[fuelslut]

Hi there :

I'm rebuilding a LB9 (305 tpi from a 88 chevy), i'm planning to hook-up a VAC gauge to check Vacuum. I'm gettin' confused .... where i can attach the fitting for gauge ? , in a carbed engine it's so easy , but there i'm gettin' stuck, i'm new on Fuel Injections.

Here's a VAC diagram of the engine.

Any ideas ?





Cheers , JF

[DaSouthWon]

On the passengers side, at the back of the upper plenum there are 2 vacuum ports, one goes to your fuel pressure regulator and the other one goes to the air pump I believe after it tees off in several directions. You should be able to plug a vacuum gauge line to either one of these ports to check the vacuum if its temporary. If it's permanent, your gonna want a dedicated port for the most accurate reading.

[fuelslut]

It will be for permanent use , attached to a gauge in dash , how i can install this additional vacuum port ? it's a easy thing or a pain the *** ?

Thanks for your answer .

Cheers , JF

[RippinRon]

Here some pics of the ports. The pic on the left show the pcv hookup on the drivers side. The other shows three ports. The one with the hose goes to the AFPR, i'm not sure where the other ones go.

[fuelslut]

Originally Posted by RippinRon

Here some pics of the ports. The pic on the left show the pcv hookup on the drivers side. The other shows three ports. The one with the hose goes to the AFPR, i'm not sure where the other ones go.

Thanks for your answer , very good photos.
One from right picture , should go to brake booster , chech the diagram on my first post
In mine, i don't have free vacuum ports to attach the "T Fitting" for gauge , any suggestions ? I had to install a new VAC port ?



Cheers , JF

[RippinRon]

Drill and tap somewhere in the plenum and install a hose nipple!?

[fuelslut]

Originally Posted by RippinRon

Drill and tap somewhere in the plenum and install a hose nipple!?

Maybe ?

i'll research on it!

Cheers , JF