89 f150 FSV problems?

jrisingmoon

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I'm having problems with my FSV, I think. When I switch the cabin switch from the front tank to the rear tank, the fuel gauge makes a definite jump in the amount of fuel in the tanks so I know the gauge is working right. But when I put a test light on all 6 terminals for the cabin switch the test light doesn't light up for any of them. Does this mean I have a bad FSV, a bad cabin switch or a bad fuel pump since it is an EFI? I don't think it would be the pump since I'm getting fuel to the engine. Not sure what to make of it.
 

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