Question about 1994 Chevrolet S-10 Blazer

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Replace fuel filter on 94 s10

How to releave pressure

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Hi Dusty,

From your description, I'm guessing Fuel Injection.

Before you do anything to the fuel system: READ THIS!!!
Take it seriously!

If your engine is Fuel Injected, gas in the fuel line can remain under pressure (+40 p.s.i.) for days.

Pulling a fuel line under pressure will result in gas shooting out. Under the right circumstances, you can release gas in a way that it becomes aerosol.

To put what this means in perspective, the most powerful non-nuclear ordinance possessed by the military is called an FAE. Fuel / Air Explosive, a.k.a. M.O.A.B. ( Mother Of All Bombs). Same aerosol. Not something you want released in your garage (or in your face) much less igniting.

Removing the gas cap will only equalize the pressures between the interior and exterior of the tank. Not the fuel lines.

Relieving the pressure is simple, so are the precautions to take to do it safely.

  • Be advised, gas is going to shoot when you do this. Your job is to control and safely contain it.
  • Wear safety glasses
  • Remove the negative cable from the battery (no sparks allowed)
  • Let the engine cool
  • Control the area, no kids, no horsing around, fireworks, road flares, etc..
  • Don't Smoke. Don't let anyone else smoke.
  • Don't Smoke. It deserves to be repeated.
  • Get some rags and a thin phillips
  • Locate the injector rack on the engine. (comment me back if you need a description)
  • On it you'll find what looks like a valve stem on a tire only thicker and metallic. This is the pressure relief port.
  • Put rags beneath and over the port to prevent the gas from shooting / spraying
  • Position the screwdriver so it can depress the valve core through the rag and apply pressure.
  • Slowly depress the valve.
  • The release will take just a second.
  • Wipe up the gas and dispose of the rags.
  • Now the pressure has been relieved and you can safely continue
I'm usually less forceful in my responses. I hope you don't take offense at my plain talk. Skipping a single one of the precautions I've outlined here has caused people to burn their houses down and worse. I needed you to take me seriously. I hope you understand my intent.

Have a Happy and Safe New Year
Mike

Posted on Jan 07, 2009

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  • Master
  • 716 Answers

Remove The Gas Cap To Release Pressure.

Posted on Jan 05, 2009

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SOURCE: no fuel pressure on 94 gmc sonoma s10. replaced

Try changing the fuel lines, if they are cloged from debris that could be the cause.

Posted on Nov 07, 2009

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