Medium and Heavy Trucks

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Related Medium and Heavy Trucks Questions
Do I need to use silicone lube on my fuel injectors when
Do I need to use silicone lube on my fuel injectors when installing. And also I have looked everywhere for wiring harness I have only found it on two sites and both are out of stock. All I have is the… read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
580 satisfied customers
2008 Mack gu713. Just did injectors and cups. Won't fire.
2008 Mack gu713. Just did injectors and cups. Won't fire. Little shot starting fluid tryst to fire then I'm noticing lots of air pumped into fuel tank only if it tries to fire. Complete kit bought fro… read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
580 satisfied customers
2014 Mack cxu613 vin ***************** hard to start
2014 Mack cxu613 vin ***************** hard to start replaced fuel pump, the pump started leaking externally replaced that pump and it also is leaking, truck still has to be hand primed to start… read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
580 satisfied customers
Mack MP8 fuel primer pump is taking forever to prime, truck
Mack MP8 fuel primer pump is taking forever to prime, truck won't start, checked for double gaskets and for leaks. There is no leaks … read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
580 satisfied customers
6.7 Cummins fault code 4691. 2017 International, no. 2017
6.7 Cummins fault code 4691 JA: Have you seen this error before with the same vehicle? Customer: 2017 International , no JA: What's the make, model, and year of your car? Customer: 2017 international … read more
Nich1019
Nich1019
Diesel Technician
Vocational, Technical or Trade School
55 satisfied customers
I'm working on a 2014 mack mp7. Vin as follows 016738 model
I'm working on a 2014 mack mp7. Vin as follows 016738 model no gu813. The truck is acts like it I is losing prime and very hard to start. I have to pump it up at primer pump. When it cranks the dpf ge… read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
580 satisfied customers
Spn1231 fmi2 and son 4094 fmi 1. 2013 Mack mp8 truck runs
Spn1231 fmi2 and son 4094 fmi 1. 2013 Mack mp8 truck runs buts starts acting like it's got a miss. Checked dozer all good. Won't let do a regin cause it won't idle up with it cutting out.had code 2 we… read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
580 satisfied customers
09 Mack CXU613 with mp7, runs perfect for 15 minutes then
09 Mack CXU613 with mp7, runs perfect for 15 minutes then stops accelerating and shuts down once i pull over. … read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
580 satisfied customers
Have a 2014 mack. Changed the ignition switch a few days
Have a 2014 mack. Changed the ignition switch a few days ago. Drove the truck home it sat a few days now it turns over and not start.… read more
Bradey V
Bradey V
Certificate
2008 GU8 Mack with MP7 engine It will start right up after
2008 GU8 Mack with MP7 engine It will start right up after it sits out in the cold for two day. Take it out and drive it up to temp, park it and shut it down for a few minutes and it cranks for 30 sec… read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
580 satisfied customers
2009 Mack GU713 with a MP8-425M Hard start when sits
2009 Mack GU713 with a MP8-425M Hard start when sits overnight cranks over then shuts off … read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
580 satisfied customers
2007 Mack CTP713 stalled after running for a few hours.
2007 Mack CTP713 stalled after running for a few hours. Changed dirty fuel filters, truck would only now start and run for a few seconds then stumble and shut down.… read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
580 satisfied customers
I have a 2007 mack with the 380 engine i shut truck down for
Second opinion] i have a 2007 mack with the 380 engine i shut truck down for the day and next morning it wont start it wont hold prime i have new fuel pump new filters and we cant get prime pulling of… read more
Jeremy
Jeremy
Certified Truck/Bus Technician
Associate Degree
2,756 satisfied customers
Got a 2009 mack gu713 when it gets hot and you shut it off
got a 2009 mack gu713 when it gets hot and you shut it off will crack for every and not start again only when hot not building fuel pressure let sit for awhile and cool off starts right back up … read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
5,115 satisfied customers
08 SDP Cat In a T660 KW, losing prime over night and seem to
08 SDP Cat In a T660 KW, losing prime over night and seem to have diesel in the oil, changed all 6 injectors and the fuel enable valve as well. Changed oil and filter ran truck for an hour and parked.… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,353 satisfied customers
I have an 08 4300 that acts like its not getting fuel when
I have an 08 4300 that acts like its not getting fuel when u start it let it set for a while it starts and runs just fine it's not losing prime do u have any ideas thankyou… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,353 satisfied customers
I am getting no voltage to the eups, I melted some
I am getting no voltage to the eups, I melted some wiring 8 month ago and a service tech rewired the front 3 cylinders. Been running fine since. I parked it for two days tried to start it, it acted li… read more
Diesel fumes
Diesel fumes
8 satisfied customers
I have a 1999 NPR. The truck was running fine, then all of
I have a 1999 NPR. The truck was running fine, then all of a sudden the truck started acting like it had no power and it was starving for fuel. Made it home. Tried to start the next morning and it wou… read more
spankyjr1
spankyjr1
Retired
Vocational, Technical or Trade Scho
420 satisfied customers
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Meet the Experts:

Daniel Wilson

Daniel Wilson

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Owner at DJ Wilson

Cat Man

Cat Man

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I am ASE Master Truck Certified.

Wayne

Wayne

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

Jeremy

Jeremy

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

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Curtis B.

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cumminsdr

cumminsdr

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All types of Cummins applications

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Chris (aka-Moose)

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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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