Toyota

Have Toyota Questions? Ask a Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

Toyota
This answer was rated:

Fuel pump stay a running even with the ignition switch

Fuel pump stay a...

Fuel pump stay a running even with the ignition switch removed. It will start and run for a second then die.

Mechanic's Assistant: Have you ever replaced the fuel pump, or is this the original?

Several times and the relays also.

Mechanic's Assistant: What is the model/year of your Toyota?

2001 Tundra

Mechanic's Assistant: Are you fixing your Tundra yourself? What have you tried so far?

Yes, I'm a ARE master tech with 45 years experience.

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

If I disconnect the battery for several hours then reconnect the problem resolves itself, very intermittent.

Show More
Show Less
Ask Your Own Toyota Question
Answered in 2 hours by:
11/9/2017
Jaybird61
Jaybird61, ASE Certified Master Technician
Category: Toyota
Satisfied Customers: 2,301
Experience: Automotive Instructor at Palm Beach State College
Verified

Hi, My name is Jay

The problem is caused by a stuck on relay. If you tap on the C/OPN and EFI relays in the engine fuse box when problem is happening and the pump shuts off when it is tapped then replace the suspect relays.

Ask Your Own Toyota Question

If you have no other questions for me then please enter a 5 star rating so i get credit for assisting you today. Thanks.

Ask Your Own Toyota Question
Customer reply replied 3 months ago
Have replaced the relays with new ones and problem still there.

Do you have the 4.7 or 3.4 motor? The relays are controlled by the computer and if the ECM is not turning off the relay even after power is turned off for the ECM then you may have a short internal to the ECM. The C/OPN relay is the one that is being stuck on since it is one that supplies to fuel pump relay on 4.7 motor. The fuel pump relay on the 4.7 is for dual speed pump operation. The 3.4 does not use a separate fuel pump relay and runs at single speed by the C/opn relay. Have you replaced the ECM or checked harness to make sure it is not shorting between relays and ECM?

Ask Your Own Toyota Question

Let me know the engine you have and i can give you the circuit diagrams.

Ask Your Own Toyota Question
Customer reply replied 3 months ago
4.7 2WD
Ask Your Own Toyota Question

Did you have any other questions for me? If not, please enter a 5 star rating so I get credit for assisting you. Thanks.

Ask Your Own Toyota Question

I have not got a response from the last answers I sent you. Do you still need assistance?

Jaybird61
Jaybird61, ASE Certified Master Technician
Category: Toyota
Satisfied Customers: 2,301
Experience: Automotive Instructor at Palm Beach State College
Verified
Jaybird61 and 87 other Toyota Specialists are ready to help you
Ask your own question now
Ask Jaybird61 Your Own Question
Jaybird61
Jaybird61
Jaybird61, ASE Certified Master Technician
Category: Toyota
Satisfied Customers: 2,301
2,301 Satisfied Customers
Experience: Automotive Instructor at Palm Beach State College

Jaybird61 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:

THANK YOU, THANK YOU, THANK YOU!! I've got my baby back. Tomorrow I will get a tank of high octane, remove the top, go for a long long ride and enjoy my car. THANK YOU!

JugheadUSA

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:

Chris (aka-Moose)

Chris (aka-Moose)

Auto Technician

1,001 satisfied customers

16 years of experience

Marty

Marty

ASE Certified Technician

180 satisfied customers

ASE & Bosch Master Tech. 30 years experience.

Amedee

Amedee

Toyota Technician

1,229 satisfied customers

ASE certified tech advanced level specialist. Wisconsin certified emissions state inspector

Anthony

Anthony

ASE Certified Technician

401 satisfied customers

ASE Master Automobile Technician with over 20 years exp. in this field.

Richard

Richard

ASE Certified Technician

9 satisfied customers

Toyota tech. ASE Certified Technician

Skyvisions

Skyvisions

ASE Certified Technician

12,737 satisfied customers

Toyota Master Diagnostic

Genchi Genbutsu

Genchi Genbutsu

Toyota Master Technician

3,761 satisfied customers

Toyota Certified Master Diagnostic Technician, ASE Master Technician with L1 Advanced Engine

< Previous | Next >

Related Toyota Questions
Looking for 1988 toyota EFI fuel pump relay
looking for 1988 toyota EFI fuel pump relay… read more
Skyvisions
Skyvisions
ASE Certified Technician
High School or GED
12,737 satisfied customers
94 toyota pickup: cyl..fuel pump..getting power..one under the hood
I have a 94 toyota pickup 4 cyl. I just replaced my fuel pump and the old one was def bad, but now that the new one is in im not getting power back to it when I go to start it. I have tried locating a… read more
Mastertech 1
Mastertech 1
Lead Technician
Vocational, Technical or Trade Scho
1,755 satisfied customers
89 toyota: fuel pump relay and the fuse for the fuel pump
89 toyota truck 3.oL where is the fuel pump relay and the fuse for the fuel pump,located… read more
Mastertech 1
Mastertech 1
Lead Technician
Vocational, Technical or Trade Scho
1,755 satisfied customers
Fuel pump not working and no spark ,cranks over but doesn't
Fuel pump not working and no spark ,cranks over but doesn't start.l checked the main engine relay and others they check out fine. … read more
Skyvisions
Skyvisions
ASE Certified Technician
High School or GED
12,737 satisfied customers
Replaced fuel pump on a 1996 4runner. it still wont work.
replaced fuel pump on a 1996 4runner. it still wont work. checked efi relay. it works. one pin at pump connector gets 12 volts, one gets 5.9. … read more
Skyvisions
Skyvisions
ASE Certified Technician
High School or GED
12,737 satisfied customers
I changed my fuel pump on my 2009 Toyota camry and it still
I changed my fuel pump on my 2009 Toyota camry and it still wont start. it turns over acts like it will start but wont … read more
Mechanic01
Mechanic01
1,976 satisfied customers
Put new fuel pump but just cranks but don't start. 2007
Put new fuel pump but just cranks but don't start JA: Have you checked the engine's fuel supply? And the spark plugs -- are they all working? Customer: Yes JA: What is the model/year of your Toyota? C… read more
David Craig
David Craig
OWNER/MECHANIC
Associates
4,592 satisfied customers
2003 camry turns over wont start, Replaced fuel pump, fuel
2003 camry turns over wont start, Replaced fuel pump, fuel filter, checked efi relay and fuses, replaced cam sensor and had the ecu rebuilt. when key is turned to on position you can hear a buzzing so… read more
Amedee
Amedee
Toyota Technician
Vocational, Technical or Trade Scho
1,229 satisfied customers
No power to fuel pump no power to + with key on. No power at
replaced fuel pump, no power to pump, checked all fuses, read that you can jump B+ to fp, did that yesterday got power to pump. To dat no power to B+ … read more
Marty
Marty
ASE Certified Technician
Associate Degree
180 satisfied customers
2009 corolla, I replaced the fuel pump, and still no start.
2009 corolla, I replaced the fuel pump, and still no start … read more
Mechanic01
Mechanic01
1,976 satisfied customers
2002 Toyota Echo, only runs with starter fluid, fuel pump
2002 Toyota Echo, only runs with starter fluid, fuel pump just replaced (home job, so maybe done wrong or bad AutoZone fuel pump?). Has a bazillion codes (9). Random misfire, misfire on each of the fo… read more
Mechanic01
Mechanic01
1,976 satisfied customers
Not starting. Just installed new fuel pump but that did not
Not starting. Just installed new fuel pump but that did not solve the problem. … read more
Peter Bagley
Peter Bagley
master technition
Vocational, Technical or Trade School
1,033 satisfied customers
The fuel pump relay is working but there is no power for the
Hi the fuel pump relay is working but there is no power for the fuel pump at the relay. … read more
Jaybird61
Jaybird61
ASE Certified Master Technician
2,301 satisfied customers
Fuel pump stay a running even with the ignition switch
Fuel pump stay a running even with the ignition switch removed. It will start and run for a second then die. … read more
Jaybird61
Jaybird61
ASE Certified Master Technician
2,301 satisfied customers
No power to the fuel Pump. Constant. 1989. Replaced the fuel
No power to the fuel Pump. JA: Is the power loss consistent, or does it fluctuate? Customer: Constant. JA: What is the model/year of your Toyota? Customer: 1989 JA: Are you fixing your vehicle yoursel… read more
Toyota Service
Toyota Service
Toyota Dealership Service & CR Manager
1,344 satisfied customers
93 4 runner won't crank. New fuel pump, fuel pump relay, &
93 4 runner won't crank. New fuel pump, fuel pump relay, & efi relay. Still no fuel! Engine is getting fire. … read more
Toyota Service
Toyota Service
Toyota Dealership Service & CR Manager
1,344 satisfied customers
Fuel not geting to the lnjetors. New fuel pump and filter.
fuel not geting to the lnjetors JA: Has the vehicle turned into a gas hog? And how does it start -- same as usual? Customer: new fuel pump and filter JA: What is the model/year of your Toyota? Custome… read more
Gabriel Grey
Gabriel Grey
Master Service Technician
Associates
399 satisfied customers
I replaced the fuel pump and now it will start but want
I replaced the fuel pump and now it will start but want stray ru … read more
Amedee
Amedee
Toyota Technician
Vocational, Technical or Trade Scho
1,229 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