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How to Test Fuel Pressure in a Ford Truck

by Tim Petruccio

There are only a few factors that can cause low fuel pressure in a Ford truck. Diagnosing whether your vehicle is putting out enough fuel pressure is a relatively simple task. Testing the fuel pressure in a Ford truck should take no longer than 30 minutes if you have never done this before. The tool that you will need to test the pressure is available for rental or purchase at any auto parts store.

Step 1

Locate the fuel rail under the hood at the top of the engine. The fuel rail is what feeds fuel to the fuel injectors.

Step 2

Remove the green or black screw cap from the nipple that protrudes outward from the fuel rail. This nipple is called the fuel pressure testing port.

Step 3

Attach a fuel pressure tester to the port on the fuel rail.

Step 4

Start the truck's engine.

Read the pressure on the fuel pressure tester. This is the amount of pressure that is reaching the fuel injectors. Replace the green or black fuel pressure port cap when finished reading the pressure data. The recommended fuel pressure for a standard Ford truck engine is 50 to 60 PSI. If the pressure falls more than 2 pounds below this recommendation, then you have a fuel sending problem or a possible leak.


  • If you smell raw fuel in the engine compartment, chances are you have a line leak or a leak in the fuel rail.


  • When working around the fuel system, avoid open flames, sparks and static electricity.

Items you will need

  • Fuel pressure tester

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