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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
2004freightliner with 3126 cat truck shut off will not fire
2004freightliner with 3126 cat truck shut off will not fire back up put cat et on ran solenoid test all injectors have short ran test with injectors unhooked circuit open … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
I have an 02 fl80 with 3126 cat. It starts and runs 3 or 4
I have an 02 fl80 with 3126 cat . It starts and runs 3 or 4 seconds and then dies. Crank again for 4 to 10 seconds it will start and run fine. If I shut it off starts fine unless it sits 15 minutes th… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
5,115 satisfied customers
3126 E cat... No power while diving, active event 39 164-11.
3126 E cat... No power while diving, active event 39 164-11. New high pressure pump. No leaks at the injector bores. All injectors are spilling the same amount of oil. … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 satisfied customers
I HAVE A CAT ENGINE 3126 1998 MODEL THAT IS RUNNING RUFF
I HAVE A CAT ENGINE 3126 1998 MODEL THAT IS RUNNING RUFF WITH NO POWER THE FUEL PRESSURE IS JUMPING BETWEEN 65 AND 110 PSI BUT THE HIGH PRESSURE SIDE LOOKS GOOD ON THE COMPUTER … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
I have a 1999 Sterling boom truck with a Cat 3126 engine.
I have a 1999 Sterling boom truck with a Cat 3126 engine. Truck has been running fine until recently. Used truck one morning, no problems. Let it idle for 20 minutes then started back down the road. T… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
Have an FL 80 Freightliner with 3126 engine that is
Have an FL 80 Freightliner with 3126 engine that is experiencing intermittently severe power loss. After sitting and cooling off power level return to normal levels only to relapse in an hour or two o… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
Fl 80 freightliner wont idle up with cruise ecm says brake
Fl 80 freightliner wont idle up with cruise ecm says brake switch is on … read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
5,115 satisfied customers
I DO ELECTRICAL WORK ON CARS, BUT MY LOCAL FIRE DEPARTMENT
I DO ELECTRICAL WORK ON CARS, BUT MY LOCAL FIRE DEPARTMENT HAS PROBLEMS WITH THE AIR PRESSURE FAN CLUTCH NOT ENGAGING WITH THE A/C ON A 01 FL80. I CAN UNPLUG THE SOLENOID AND IT COMES ON.… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 satisfied customers
I have a 3126 cat that I can pump up fuel pressure with hand
I have a 3126 cat that I can pump up fuel pressure with hand primer pump but will lose pressure if it is running or not?… 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
We have a 2003 Freightliner FL80 w/ CAT 3126. It has been
We have a 2003 Freightliner FL80 w/ CAT 3126. It has been having an intermittent sputtering or cutting out problem when seeing a load. It doesn't throw any codes for this. Dealer changed fuel pressure… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
Hello Cat Man: I have a 1999 Chevrolet C7500 with a Cat 3126
Hello Cat Man: I have a 1999 Chevrolet C7500 with a Cat 3126 engine. It just died while warmining up due to a lack of fuel. All fuel lines are clear and tight - no leaks. We have replaced the fuel shu… 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
i have a 2003 fl80 with a 3126 cat motor serial no. ckm 55015
i have a 2003 fl80 with a 3126 cat motor serial no. ckm 55015 motor droped a valve going to replace found a 2000 gmc with a 3126 cat serial no. 8yl83373 mine is a 250 hp 3126e the other a 3126b it is … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
Hi Cat Man, I am a used Cat Engine dealer, I get about 100
Hi Cat Man, I am a used Cat Engine dealer, I get about 100 calls a week for used Cat and other Diesel engines. Problem I find is that some of the calls are for Machine Engines and I mostly stock Truck… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
Have 2002 gmc truck model c7500 with cat 3126. It runs for
Have 2002 gmc truck model c7500 with cat 3126. It runs for ten minutes and runs out of fuel. Have to fill fuel filter and blead air and runs for ten minutes again.Have changed fuel filter and replaced… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
i have a 2002 Caterpillar engine model 3126 in a motorhome,
i have a 2002 Caterpillar engine model 3126 in a motorhome, how do i drain air in fuel line, or prime it?… 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

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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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