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 Cat Man Your Own Question

Cat Man
Cat Man, Caterpillar Engine Expert
Category: Heavy Equipment
Satisfied Customers: 6109
Experience:  23 Years Caterpillar Engine experience.
30708357
Type Your Heavy Equipment Question Here...
Cat Man is online now
A new question is answered every 9 seconds

Hi, have 2003 cat 3126 hep19701 in RV...crank..Was flashing code 55.

Resolved Question:

Hi, have 2003 cat 3126 HEP19701 in RV. Will crank but not start / fire. Was flashing code 55. Went to cat dealer, explained and he had me change regulator AS (fuel) at head (294-8620). Cat said this is first thing they would change if I brought in. Trying to avoid having towed at $600.00. Installed new fuel /water filter and air prior to installing regulator. Still will not start. Now showing code 49 since changing regulator today. Had fuel at hose to regulator prior to changing. Will fire with a little shot of stating fluid. Pressureized fuel tank also today. I probably cranked 12/15 times today and no luck with starting. Was running fine, always started easy. Moved in morning, ( 1 week ago) was sluggish starting that afternoon and has never started since then.
Thanks Tim
Submitted: 3 years ago.
Category: Heavy Equipment
Expert:  Cat Man replied 3 years ago.
Hi. Thanks for using JA! I will try and help you out.



I would like to measure the fuel pressure while cranking the engine if possible. Your engine needs at least 25 psi to crank. Even though you replaced the regulator, you could possibly have a bad transfer pump.




Please let me know if you have any more questions.
Customer: replied 3 years ago.
Thanks, XXXXX XXXXX check prussure right before regulator? Can I change the fuel pump if no pressure? is there any other in line screen filters. I have only one fuel filter, that is fuel / water seperator? I also forgot to tell you after changing regulator engine code went from 55 to 49. That code makes no sense.
Expert:  Cat Man replied 3 years ago.

You are welcome.

 

There should be a plug located on the secondary fuel filter housing that you can install a psi gauge into. The engine does not have any inline filter screens.

 

If the fuel pump is the problem on yur engine, you will need to remove the HEUI pump/fuel pump assembly together. On HEP engines, you cannot just remove the trnafer pump from the HEUI pump. It iwll cause damage to the HEUI pump. THe entire assmebly must be removed and then there is a special bolt that is needed to replace the transfer pump.

 

Code 49 is a fault with the intake air heater. Not sure why that would come on after replacing the regulator. However, code 49 cannot keep your engine from starting.

Cat Man, Caterpillar Engine Expert
Category: Heavy Equipment
Satisfied Customers: 6109
Experience: 23 Years Caterpillar Engine experience.
Cat Man and other Heavy Equipment Specialists are ready to help you

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 would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P Elm City, NC
< Last | Next >
  • I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P Elm City, NC
  • used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future. David L. Richmond, TX
  • 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil Marysville, CA
  • Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible. Charles Walnut Creek, CA
  • As a single woman, I really appreciate an excellent and affordable opinion.
    Thank you Geordie, I will not hesitate to contact justanswer in the future!
    Sue Charleston, WV
  • Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff. Jim Castleberry, FL
  • 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
 
 
 

Meet The Experts:

 
 
 
  • Chris (aka - Moose)

    Technician

    Satisfied Customers:

    112
    16 years of experience
< Last | Next >
  • http://ww2.justanswer.com/uploads/MU/muddyford/2012-6-13_1204_1.64x64.png Chris (aka - Moose)'s Avatar

    Chris (aka - Moose)

    Technician

    Satisfied Customers:

    112
    16 years of experience
  • http://ww2.justanswer.com/uploads/Boxerman1969/2009-06-22_213107_ja_avatar.JPG Tim's Avatar

    Tim

    Foreman

    Satisfied Customers:

    338
    23 Years Heavy Equipment and Truck Repairs Shop and Field in the Minning and Construction Industry
  • http://ww2.justanswer.com/uploads/jrwhitey2000/2009-01-03_193237_me.jpg J.R.'s Avatar

    J.R.

    Technician

    Satisfied Customers:

    148
    13 years as warranty technician for Detroit Diesel
  • http://ww2.justanswer.com/uploads/yellowman99/2010-03-20_033822_Marshall_Pete_Furr.jpg Cat Man's Avatar

    Cat Man

    Caterpillar Engine Expert

    Satisfied Customers:

    3706
    23 Years Caterpillar Engine experience.
  • http://ww2.justanswer.com/uploads/WT/wtolkson/2012-6-8_12723_JApicture2012.64x64.jpg Wayne's Avatar

    Wayne

    Journeyman

    Satisfied Customers:

    3017
    34 years experiance as engine rebuild and problems.Thermo-King repair and trouble shooting.
  • http://ww2.justanswer.com/uploads/cumminsdr/2010-7-20_204410_ja.jpg DR.Cummins's Avatar

    DR.Cummins

    FIELD SERVICE TECHNICIAN

    Satisfied Customers:

    2352
    16 Years working on Cummins Diesel engines,
  • http://ww2.justanswer.com/uploads/KO/koboma/2012-6-6_20917_DSCF1022.64x64.JPG Curtis B.'s Avatar

    Curtis B.

    service manager

    Satisfied Customers:

    2226
    30 years exp. with diesel engines, heavy equipment and forklifts, including lp forklifts