Typical causes for low fuel pressure include a dirty fuel filter, weak pump, incorrect tank venting, restricted fuel lines, a clogged pump inlet strainer and faulty electrical control. The fuel pump driver module on Ford trucks of this vintage is known for corrosion-caused failures.

Relieving Pressure with the Fuel Pump Fuse and Relay

• Locate the fuel pump fuse under the dashboard or in the engine compartment. It is usually located on the driver’s side of the vehicle.
• Remove the fuse with your hand or a pair of pliers.
• Start the engine and let it idle until it stalls.

Stuck Fuel Injector If one of the fuel injectors are damaged and stuck open, this can cause a low fuel pressure in the rail. You will often notice this by misfire codes on a specific cylinder at the same time.

this is what i understood… upgrade your fuel pump – the pressure will be the same and engine will get as much fuel as it needs, but once you upgrade your engine – it wil lreuqire more fuel and will automatically increase its flow.. but if you don’t have pump, you won’t receive more fuel.

If you want to increase the horsepower, you’ve essentially got to find ways to move more air in a greater volume through your engine.

1. Installing a High-Performance Cold Air Intake to increase horsepower.
2. Installing a High-Flow air filter and intake.
3. High Performance Exhaust System.
4. Supercharger.
5. Turbocharger.
6. Nitrous.

There are many ways to increase power to your vehicle without adding a turbo or supercharger. You could change the exhaust manifold to a exhaust header and gain more power. You could change the intake to have air induction which will allow the air to be forced into the engine giving more horsepower.