How JustAnswer Works:

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

Ask Virtual Wrench (L J) Your Own Question

Virtual Wrench (L J)
Virtual Wrench (L J), Pontiac Mechanic
Category: Pontiac
Satisfied Customers: 13412
Experience:  35 years Master Mechanic
2617050
Type Your Pontiac Question Here...
Virtual Wrench (L J) is online now
A new question is answered every 9 seconds

93 pontiac firebird formula: fuel pump..car runs..12 volts..the pedal

Customer Question

hey, ok so i have a 93 pontiac firebird formula, just replaced the optispark, and fuel pump. car runs solid! (although voltmeter sometimes runs higher than 12 volts ) solid starts, than some low rpm and seems when i step on the pedal she won't take the fuel sometimes. now she won't start at all! won't turnover and i don't hear the fuel pump? bad fuel pump relay or ground? any ideas?
Submitted: 3 years ago.
Category: Pontiac
Expert:  Virtual Wrench (L J) replied 3 years ago.

Hello and welcome!

 

If the fuel pump was an aftermarket pump it could very well be the fault. Given the history on these fuel pumps, it is not uncommon at all for a new one right out of the box to be defective, or even if it does work, a lot of times they don't work for long.

 

Couple of things you can test to determine if it is at fault. First check for power at the gray wire going into the fuel pump while someone is trying to start it. You can't just turn the key on and then check it because power drops off after 2 seconds if the engine is not turning. So you would need a helper for that. Next, if it does have power at that wire, install a fuel pressure gauge on the fuel rail test port (looks like a tire valve) and measure pressure when trying to start it, it HAS to have about 45 psi, and if it is much lower it wont be enough to open the injectors. If low, replace the pump with one from the dealer. If there is no power at the wire to the fuel pump, probably the relay.

 

 

If you have further questions feel free to reply.

Please remember to click on accept so i receive credit for assisting you. and please leave some feedback.

Even if you have a subscription, please click to accept so i receive credit for working with you.You will NOT be charged again.

You can always ask follow up questions for no extra charge even after you click on accept.

By accepting, it shows me that you appreciate my time, expertise and help.

Customer: replied 3 years ago.
thanx, this is the fourth fuel pump in 5 years, would could cause a fuel pump to burn out? and do fuel pump relays show signs of going bad? i heard they work or don't. could it be a fuel pressure regulator?
Expert:  Virtual Wrench (L J) replied 3 years ago.

Hi,

 

Yes, if it is an aftermarket pump i am not surprised that you have replaced it so many times. They are just sub standard and there is so much competition on the aftermarket that a lot of parts stores just buy the cheapest ones. Sure, they may warranty one if it fails soon enough, but they sure won't come out and put it in!!

 

Yes, the relays are kind of funny like that because the contacts can intermittently not make good contact sometimes, and sometimes they just fail completely. For the most part though, they usually do just quit working with no signs of anything...

 

As far as the regulator, if you remove the vacuum line to it and there is any signs of fuel in the vac hose, then replace it. Also below is the testing procedure.

 

graphic

 

 

 

Nice ride you have there, best wishes!

 

Please don't forget to click on accept, you can always reply back with further questions later and there will be NO further charge!

 

 

 

 

Customer: replied 3 years ago.
thanx will do, one more question, where is the fuel pump relay located in a 93 firebird formula?
Expert:  Virtual Wrench (L J) replied 3 years ago.

Hi,

 

They have it tucked forward of the driver side kick panel, on foot rest bracket, under the carpet. Below is a diagram that kind of shows the general area, but you will have to dig around under the carpet and you will find it. You can use the wiring colors to confirm you have found it.

 

graphicgraphic

 

Thanks again!

 

Virtual Wrench (L J), Pontiac Mechanic
Category: Pontiac
Satisfied Customers: 13412
Experience: 35 years Master Mechanic
Virtual Wrench (L J) and 7 other Pontiac Specialists are ready to help you
Customer: replied 3 years ago.
thanx you have been very helpful! wish me luck
Expert:  Virtual Wrench (L J) replied 3 years ago.

My Pleasure.

 

Thank YOU for asking.

 

Best wishes my friend!

 

 

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
< Last | Next >
  • 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!!!! Alex Los 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. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, 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. Esther Woodstock, 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. Robin Elkton, 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. Diane Dallas, TX
 
 
 

Meet The Experts:

 
 
 
  • Dave Nova

    Pontiac Technician

    Satisfied Customers:

    1917
    ASE Master Certification. GM World Class Certification
< Last | Next >
  • http://ww2.justanswer.com/uploads/DT/dt69nova/2012-6-15_234154_pic1.64x64.jpg Dave Nova's Avatar

    Dave Nova

    Pontiac Technician

    Satisfied Customers:

    1917
    ASE Master Certification. GM World Class Certification
  • http://ww2.justanswer.com/uploads/PE/peterpete190/2012-2-24_1274_20120215135406.64x64.jpg Pete's Avatar

    Pete

    Pontiac Technician

    Satisfied Customers:

    1243
    15 Years Pontiac Technician and training.
  • http://ww2.justanswer.com/uploads/ggrote1/2009-06-27_031011_me.jpg Gary's Avatar

    Gary

    Pontiac Technician

    Satisfied Customers:

    943
    15 years GM master tech/15 years ASE master
  • http://ww2.justanswer.com/uploads/DR/drivefast1971/2012-1-12_172422_0009051tQKh.64x64.jpg Ron Z.'s Avatar

    Ron Z.

    - Pontiac Tech -

    Satisfied Customers:

    570
    18+yrs experience. State Inspector and Pontiac Diagnostics
  • http://ww2.justanswer.com/uploads/testedtuff/2009-09-26_170108_pictures.jpg John's Avatar

    John

    GM FACTORY CERTIFIED TECHNICIAN

    Satisfied Customers:

    514
    ASE A1-A8 w/L1 GM master technician.Factory certified/40 years experience
  • http://ww2.justanswer.com/uploads/Rocket2005/2009-09-13_133703_jack.jpg car tech's Avatar

    car tech

    ASE Certified Technician

    Satisfied Customers:

    446
    25 years master tech and shop owner
  • http://ww2.justanswer.com/uploads/MO/molurch/2012-6-6_214526_500.64x64.png Don 'Mo Lurch''s Avatar

    Don 'Mo Lurch'

    Pontiac Mechanic

    Satisfied Customers:

    441
    GM, Chevrolet Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics.
 
 
 
Chat Now With A Pontiac Mechanic
Virtual Wrench (L J)
Virtual Wrench (L J)
Pontiac Mechanic
13412 Satisfied Customers
35 years Master Mechanic