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Originally Posted by Torch
On or near your fuel injector fuel rail there is usually a screw on valve (looks similar to a tire valve (sort of)) where you can attach a fuel pressure gauge to.
Get a manual for your truck, it should show you where this is and what the pressure should be.
The pressure is usually pretty high, don't poke the valve with a screw driver it will spray gas everywhere.
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Thanks I will try that today. What is wrong if I have Low pressure? Is The fuel pump going bad?