Medium and Heavy Trucks
Have Truck Repair Questions? Ask an Expert
If engine ran with no issues before bring in then they have a fuel filter not sealing that they replaced during the service!
The filter that is leaking would be before fuel pump otherwise they would see the leak.
This leak is allowing air to enter fuel system instead of fuel causing your issue.
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They either left the old seal on or a seal was left out or it got damaged during install