Re: OT, Chevy Lumina up and died!

Posted by Bob on April 28, 2006 at 08:43:14 from (64.21.249.40):

In Reply to: Re: OT, Chevy Lumina up and died! posted by 1991 Lumina 3.1 on April 28, 2006 at 08:29:18:

The fuel pressure regulator restricts fuel from returning to the tank, to build pressure. It DOES NOT restrict fuel flow from the pump from getting into the fuel rail.

With NO vacuum to the fuel pressure regulator, the regulator will be at it's MAXIMUM pressure setting.

As vacuum is applied, it acts AGAINST the spring pressure on the diapragm, reducing fuel pressure a few PSI for better fuel economy at light load or idle.

Most regulator failures are diaphragm leaks that dump raw fuel into that vacuum line, and from there, into the intake.

About the only other way the regulator could fail would be if the spring broke, and there was no pressure against the diaphragm.

Then, without a buildup of pressure in the fuel rail, all the fuel would pass through the regulator, and through the return line, back to the tank.

Get a pressure gauge on there, and see what the pressure actually is. You've thrown a lot more money at it than what a fuel pressure gauge would cost!

If the fuel pressure is up to spec, you've got a problem with the 'puter cycling the injectors.

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