I recently put the Walbro pump in my car while I had the rear and exhaust out. The pump is a little louder than stock so I don't know if the problem existed before replacement or not. The problem is when I shut the car off the pump continues to run. Sometimes as long as 2 minutes. So far it has always cut off on its own. What's the deal with it.

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91 Camaro RS 5.0L Black Convertible 700R4
** Added so far **
*GM Wonderbar
*Alston SFC's
*Turbo City Inj Spacer
*Dual Snorkel Air Filter
*March Performance Pulleys
*GM 3.42 Gears with OEM Zexel
*Edelbrock headers
*3" High Flow Cat
*3" Dynomax Exhaust
*Walbro 255 lph Fuel Pump
***Future 330hp Vortec Crate with LT4 hotcam and 454 TBI

 

Perhaps its the oil pressure switch. Try unplugging it and see what happens.