Carb issues - E15S

[GregosM10]

Hey, I understand this is a skyline forum but I was hoping someone might be able to help me out here. Got an ‘84 M10 Prairie with an E15S that I’m trying to get running again after replacing a head gasket.
I’m having some struggles with vacuum lines after replacing a couple perished ones. They’re all set up like in the diagram I’ve attached. I’ve tried starting the motor and my carb backfires a bit but no luck getting it to run. 
 
 

Theres a 2nd port on the back of the carb that isn’t mentioned in the diagrams, right next to what I believe would be the idle screw (sorry I’m no good with carbs) - should this be attached to any lines?

 

any help would be greatly appreciated, I’m sick of pulling my hair out trying to figure this thing out 🤝🏼

[Duncan]

cool car to be working on, but I think you need some really old school help on this one

[dbm7]

The screw is for idle (pilot circuit) mixture adjustment.

Else, I'm confused ~ the diagram shows 2 carby ports, and the intake manifold port, but you're suggesting the "2nd port on the back of the carb that isn’t mentioned in the diagrams" ...yet, both carby ports are shown...que?...

...in any event, that port should be connected, but if not (like it is now), it's unlikely to cause a backfire out the carby (it would introduce false air and give you a fast/lean idle) ...sounds more like timing issues/spark plug wire routing responsible for the backfiring.

 

 

[GregosM10]

1 hour ago, dbm7 said:

Else, I'm confused ~ the diagram shows 2 carby ports, and the intake manifold port, but you're suggesting the "2nd port on the back of the carb that isn’t mentioned in the diagrams" ...yet, both carby ports are shown...que?...

Based off what you’ve said here, I think I’ve figured out a good bit of what I’ve done wrong - 

So on the line going from the PCV valve to carbon canister, there’s a T joint that is pretty much right next to that lower port - I hadn’t noticed that the hose in the diagram was curved to attach onto the carb, so I was putting that line for the lower port onto the PCV line / carbon canister line instead.

I’m going to have a flick through the manual again tomorrow and should hopefully find a diagram that’ll show me where that T joint should be connected to.

Timing also 100% needs to be sorted out as well, should be able to tackle that tomorrow as well. Definitely feel like I should be on the right track now though.