DIY Fuel Pump Pressure Tests
The fuel pump draws the gasoline from the fuel tank and pushes it to the engine through the fuel line. The fuel reaches the fuel injectors and is sprayed into the combustion chamber. The fuel pressure regulator senses the pressure and regulates it. The amount the fuel injector sprays is based on the load the engine is propelling, and at what speed. When gasoline isn't getting to the injectors; the first part to address and likely change is the fuel pump.
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Things You'll Need
- Fuel pressure gauge kit
- Fire extinguisher
- Eye protection
- Latex gloves
- Rag
Instructions
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Testing the Fuel Pump
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1
Place the fire extinguisher nearby as a precaution, should any fuel ignite.
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2
Locate the Schrader-type valve (universal/easy-connect valve) near the top of the engine. Screw on the adapter that fits the connection from the adapters provided in the kit. Most cars have a Schrader-type attachment, but some will require adapting a connector. Use only fuel pressure designed hose and clamps if adapting a connection to assure the line can handle the pressure. The service manual will confirm the location of where to tap the line for the test.
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3
Attach the fuel pressure gauge to the adapter line.
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4
Turn on the vehicle. Be sure there are no fuel leaks.
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5
Rev the engine and maintain a steady rpm. The auto's service manual will tell the mechanic what is supposed to happen. Usually, pressure is to remain the same. The service manual will dictate what the pressure should be.
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6
Wait for the engine to cool. Remove the pressure gauge from the engine. Be ready with a rag for any fuel that may be under pressure.
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1
Tips & Warnings
Gasoline is flammable. Diesel is explosive. No open flames near fuel. Don't leave fuel rags wet with fuel, as they can spontaneously combust.
References
Resources
- Photo Credit The dirty automobile image by Hunta from Fotolia.com
