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Automotive HD/Fleet Forum

Professional automotive forum for discussion of heavy-duty trucks, buses and other on- and off-road equipment, and maintenance of automotive fleet vehicles. Discussion topics include fuels and lubricants, hydraulics, performance, on-board diagnostics, powertrain, power distribution, anti-lock braking and stability control systems, and best practices as they relate to heavy duty and fleet maintenance. This forum is for experienced automotive repair professionals only, membership required.

Continue to the description of our next automotive discussion forum, the HVAC Forum.

Recent Automotive Discussions in the Automotive HD/Fleet Forum

Vacuum pump late model npr hd gas
10/16/2025 in the HD/Fleet Forum
I'm on second after market with pulley from Amazon first one lasted 2 months. Dealer with freight is my repair shop cost 488 Amazon Dorman copy 75. Dealer 2016 v8 gas pump doesn't come with pulley. I have not found removal tool it is not like older years ...
shop software
10/07/2025 in the HD/Fleet Forum
Does anyone use Shopkey for their company? Or any other shop software in conjunction with QuickBooks? I.
7.3Ford Diesel no start
10/07/2025 in the HD/Fleet Forum
[Driveability: 02 Ford F-250 Super Duty Lariat 7.3L] Cranks, no start. Low ICP pressure. Actually it will start with a squirt of starting fluid. He has been starting and running it like that. I shot some fluid in it just to get it started and moving. Cus...
1984 GMC TOPKICK C-6000 WIRING
10/03/2025 in the HD/Fleet Forum
VIN # [...] SYSTEM WOULD NOT RECOGNIZE THIS. Hi all, this is a longshot but I'm trying to locate a wiring diagram for the windshield wiper circuit on this old workhorse. Nothing available on IDENTIFIX. Any help or info is much appreciated. Thank you ,Mark.
Low power
09/24/2025 in the HD/Fleet Forum
[Driveability: 13 International 7300 7.6L] Group, this vehicle has extremely low power, it will only make 5-6 psi of boost pressure. Started out with a 2659 FMI 14, EGR flow rate problem. found EGR cooler restricted so replaced it and EGR valve. No impro...

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