Traction Control Needed...

Mattax said
With a mechanical fuel pump,
There should be a coarse 'sock' filter on the fuel pickup in the tank.

There is, and it is new and clean.

Mattax said
A standard factory type fuel filter after the pump on the line going to the carb.

There is, and it is new and clean.

Mattax said
+ The outlet must be higher than the inlet.

It is failing here. It is mostly horizontal with a slight increase in height to the carb inlet.

Mattax said
Any porosity in the suction line to the pump and it won't pull as much fuel as it ought.
That could be cracked rubber connector lines or a pin hole in the steel line.

I think I'm ok here.

Mattax said
Interesting that it shot lean so quickly. I've gone done the track with the pressure dropping from 3-4 psi to zero but there was enough fuel to make to the line. We thought it was the pump but it turned out to be the feed line.
Vapor lock would/will occur if a portion of the line gets heat soaked. Hard to see how that would happen during the run and not other times but its possible. Has only happened to me when there's still winter fuel in the tank, and the weather is hot. Make sure your lines are away from heat and or insulated. If there's any pre-June fuel in the tank - get rid of it.
This all assuming the AFR gage is telling you fuel in the bowl ran very low.

The Scamp guzzles fuel. The winter fuel has been gone for a looooong time. You can see pictures of the horizontal fuel filter (which, is how it was set up when I received the car, I only replaced that filter) if you look at this thread. Best Fuel Pump Advice for Newb...

7milesout