Unable to diagnose and fix a 2003 Duramax LB7 that won't build rail pressure after injector service, lacking familiarity with the fuel system.

No clear step-by-step diagnostic procedure or specialized knowledge base for CP3 fuel system pressure issues, leading to trial-and-error and reliance on forums.

Severity

4High

Willingness to Pay

explicit

Added

May 22, 2026

Workarounds Described

uses external fuel supply with clear tube to check aeration
listens at dipstick tube and oil filler cap with stethoscope for fuel dripping
cracked injector lines and had helper crank to observe fuel flow
posts on Reddit to get diagnostic help from community

Implied Software Gaps

No guided diagnostic tool for diesel common rail fuel systems that walks through pressure loss scenarios
No centralized knowledge base with step-by-step CP3 troubleshooting procedures
No integration that compares live rail pressure data to expected values and suggests next steps

App Concept

DiagFlow Diesel

DiagFlow Diesel is a diagnostic assistant for diesel technicians. It provides guided troubleshooting trees for common and rare fuel system failures, leverages a database of known fault patterns, and integrates with common scan tools to interpret live data. Unlike generic manuals, it adapts to symptoms in real time and offers verified repair paths from experienced techs.

Key Features

Interactive symptom-based diagnostic workflows for Duramax, Cummins, Powerstroke
Integration with existing scan tools to pull and interpret live data
Community-verified fix library with photos and torque specs
Parts lookup and replacement procedure links

Target Users: Diesel technicians and shop owners in heavy-duty and light-duty diesel repair, typically at independent or franchise repair shops with 1-10 bays.

Revenue Model: $49/month per user subscription, with a shop license at $199/month for up to 5 users

Existing Solutions Mentioned

Live data scan toolStethoscopeExternal fuel supply with clear tube

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