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mark houghton mark houghton is offline
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Join Date: Jul 2008
Location: Central Washington State
Posts: 3,776
I would narrow it down by first removing the yellow relay and jumping across the two points as mentioned above. Take that sucker out of the equation, in other words. Then, with the key on but the engine not running, if the car is stock wired you will not hear the pumps run until or if you depress the air metering plate slightly to actuate the micro switch, or reach behind the fuel head and pull the blue electrical plug off. Either of these actions will cause the pumps to run.

Do check the condition of the wire (white?) that's connected to the overboost pressure switch. That wire forms a ground connection, without which the yellow relay won't energize and the pumps won't run. If the switch itself is suspected to be toast, then simply pull the wire and ground it to the engine somewhere. Step by step process of ellimination.
Mark H. 1987 930, GP White, Wevo shifter, Borla exhaust, stock everything else. The result of a massive Pelicanite good will fire recovery effort. Truely an open book, ready for the slippery slopes to modification.
Old 05-23-2010, 06:56 AM
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