"The thermo valve holds off vacuum from the warm-up regulator when engine is started cold ('77 - '79 engines). Power is applied to the thermal valve when engine is started, and approximately 30 seconds later, the valve opens. When the valve is open, vacuum to the WUR is then determined by the intake manifold. --The vacuum holdoff results in a mixture richening at warmup. The inner hose connects to the intake vacuum source and the outer hose to the WUR." JW
http://www.pelicanparts.com/catalog/images/fuel_injection/new_images/fi_fielsystem_1-7-2d17a.jpg
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Peace, Ron
www.ronorlando.net
78SC Targa 3.2 SS, 964 cams, CIS, SSI's,Dansk
Own a gun and you can rob a bank , own a bank and you can rob the world.