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Re: O/T 87 chevy pickup
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Posted by RusselAZ on November 08, 2005 at 17:34:46 from (70.97.74.129):
In Reply to: Re: O/T 87 chevy pickup posted by Fern(Mi) on November 08, 2005 at 16:59:57:
Not so. The oil pressure switch is a redundent back up. These are in the system to keep the vehicle running until shut down if the main relay fails. It does not need oil pressure to turn on the fuel pump. There is a tap wire in the loom to use for checking fuel pressure and delivery. Put 12 volt on this from the battery and listen for the pump. Fuel injected systems that do what the poster related his is doing probably have a bad pump. When the pump doesn't put out enough pressure to bypass the regulator to the tank they do the same thing as vapor lock.
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