Chevy

Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

This answer was rated:

Back with that 89 chev c/2500 with fuel and runability

Hey Jerry, back with that...
Hey Jerry, back with that 89 chev c/2500 with fuel and runability issues.. I can verify that I have power at the relay now. 5 wires all together, the orange is always hot..... then with key on the same orange wire is hot and 3 of the other ones go to ground
Oh , and the motor started with the f/p relay unplugged completely.
Show More
Show Less
Ask Your Own Chevy Question
Answered in 2 hours by:
3/25/2018
Jerry Newton
Jerry Newton, Chevy Technician
Category: Chevy
Satisfied Customers: 5,628
Experience: ASE Master Technician, L1, Master GM Technician. Over 20 years of bumper to bumper GM experience.
Verified

Yes, the engine should start without a fuel pump relay. The oil pressure switch closes and supplies power to the fuel pump in case of relay failure, your symptom would be extended crank time as the pump won't run until oil pressure builds up.

Ask Your Own Chevy Question

Please take a moment to rate my answers using the stars at the top of the page, that's how I get compensated. Let me know if you need anything else, I am happy to follow up.

Jerry Newton
Jerry Newton, Chevy Technician
Category: Chevy
Satisfied Customers: 5,628
Experience: ASE Master Technician, L1, Master GM Technician. Over 20 years of bumper to bumper GM experience.
Verified
Jerry Newton and 87 other Chevy Specialists are ready to help you
Ask your own question now
Customer reply replied 1 month ago
there is power at the relay, what next ?
Customer reply replied 1 month ago
there is power at the relay, whats next ??

The relay closes when you turn the key on, do you feel it click ON for two seconds, then shut off?

Ask Your Own Chevy Question
Customer reply replied 1 month ago
No. I feel nothing . There is the sound of a pump coming from near the area of the ECM. You here it run for about 8-10 seconds after turning off the key

I think you are hearing the HVAC actuator moving under the dash. So the pump doesn't come on with the key turned on at all?

Ask Your Own Chevy Question
Customer reply replied 1 month ago
I see gas squirt from the injector heads and fuel pressure jumps to 10 and drops back off. Keep in mind too Jerry, that if you start this truck about 25 times without touching the throttle it will eventually start and run, ALSO, if you start it and use the throttle(revving it ) it will start and run after 10 starts....And I agree on the HVAC sound.

And if you disconnect the relay, it acts differently?

Ask Your Own Chevy Question
Customer reply replied 1 month ago
Negative. Still get 10 psi for a couple seconds then drops off. BTW, the oil pressure switch has been replaced already in the effort to address this issue

OK, so what you need to determine is whether the ECM is turning this pump on and keeping it on. By my schematic, you should have a green/white wire at one pin of the relay, yes?

Ask Your Own Chevy Question
Customer reply replied 1 month ago
green/white stripe

That wire should get power for two seconds when you turn the key on. And it should get power as soon as you start cranking the engine.

Ask Your Own Chevy Question
Customer reply replied 1 month ago
it does

OK, so the ECM is doing what it's supposed to do. So you go to start it, you get fuel pressure for a couple of seconds, then the pressure gauge drops to zero and the engine dies?

Ask Your Own Chevy Question
Customer reply replied 1 month ago
That's the deal, yup.

Is the gray wire at that relay connector staying hot while this is happening? Or is the gray wire going dead?

Ask Your Own Chevy Question
Customer reply replied 1 month ago
what does the "other" relay do ? the one next to the f/p relay with the same # The gray wire remains at ground

The other relay is supposedly a downshift relay, if you have a TH400 trans in this truck... and you probably do.

The gray wire is supposed to supply power to the fuel pump, that wire should be hot, no?

Ask Your Own Chevy Question
Customer reply replied 1 month ago
There isNO gray wire

What wire colors do you have at the fuel pump relay.

My old schematics are not always reliable, but if you tell me what you have, maybe I can piece it together.

Ask Your Own Chevy Question
Customer reply replied 1 month ago
orange, red/w white pink w/ black green w white black w/ white ORANGE is the hot

OK, I looked at a schematic from a different source, and it matches what you have there. Pink/black is the wire that goes to the pump, does that stay hot when the engine is running?

Ask Your Own Chevy Question
Customer reply replied 1 month ago
it gets hot on crank and ignition,

Does it stay hot as the engine dies?

Ask Your Own Chevy Question
Customer reply replied 1 month ago
the engine is NOT running and it won't start

OK. So that relay must be closing, if that circuit is hot with key on or cranking.

Are you getting power to the fuel pump? Pink/black should be the wire color at the pump connector.

Ask Your Own Chevy Question
Customer reply replied 1 month ago
I don't know, the pump is in the tank. My guess would be " NO " since the truck won't start.

If you have power at the relay (you said you have power there) but NO POWER at the pump, then you'd be looking for a wiring issue between this relay and the pump. This circuit also goes to the oil pressure switch. I misspoke earlier, the wire turns to tan/black as it goes to the pump. I am going to attach the schematic here so you can sort this out. I'd have to verify whether there's actually power at the pump when this truck stalls, to determine whether it's a pump issue or a circuit issue.

Ask Your Own Chevy Question
Customer reply replied 1 month ago
This is NO help.... I have schematics and manuals. I have done all of these things you're suggesting a long time ago. I will look elsewhere for help from this point on. Thanks for trying
Was this answer helpful?
Ask Jerry Newton Your Own Question
Jerry Newton
Jerry Newton
Jerry Newton, Chevy Technician
Category: Chevy
Satisfied Customers: 5,628
5,628 Satisfied Customers
Experience: ASE Master Technician, L1, Master GM Technician. Over 20 years of bumper to bumper GM experience.

Jerry Newton 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:

I was having a terrible problem with the wheel bearings on my 98 Chevy Cavalier and I suspect that using this website saved me plenty of time and money.

Todd LRochester NY

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

< Previous | Next >

Meet the Experts:

GM Tech (Cam)

GM Tech (Cam)

Chevy Technician

15,289 satisfied customers

GM Grand Master Technician 2007. 14 years experience.

Gary

Gary

Chevy Technician

9,357 satisfied customers

15 years GM master tech

Tim&#039;s Auto Repair

Tim's Auto Repair

mechanic

8,866 satisfied customers

Have owned a repair shop for 25 yrs.

Dave Nova

Dave Nova

Chevrolet Technician

7,092 satisfied customers

ASE Master Certification. GM World Class Certification

John

John

Master A.S.E Automotive technician

4,071 satisfied customers

A.S.E MasterTechnician A1-A8 w/L1,38 years experience General Motors Master Technician

Don - Mo Lurch

Don - Mo Lurch

Auto Mech / Electronics

2,918 satisfied customers

Chevrolet Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics.

Ron Z.

Ron Z.

- Chevy Tech -

2,734 satisfied customers

18+yrs experience. State Inspector and Chevy Diagnostics

< Previous | Next >

Related Chevy Questions
Lifter gets stuck occasionally resulting in check engine
Lifter gets stuck occasionally resulting in check engine light flashing and shaking … read more
Anthony Uzmack
Anthony Uzmack
ASE Certified Service Technician
Automotive Technology
40 satisfied customers
Engine shuts off an on while interior electronics do the
Engine shuts off an on while interior electronics do the same while driving. Loss of ground? … read more
Dan
Dan
Auto Mechanics 1&2/diesel mech
I went to leave for work this morning and the engine barely
Hi, I went to leave for work this morning and the engine barely turned over like the battery was really low almost dead so to speak. It did start but the voltage went so low the dash clock reset at 12… read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
25 satisfied customers
When driving down the road with little pull on the engine,
when driving down the road with little pull on the engine, it will start to surge. The rpms flux 2-4 rpms up and down. I put a new MAF sensor on it, but it did not help. There is no check engine light… read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
Replaced the battery, the engine will not turn over or crank
Replaced the battery, the engine will not turn over or crank when I turn the key to start, no noise (clicking) but the lights work. I checked the ignition fuse under the steering wheel it wasn't blown… read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
Engine power is reduced light is on and engine power is
Engine power is reduced light is on and engine power is reduced … read more
Gary
Gary
Chevy Technician
Vocational, Technical or Trade Scho
9,357 satisfied customers
Check engine light flashing when driving past 40 mph, engine
Check engine light flashing when driving past 40 mph, engine vibrating when idle or moving slowly, slight delay of starting up engine, and car has trouble accelerating as fast as it used to do. … read more
Ron Z.
Ron Z.
- Chevy Tech -
Vocational, Technical or Trade Scho
2,734 satisfied customers
Is the Chevy Tracker 2.6 liter an interference engine.
Is the Chevy Tracker 2.6 liter an interference engine. … read more
Gary
Gary
Chevy Technician
Vocational, Technical or Trade Scho
9,357 satisfied customers
My 8.1 vortex chev engine in a 5500 truck. 2004. The engine
My 8.1 vortex chev engine in a 5500 truck. 2004 . The engine quits like you shut it off it restarts right away and runs good. This happened 7 times in 200 miles. … read more
roy
roy
Associate Degree
3 satisfied customers
The 1983 Chevy C10 305 engine will not start. this is the
The 1983 Chevy C10 305 engine will not start. Roy this is the truck that has had a rebuilt engine installed, new alternator, starter and every other part I could think of replacing by a mechanic. Now … read more
roy
roy
Associate Degree
3 satisfied customers
2003 chevy silverado 4.8 engine reduced engine power light
2003 chevy silverado 4.8 engine reduced engine power light comes on no power … read more
GM Tech (Cam)
GM Tech (Cam)
Chevy Technician
Vocational, Technical or Trade Scho
15,289 satisfied customers
Running engine stops or attempt to start engine fails, in a
Running engine stops or attempt to start engine fails, in a manner consistent with fuel starvation. Recently solved by installation of new fuel pump/sender unit, Problem has resumed approx two months … read more
Jerry Newton
Jerry Newton
Chevy Technician
5,628 satisfied customers
Engine rattle noise when cruising on V4 to V8. Front engine;
engine rattle noise when cruising on V4 to V8 JA: Where exactly do you think the noise is coming from? And how long has this been going on? Customer: Front engine; 3-4 weeks JA: What is the model/year… read more
Todd Audette
Todd Audette
Automotive Technician
Vocational, Technical or Trade School
358 satisfied customers
Check engine light is on and autozone checked with their
check engine light is on and autozone checked with their computer code P2135 then it triggered code P0017. For P0017 this was already addressed as they changed a part for it already. … read more
Jerry Newton
Jerry Newton
Chevy Technician
5,628 satisfied customers
The check engine light is on. The code is P1810. It is a
The check engine light is on. The code is P1810. It is a 2006 Chevy 1500. … read more
fordguy4u
fordguy4u
Automotive Tech
Vocational, Technical or Trade Scho
70 satisfied customers
Started engine with remote! Engine ran for about ten seconds
Started engine with remote! Engine ran for about ten seconds died,tried with the key won't start ! Checked fuel pressure on a shrader valve ! No fuel!? … read more
Gary
Gary
Senior Technician
Vocational, Technical or Trade School
89 satisfied customers
1989 5.7 liter throttle body engine. I was driving, engine
1989 5.7 liter throttle body engine. I was driving, engine was running fine, and came to stop sign. Upon trying to accelerate from the stop, the engine would hardly run. Bad miss and backfire visible … read more
rpmdiag
rpmdiag
High school
7,513 satisfied customers
The reduce engine message and the engine light on and alot
the reduce engine message and the engine light on and alot if shacking when I started it this morning … read more
Jared D
Jared D
Shop Supervisor
Bachelor\u0027s
3 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