GMC

GMC troubleshooting questions? Ask a mechanic for answers

Ask an Expert,
Get an Answer ASAP!

1997 GMC Suburban. Crank, but no start. Battery replaced.

Customer Question
1997 GMC Suburban. Crank...
1997 GMC Suburban. Crank, but no start. Battery replaced. Distributor cap replaced. Good spark, but no fuel on spark plug. Dropped gas tank and no power to fuel pump. No voltage across pins 87 and 30 in relay.
Submitted: 8 months ago.Category: GMC
Show More
Show Less
Ask Your Own GMC Question
Customer reply replied 8 months ago
12.51v between positive battery terminal and pin 86 on fuel pump relay.
Customer reply replied 8 months ago
11.9v between negative battery terminal and pin 87 on fuel pump relay.
Answered in 21 minutes by:
11/16/2017
GMC Mechanic: Pete, GMC Mechanic replied 8 months ago
Pete
Pete, GMC Mechanic
Category: GMC
Satisfied Customers: 32,981
Experience: GM training and dealer tech for 14+ years. Diagnostics
Verified

Hi my name is ***** ***** I will be happy to assist with this today.In some cases I may need more info to assist better.I apologize for any delay.

In the under hood fuse box locate the fuse ECM B ( 20 amp fuse) and make sure it is o.k.,this supplies the missing power.If this fuse is blown it will need replaced.If the fuse is blown the most common cause is the fuel pump being shorted or drawing to many amps so if you replace it and it shorts again unplug the fuel pump and see if it shorts again.If it does not then the pump needs replaced.If this fuse is o.k. test to see if it has around 12 volts DC on one terminal this fuse seats into with key on or off and let me know.

If more help is needed, use the reply tab to continue our conversation. If no further assistance is needed, kindly rate my service,your 5 star rating is appreciated ( should be a link to click on here or above).You can rate at any time and we can continue to work on your question as this will not close out your question.Keep in mind in some cases it can be difficult to fully diagnose or help repair your vehicle without seeing it and I work on delivering the best possible answer from what I see to work with.

Thanks Pete

Ask Your Own GMC Question
Customer reply replied 8 months ago
Checked ECM B fuse with ohmmeter and it is good. 11.95v on one side of the terminal that this fuse inserts into.Checked voltage from negative battery terminal to pin 85 on fuel pump relay and it reads little to no voltage. I thought this was supposed to read 12v.
GMC Mechanic: Pete, GMC Mechanic replied 8 months ago

It should but only the first 2 seconds the key is on or when cranking.

Try cranking it over or test the first 2 seconds and let me know what it shows for voltage at 85

Also re test 87 and see if you have around 12 volts and let me know.Key on first 2 seconds.

Thanks Pete

Ask Your Own GMC Question
Customer reply replied 8 months ago
Though to test solo so just used autostart. 87 was at 12.3v, dropped during crank and came back up to just over 12 shortly after. Pin 85 did read 11.4v just before autostart.
GMC Mechanic: Pete, GMC Mechanic replied 8 months ago

With the relay installed does it click when you first turn on the key the first 2 seconds?

Do you have a constant ground signal on 86 at all?

Ask Your Own GMC Question
Customer reply replied 8 months ago
the relay does click when turned on the first 2 seconds. How do you recommend testing the constant ground on 86. When I test across positive side of battery to 86 it shows battery voltage. During start the voltage drops and returns which I am guessing is just the draw on the battery.
GMC Mechanic: Pete, GMC Mechanic replied 8 months ago

O.k.,if it clicks then you have the ground signal.And you have power on 87 which is what sends power to the fuel pump when the relay is energized.Re test the voltage at the pump gray wire and see if you have at or near 12 volts at it with the key on the first 2 seconds.If you do and the pump does not run test the black wires for ground at the pump.If these are o.k. then the pump needs replaced.If you are missing power at the pump then there is a break in the wiring leading from the relay to the pump needing located and repaired.

If you are missing ground at the pump trace the black wire to the frame ground and clean and tighten it.Remember you will only have power at the pump the first 2 seconds the key is on as well as when cranking over the engine.

Let me know if you need anything else and feel free to rate my help here or above ( should be a link to click on ) as this is how I receive credit for my time,this can be done at any time and you can still come back here and reply if needed.Your 5 star rating is appreciated

Thanks Pete

Ask Your Own GMC Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a gmc mechanicLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Pete Your Own Question
Pete
Pete
Pete, GMC Mechanic
Category: GMC
Satisfied Customers: 32,981
32,981 Satisfied Customers
Experience: GM training and dealer tech for 14+ years. Diagnostics

Pete is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here.

DianeDallas, TX

< Previous | Next >

Meet the Experts:

Gm Tech (Cam)

Gm Tech (Cam)

GMC Mechanic

1,796 satisfied customers

GM Grand Master Technician 2007. 14 year experience.

Gary

Gary

ASE Certified Technician

1,588 satisfied customers

GCM master tech over 25 years

Dave Nova

Dave Nova

GMC Technician

929 satisfied customers

ASE Master Certification. GM World Class Certification

Chris (aka-Moose)

Chris (aka-Moose)

GMC Technician

626 satisfied customers

16 years of experience

Ron Z.

Ron Z.

- GMC Tech -

279 satisfied customers

18+yrs experience. State Inspector & GMC Diagnostics/Repair

JFN1

JFN1

ASE Certified Technician

270 satisfied customers

GM Master Technician

George H.

George H.

ASE MasterTechnician

228 satisfied customers

15+ Years ASE Master Technician with Level 1 Certification

< Previous | Next >

Related GMC Questions
My 1999 GMC Yukon doesn't turn over when I turn the key, Is
My 1999 GMC Yukon doesn't turn over when I turn the key, Is there a wire I can test to see whats the issue?… read more
Pete
Pete
GMC Mechanic
General auto certifications
32,981 satisfied customers
2000 gmc truck with a 5.3 no power to the fuel pump I
2000 gmc truck with a 5.3 no power to the fuel pump I checked all the fuses and new relay still no power… read more
fordguy4u
fordguy4u
Automotive Tech
Vocational, Technical or Trade Scho
70 satisfied customers
Pretty sure I have a grounding issue on my 2008 GMC yukon
Pretty sure I have a grounding issue on my 2008 GMC yukon Denali XL. I've replaced the negative battery cable with a new one from GM, cleaned the terminals on the 175 amp mega fuse, added an additiona… read more
David Craig
David Craig
OWNER/MECHANIC
Associates
5,674 satisfied customers
I've got the intermittent start issue. Won't start at all
I've got the intermittent start issue. Won't start at all then all of a sudden fires up like nothing was ever wrong. I'm sure there a computer deciding that somethings wrong, then decides it's allrigh… read more
Chris (aka-Moose)
Chris (aka-Moose)
GMC Technician
Vocational, Technical or Trade School
626 satisfied customers
I cannot get the passlock system to reset. I had to rebuild
I cannot get the passlock system to reset. I had to rebuild the engine, and now that we are done, I am trying to get it running. But the secuirty light comes on, and no cranking … read more
Gary
Gary
ASE Certified Technician
Vocational, Technical or Trade Scho
1,588 satisfied customers
I hav a problem with a 95 GMC 2500 PICK UP TRUCK 5.7lt it
hi there i hav a problem with a 95 GMC 2500 PICK UP TRUCK 5.7lt it wont start there is 1 code code present 54 said something relate with fuel pump relay i already change the fuel pump and the relay… read more
Reggie Whiddon
Reggie Whiddon
Shop Foreman
Vocational, Technical or Trade School
157 satisfied customers
1999 GMC Sonoma 2.2 liter. Fuel pump was weak I bought a new
1999 GMC Sonoma 2.2 liter. Fuel pump was weak I bought a new one today. Took the bed off for easier access. Started the truck one last time to move it a little and it died. No fuel pressure. I figured… read more
Gary
Gary
ASE Certified Technician
Vocational, Technical or Trade Scho
1,588 satisfied customers
Gmc Yukon 5.3L, vehicle won't crank when trying to start .
Gmc Yukon 5.3L, vehicle won't crank when trying to start . Checked relay under hood in distrib. Box and all is good. Now if remove relay And use jumper wire across terminals it WILL Start right up. I'… read more
Gary
Gary
ASE Certified Technician
Vocational, Technical or Trade Scho
1,588 satisfied customers
GMC Yukon: I have the same problem, fuel pump is new and worked
I have the same problem, fuel pump is new and worked outside the tank, hooked it all up and no fuel in the rail , Did you all ever get this resolved?… read more
Gm Tech (Cam)
Gm Tech (Cam)
GMC Mechanic
Vocational, Technical or Trade Scho
1,796 satisfied customers
GMC sierra 1500 sle: Needing the location of the fuel pump
Needing the location of the fuel pump relay ground either under fusebox or the location where its grounded… read more
Vladgmru
Vladgmru
Automotive Electrician
Vocational, Technical or Trade Scho
1,586 satisfied customers
GMC Suburban: 1995 GMC Suburban 5.7 TBI wont start.
1995 GMC Suburban 5.7 TBI won't start. Engine turns over and won't start on starting fluid. No spark at distributor cap or ignition coil when tested with inline spark plug tester light. I've replaced … read more
Leon Davidian,Sr.
Leon Davidian,Sr.
Diagnostic Technician
Associate Degree
91 satisfied customers
GMC Sierra 2500 HD SLE: I have a 2002 GMC Sierra 2500HD. Will
I have a 2002 GMC Sierra 2500HD. Will not start. At first I thought it was the fuel pump, but upon further troubleshooting, I found that the fuel relay is not getting energized by the PCM. Working bac… read more
Chris (aka-Moose)
Chris (aka-Moose)
GMC Technician
Vocational, Technical or Trade School
626 satisfied customers
i have check the pipes an it had a little pinched at the air
i have check the pipes an it had a little pinched at the air pump but the light did not go out it had just a little drop of water how can you if the air pump relay is bad… read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
25 satisfied customers
GMC Suburban K1500 4x4: 1999 Suburban- I have no voltage coming
1999 Suburban- I have no voltage coming to the fuel pump, have replaced the relay. Where do I look now?… read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
25 satisfied customers
GMC Sierra 1500 Classic SLT: no voltage at the fuel pump connector
no voltage at the fuel pump connector on a 2000 sierra slt 4X4 extended cab put a battery to the fuel pump it works… read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
GMC Sierra 2500 HD Pickup: I have a 99 GMC Sierra 2500 pickup
I have a 99 GMC Sierra 2500 pickup with 6.0 engine 4x4 the fuel pump went out about a month ago so I replaced it and the inline filter. a couple days ago it did the samr thing as before and so I thoug… read more
Gary
Gary
ASE Certified Technician
Vocational, Technical or Trade Scho
1,588 satisfied customers
GMC Sierra 1500: Hello I have a 2002 GMC Sierra 5.3L, The problem
Hello I have a 2002 GMC Sierra 5.3L, The problem is no start, no fuel pressure, relay good, fuses good, 4.5 to 5 v at the pump, checked harness; good, ???… read more
Gary
Gary
ASE Certified Technician
Vocational, Technical or Trade Scho
1,588 satisfied customers
GMC 1500 Series: Fuel pump relay will not activate. We have
Fuel pump relay will not activate. We have 8vdc on the coil side and 12vdc on the contact side. When we jump the coil with 12vdc the coil will activate in your hand. Why do I have only 8volts at the c… read more
Canadafix
Canadafix
Auto shop owner
Vocational, Technical or Trade Scho
869 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x