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So the issue turned out the be pressure regulator in the diesel return line. The part was new but aftermarket and it was bleeding down. Installed a factory line and problem solved. It would not...

Thanks #themechanic. I installed a new CP4 with no change. I bypassed the fuel tank, fuel filter bracket and fuel filter with 1/2" diesel fuel line and a fuel can. Still does that same thing. This...

Pressurized the fuel system to make sure the low side volume was correct and sufficient and no changes. Have new cp4 to install tomorrow and will report back. #themechanic which other test equipment...

Ive never seen a failing CP4, only good or bad. I suppose I could try that. Fuel pressure sensor is new ac delco. No vacuum leak in fuel system.

Here is the truck idling and then I hold the accelerator pedal at a steady 3k rpms. After 5 seconds the truck loses power. I keep the accelerator pedal steady the whole time. Then you can see it come...

Should I log it with an older version or a different software like efilive? Id be glad to pay to solve this issue.

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Unplugged mass air flow and it does the same thing but good thought. I have a log if you want to see it?

This is a 2013 GM 3500 with a LML duramax. The engine is a new build with egr delete, dpf delete. cp4 pump and all injectors are new including rail pressure sensor and fuel volume control valve on...

This is a 2014 Ford F150 Velociraptor. Its basically a supercharged raptor. I had this vehicle in last year and I changed some setting with hptuners and then drove it and it passed. Since then I...

Drove it 100 miles with 1/2 tank of fuel and it passed inspection. Thank you Witt. I really appreciate your knowledge and help.

Enabled it but still nothing setting yet. Any other thoughts?

Any thoughts?

Have a 2014 ford 150 raptor Hennessy and it wont set readiness. Zero pending fault codes. Contacted them and they say take it to your nearest ford dealer and have a SVT stock flash put on it. Problem...