Does the electric pump run all the time the engine is on? Occasionally, the use of an electric AND a mechanical pump in parallel will overtax the mechanical pump's rubber diaphragm, rupturing it. This can also fill your oil pan with fuel if the diaphragm blows out in just the right way...
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.