuse. See diagram below.


If the power is there, are you sure it's the fuel pump relay that you hear clicking? If there are other relays in the box, it may be one of them that's coming on. Try swapping the pump relay with another one. Let me know if you get stuck or have more questions.

2003 sonoma, 4.3. ran fine, one morning tried to - jturcotte_87.gif

Posted on Nov 07, 2010

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Gmc sonoma no start


You could avoid that by taking it to a qualified repair shop ! Because it obvious you do not know how to do automotive electerical testing ! How to voltage drop test starter motor circuit First off you need to know how the system works , all componets in the circuit . How to find a wiring diagram , how to use a volt meter . And in a lot of caes the ignition switch is a input to a control module , BCM - body control module ,PCM - powertrain control module etc...
Starter Voltage Drop

There is also a park neutral safety switch , starter relay in the under hood fuse box .
Electric Testing Techniques You Need to Know

How to Diagnose No Crank No Start Issue Nothing or only Click When the Key...



Mar 20, 2017 | 2001 GMC Sonoma Extended Cab

1 Answer

No compression on 2003 saab 9-3


have you checked the timing belt?? this would cause there to be no compression it may also have bent some valves

May 08, 2013 | 2003 Saab 9-3

1 Answer

03 gmc sonoma ,ran out of gas ,put in fuel,but know I start it ,wont start is it the fuel pump


yes it is probably fuel pump which is located in the gas tank. gas keeps pump from overheating. never let fuel level get too low in tank...

Jun 25, 2012 | 2003 GMC Sonoma Extended Cab

1 Answer

How to diagnose rough idle and hesitation on gmc sonoma 2.5 4 tech?


Hello I have a 1995 Sonoma 4.3 with 150.000 on her and she ran great tell last week went to pick up a lite trailer and dove it home no problem drove it all day after that. The parked it running fine and next morning it won't hold a idle but clears up at 3000 RPM runs fine drop in gear and it won't stay running??? Cleaned TBI and there was a new fuel pump and filter put on it less them 7.000 miles ago. Found vacuum leak on the booster to manifold fix that still runs like it is misfiring??? Any help would be great thanks no check engine light on.

Feb 17, 2012 | GMC Jimmy Cars & Trucks

1 Answer

1996 Explorer ran fine then wouldn't start one day. Tries to turn over but won't catch. Tried jumping, that doesn't work. PCM relay and fuel pump relay are both fine, assumed it was the fuel pump. Replaced...


The fuel pump wires are positive: pink/black and negative=black. Pull the connector, turn the key on, and check these with a test light. Your pump power runs through the PCM.

2aced27.gif

Oct 11, 2010 | 1996 Ford Explorer

1 Answer

No power to fuel pump 1998 sonoma


by turning the key to the ON position you should hear the fuel pump start to prime for 5 seconds. If not heard replace the oil sensor. If heard pumping replace the fuel pump relay instead

Jun 30, 2010 | 1998 GMC Sonoma

1 Answer

2003 Sonoma does not turn-over


U have lost the battery, check the cables, if they are clean (no corrsion) replace the battery, modern sealed batteries fail like this, crank fine and then puff nothing, happened to at least 5 times over the years and saw it all the time at work.

Jan 07, 2009 | 1999 GMC Sonoma

2 Answers

2003 gmc sonoma will turn over but not start


I've got the same problem. how did u fix it thanks

Dec 27, 2008 | 1999 GMC Sonoma

1 Answer

96 voyager stalls won't turn over after some time it goes


1- under the hood their is a two relays Fuel pump and engine cut off. locate both relays. Next time the vehicle will not start have someone inside the vehicle turn the key to start and if feel with your fingers the top of the relay and listen for the CLICK. It is possible that one of the relays is sticky. I would just replacement as they are only 10-12 bucks from most dealers and auto parts stores. If this does corrected the problem next time the vehicle does not start bang the gas tank with a sometime and try it again. If it starts after banging then you fuel pump motor is sticking

Nov 21, 2008 | 1996 Plymouth Voyager

2 Answers

Stalls / Dies / dead


this engine fuel pump prassurae low. it fuel pump celan. Your problem sovel

Jul 13, 2008 | 2003 Ford E150

Not finding what you are looking for?
2003 GMC Sonoma Extended Cab Logo

432 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts

yadayada
yadayada

Level 3 Expert

75005 Answers

Freddy

Level 3 Expert

1311 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22095 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...