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Run vacuum from intake to fuel reg on 98 fuelrail?

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Old 05-27-2003, 02:51 AM
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Default Run vacuum from intake to fuel reg on 98 fuelrail?

I suspect i have my vacuum lines hooked wrong.

I have a 98 Fuel rail with the Feed and Return line on it.

The fuel pressure regulator has a port on it for vacuum. I ran a vacuum line from the front of the intake manifold (right behind the throttlebody) to this port on it.

Is this the correct place to hook it up?
Old 05-27-2003, 05:51 AM
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Default Re: Run vacuum from intake to fuel reg on 98 fuelrail?

I ran my vac line from the small vac take off at the rear of the manifold.
Old 05-27-2003, 11:17 AM
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Default Re: Run vacuum from intake to fuel reg on 98 fuelrail?

The 97-98 fuel rails have a regulator that does not use manifold vacuum. On stock applications the tube that is on the regulator is routed in front of the radiator and is vented to atmosphere only. Do not run manifold vacuum to this. I'm sure this might cure some weird performance issues.
Old 05-27-2003, 01:29 PM
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Default Re: Run vacuum from intake to fuel reg on 98 fuelrail?

The correct location for mounting the venturi vacuum tube on this aplication is directly in front of the throttle body and before the MAF.
Old 05-29-2003, 05:34 PM
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Default Re: Run vacuum from intake to fuel reg on 98 fuelrail?

Ok guys, sorry im kinda confused, I wanna make sure i got this right.

With my 97-98 Corvette Fuel Rail (feed fuel line and return fuel line). Where should i run the vacuum line on the regulator?

Should it run to
1) Manifold vacuum
2) Between MAF and throttle body
3) No vacuum line at all


Old 05-29-2003, 08:31 PM
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Default Re: Run vacuum from intake to fuel reg on 98 fuelrail?

2) Between MAF and throttle body

This is where the OEM line goes on a C5. The bellows has a hole in in for this very purpose.



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