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 Tim Mohr Your Own Question

Tim Mohr
Tim Mohr, ASE MASTER TECH
Category: Pontiac
Satisfied Customers: 12662
Experience:  30 YRS EXPERIENCE, FOREIGN AND DOMESTIC, GAS AND DEISEL
Type Your Pontiac Question Here...
Tim Mohr is online now
A new question is answered every 9 seconds

high speed..module..constantly run my fuel pump at high pressure

Customer Question

Can i hard wire my 2 speed fuel pump to run at a constant high speed? I heard that one of the wires that goes to the fuel pump is a variable ground controlled by a module. If I directly ground out the wire it will constantly run my fuel pump at high pressure. This is for a supercharged 3800. I had a mechanic put in three fuel pumps a few years ago and after the third one, It stopped stalling out on me. Now, it is getting could and it is starting to do the same thing again. I have no idea where the 2 speed fuel pump module is or what color wire to ground. The car has barely 90K on it and I have had since new and it is in good shape.
Submitted: 3 years ago.
Category: Pontiac
Expert:  Tim Mohr replied 3 years ago.
Hi, my name is XXXXX XXXXX do not have a 2 speed fuel pump in them, who told you they did/ they are a single speed pump, with the power controlled by the fuel pump relay, and a single ground that goes straight to the body.
Customer: replied 3 years ago.
I guess that is why I could never find a fuel pump module that ran the fuel pump! The mechanic that replaced the fuel pump three times told me that it had a module that controlled he fuel pump and varied the fuel pump speed by resistance in the negative lead to the fuel pump. It kinda made sence to me at the time. It only does this in the winter time when it gets cold out. The car will simply stall. It will start sometimes, and then not at all. I have replaced the fuel relay a long time ago thinking that somehow the cold might affect it. I have put a fuel pressure gauge on the shraider valve to see the fuel pressure. It is either zero, or really low. I NEVER take my car to a mechanic but had to in the dead of winter 2 years ago for this problem. I also pinched off the return line from the pressure regulator to see if it made a difference, but it didn't. The car has never been run out of fuel, and it dosen't matter if the fuel tank if full or low.
thanks
Expert:  Tim Mohr replied 3 years ago.
if you had zero or real low pressure, and you pinched off the return and it stayed the same, then the fuel pump is bad, we only use delphi pumps in these, most parts houses sell the Airtex pumps and we see alot of problems with the airtex, napa sells a delphi pump, see if you can get one from them, they are excellent pumps and are OEM,Tim

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.