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91 Corvette no feul pump

Tiny
LSC5SPD
  • MEMBER
  • 1991 CHEVROLET CORVETTE
We have a 91 Corvette with 350 EFI and can not get power to the fuel pump relay. The schematic shows an input at the ECU from the oil pressure sending unit. It shows (3) wires, however the sending unit (appears to be mounted at the rear of the motor by the distributor) only has 2 wires? When you crank the motor there is oil pressure. Is there a trick to determine if the ECU is at fault?
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Wednesday, February 1st, 2006 AT 6:47 PM

2 Replies

Tiny
CHEVY350GUY
  • MECHANIC
  • 109 POSTS
If your not getting any power at the fuel pump relay check a fuel system schematic. Not oil pressure. Check to see if you have power at the fuel pump fuse and that the fuse is good. Let us know
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Thursday, February 2nd, 2006 AT 10:30 AM
Tiny
LSC5SPD
  • MEMBER
  • 3 POSTS
Thanks for answering this question:
Yes, we have power at the fuze and it is good. The schematic we have shows the fuel pump relay coil needs a ground from the ECU, and it also shows an input required from the oil pressure sending unit. It appears that if we can supply the ground to the relay coil, the pump will run.
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Friday, February 3rd, 2006 AT 9:25 PM

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