Start with power (because weak voltage lies)
A lot of “no start” calls are really low voltage calls. The starter may crank, but control modules and fuel systems can act weird if voltage drops under load.
Check batteries, connections, grounds, and cable condition before you chase sensors. It’s not glamorous, but it saves time.
Fuel delivery: air in the system and restrictions
Clogged filters, gelled fuel, or air intrusion can all stop a diesel from firing. If it ran fine, then died, suspect fuel restriction or a supply issue.
If it’s been serviced recently, I always look for loose fittings or a filter that didn’t seal right. It happens more than people think.
Air and exhaust (yes, it matters)
A plugged air filter, a collapsed intake hose, or exhaust restrictions can change how the engine behaves. If it tries to start and stumbles, don’t ignore the basics.
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