* Fuel Pump Type: The 1993 6.5L uses an electric lift pump (located in the tank) and a mechanical injection pump (mounted on the engine). You can't directly adjust the *mechanical* injection pump's fuel output without specialized tools and knowledge; doing so incorrectly can severely damage the engine.
* Electronic Control Module (ECM): The ECM controls the lift pump and regulates the amount of fuel delivered by the injection pump based on various sensor inputs (e.g., throttle position, engine speed, etc.). Modifying the ECM's parameters to increase fuel delivery requires specialized tuning software and a deep understanding of the engine's parameters. This often involves a process called "tuning" or "chipping" the ECM.
* Injection Pump Adjustments (Not Recommended): While there are ways to slightly alter the fuel delivery from the mechanical injection pump (via adjusting the rack position or other internal components), this is highly discouraged for someone without extensive experience with diesel fuel injection systems. Incorrect adjustment can lead to catastrophic engine failure, such as runaway engine speeds, damaged injectors, or excessive wear.
Instead of trying to "turn up" the fuel pump, consider these safer and more effective options for increasing power and performance:
* Performance Tuning: A qualified diesel mechanic or tuner can reprogram your ECM to optimize fuel delivery and other engine parameters for improved performance. This is a safer and more controlled way to increase power than attempting to manually adjust the injection pump.
* Upgrade Injectors: Larger or higher-flow injectors can deliver more fuel per cycle, resulting in increased power. This should be done in conjunction with ECM tuning for optimal results.
* Exhaust Modifications: Upgrading to a free-flowing exhaust system can improve engine breathing and slightly increase performance.
In short: Trying to directly "turn up" the fuel pump on a 1993 Chevy 2500 6.5L diesel is risky and likely to cause damage. If you want more power, consult a qualified diesel mechanic or tuner to explore safe and effective modification options. Attempting to modify the fuel system yourself without proper knowledge and tools is strongly advised against.
