stalling only on highway but every time

[Blas]

FYI: Had another person with a similar problem. I think his charging system was pumping our +15.8 Volts on a regular basis. Seeing that the MSD box is usually hooked up directly to the hot side of the starter solenoid, the MSD was seeing high voltage and was probably overheating internally. Stalling out allowed the box to cool off, and the car restarted again. for a while, then died again. Just something to check into if you have this issue. Contact me off-line if you like regarding this. I'd like to collect some data on this from people having this problem - Seeing if they are experiencing high charging rates.

[stallion112]

If you install a filter on the inlet side to the pump make sure it is 100 microns. A typical fuel filter is either 10 or 35 microns (intended for placement after the pump on the pressure side) and they are way too restrictive for the inlet side. The restriction can cause a vacuum to form just after the filter, especially on a hot day. You may then find yourself under the car removing the fuel line to purge the air pocket. Been there.