This is a 1991 GM TBI system. I know it is old and we don't see many of these systems anymore, but the fundamentals still apply to ALL fuel pump and fuel delivery designs. From the mechanical return type, to mechanical return-less (regulator in the tank), to electronic return-less (no regulator) systems. Even the low pressure, delivery side, of today's GDI systems! Fundamentals my friends, they do not change and this video will be valuable information for troubleshooting all of these systems. Sure there are some minor differences in testing, depending on the fuel delivery design, but the core of this is the same!
What is covered in this video:
1. How to identify a lean condition
2. Visual spray pattern test of a TBI injector
3. Using the oxygen sensor to ID a fuel delivery problem
4. Measuring fuel psi on a return type system
5. How to check fuel pump max psi (dead-head test)
6. Fuel pump power and ground testing
7. Fuel pump current and RPM measurements
8. How to ID a good ground on your meter
9. Fuel pump motor disassembly to show brushes and commutators
10. Discussion of testing for bleed down issues

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