Replace the cap & tank it solves the problem 8 out of 10 times. That is unless someone has torched the head gasket or it was installed improperly.
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.