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Perry Mitchell · 08-19-2020

[QUOTE=Ccmano;313037]The chip you showed a photo of does not go to any year LT5 engine based on the numbered sticker. It is missing it's blue cover and the smaller chip you see on the top of it appears to have been added. I don't think you have a pump problem at all. The chip commands the fuel pump relay. If the chip is bad there is no power from the relay to the fuse. In any case take this one step at a time.
H

[/QUOTE

The Delco AXFK 0277 is the correct original chip for a 91 Z, although it is missing the blue cover and appears to have a piggy backed chip installed.

08-19-2020	#9
Perry Mitchell Join Date: Nov 2018 Location: Washington Posts: 98	Re: Secondary fuel pump and chip problem [QUOTE=Ccmano;313037]The chip you showed a photo of does not go to any year LT5 engine based on the numbered sticker. It is missing it's blue cover and the smaller chip you see on the top of it appears to have been added. I don't think you have a pump problem at all. The chip commands the fuel pump relay. If the chip is bad there is no power from the relay to the fuse. In any case take this one step at a time. H [/QUOTE The Delco AXFK 0277 is the correct original chip for a 91 Z, although it is missing the blue cover and appears to have a piggy backed chip installed.