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I have a 1999 Thomas School Bus with a Cat 3126. I recently
Second Opinion] I have a 1999 Thomas School Bus with a Cat 3126. I recently changed the fuel filters, a first for me. It started fine afterwards, just with a bit of a longer turnover (I used the 3-30s… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 satisfied customers
I have a 1999 Thomas School Bus with a Cat 3126. I recently
I have a 1999 Thomas School Bus with a Cat 3126. I recently changed the fuel filters, a first for me. It started fine afterwards, just with a bit of a longer turnover (I used the 3-30s key on/off). It… read more
Curtis B.
Curtis B.
Technician
Associate Degree
1,947 satisfied customers
Shut off engine and won't start in morning, in shop and
Shut off engine and won't start in morning, in shop and warm. No fuel getting as in shutdown switch or something … read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
5,115 satisfied customers
I have 99 gmc c6500 topkick with 3126 cat only start with
i have 99 gmc c6500 topkick with 3126 cat only start with starter fuel … read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
604 satisfied customers
98 GMC 6500 vin: ***************** with a 3126 cat cranksbut
98 GMC 6500 vin: ***************** with a 3126 cat cranksbut won't start, no communication with ECM need a pin test to start diagnosing the problem.... owner said truck started fine the day before and… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
I got a 2000 GMC 6500 with 3126 Cat code 128-3 Secondary
I got a 2000 GMC 6500 with 3126 Cat code 128-3 Secondary fuel level voltage high 8 … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 satisfied customers
I have a Cat 6.6 Acert engine serial number 66602665
I have a Cat 6.6 Acert engine serial number 66602665 Arrangement number(###) ###-#### I have a hard getting it start when cold. Block heater plugged in and glow plugs working and it still will not fir… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
5,115 satisfied customers
Picked up a GMC 7500 with a C7 CAT VIN# KAL77538, they did
picked up a GMC 7500 with a C7 CAT VIN# ***** they did one piston and liner, re ringed the other 5 and put used injectors in... truck smokes whitish grey, smells like diesel to the point it burns your… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
JUST BOUGHT A 1988 FORD L8000 DUMP TRUCK WITH A 3208 CAT
JUST BOUGHT A 1988 FORD L8000 DUMP TRUCK WITH A 3208 CAT ENGINE WITH BRAND NEW COMMERCIAL BATTERIES FROM NAPA, AND IT STARTED UP FOR ME OVER 10 DIFFERENT TIMES! IT HAS 50 GALLONS OF DIESEL FUEL IN THE… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
5,115 satisfied customers
I have a 3606 engine in one of our 2 axel buses don't know
I have a 3606 engine in one of our 2 axel buses don't know much about it just wondering about fuel system type etc winds a little latterly before fires up new fuel filters replace fuel pump solinoyd b… read more
Curtis B.
Curtis B.
Technician
Associate Degree
1,947 satisfied customers
I have a 1998 gmc top kick with a cat 3126 motor will not
I have a 1998 gmc top kick with a cat 3126 motor will not start unless I manually prime then runs and stalls after the primed fuel runs out sometimes stays running driving tell you take a corner or go… read more
FIX-IT
FIX-IT
Comercial transport technician
Vocational, Technical or Trade Scho
829 satisfied customers
I have a 2003 GMC 7500 with a 3126 cat, truck came in no
Hello, I have a 2003 GMC 7500 with a 3126 cat, truck came in no start no crank, could not communicate with ecm, checked power and grounds found all ok, replace ecm, now I can communicate with ecm and … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
I have a 2000 C6500 with a CAT 3126 engine serial #8YL51753,
I have a 2000 C6500 with a CAT 3126 engine serial #8YL51753, customer called truck died after hot run, went up to check truck will start with either, wont idle, changed fuel filter, same thing added f… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
I just bought a 2002 sterling actera dump truck with a cat
I just bought a 2002 sterling actera dump truck with a cat 3126 engine at a auction and hired a trucking firm to haul it home. At the auction site, the batteries were low so they had to jump it and us… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 satisfied customers
I have a 2000 gmc 8500 with a cat 3126 it has sat for about
I have a 2000 gmc 8500 with a cat 3126 it has sat for about two years I did start it from time to time I was driving it to get a state inspection and it drove fine for about three miles then it acted … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
Have a 3126 cat ckm that will not start. Replaced heui after
Have a 3126 cat ckm that will not start. Replaced heui after local diesel shop plugged their computer into it. It started and ran for several minutes died and will not start. Have a gauge in oil line … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
Cat Man; I contacted you this morning about my 1999 Safari
Cat Man; I contacted you this morning about my 1999 Safari Zanzabar Motor Home with a 3126 Caterpiller Engine that would not start. We had problems & I lost contact… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
3126 cat need to ck compression need tool # XXXXX you help. 2000
3126 cat need to ck compression need tool # XXXXX you help. 2000 model gmc 3126 installed new and reprogramed computor ,got rid of injector short codes and then replaced all six injectors still no sta… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
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Meet the Experts:

Daniel Wilson

Daniel Wilson

6,062 satisfied customers

Owner at DJ Wilson

Cat Man

Cat Man

Cat Engine Expert

10,344 satisfied customers

I am ASE Master Truck Certified.

Wayne

Wayne

Journeyman

5,115 satisfied customers

worked on, Gmc, Macks, Freight liner,Mercedes Benz,,Ford, sterling

Jeremy

Jeremy

Certified Truck/Bus Technician

2,756 satisfied customers

ASE Med/HD Truck Technician, NATEF Diesel Engines and Electrical/Electronics Technician, Network Engineer specializing in CAN faults, Aftertertreatment, and vehicle communications

Curtis B.

Curtis B.

Technician

1,947 satisfied customers

Technician turned service manager on multiple lines of trucks and engines, used in industry.

cumminsdr

cumminsdr

Mechanic

1,886 satisfied customers

All types of Cummins applications

Chris (aka-Moose)

Chris (aka-Moose)

Technician

641 satisfied customers

24 years of experience diagnosing & repairing

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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.

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