Gdalegonalot

My 89 sat for a year without a battery. Installed new battery. I heard the fuel pump relay click, however no power to the fuel pump fuse. I ran a hot wire to the out side of the fuse, but still no power to the fuel pump. I'm pretty good with wiring and have the tech manual but I'm at a loss as according to the manual, the wire from the fuse goes directly to the fuel pump. The car has not moved. The 'Service Engine soon' light is on but no codes except 12 on the reader.

WW7

You need to check the wiring with a multimeter from where you do have 12v, all the way along the wire to the fuel pump..Somewhere along that route you will find where the mouse chewed through your wire, or where the break in the current flow is.......WW

AGENT 86

Did you actually test voltage at fuel pump connector with jumper in place, or assume there was no power because pump didn't run ?

Cliff Harris

The ECM turns on the fuel pump (through the fuel pump relay) for 2 seconds at ignition-on to prime the fuel rails for starting. It then shuts off the fuel pump so it won't run continuously if the engine is not started. The ECM turns on the fuel pump when it sees DRPs (Distributor Reference Pulses) from the ignition module inside the distributor. The ignition module produces DRPs any time the engine is rotating, whether cranking or running.

There will be NO voltage on the fuel pump fuse if the engine is not rotating (after the initial 2 second fuel rail priming).

Cliff Harris

Your reader is not working correctly. Use the "paperclip method":

https://www.corvetteforum.com/forums...post1574918379

http://corvettephotographs.com/c4vettes/codes.htm