Working on a 96 200 EFI with the XRI style computer. The high pressure fuel pump runs continuously, even with the key in the off position.
My question is: Is there anything else in the system that could cause this other than a defective computer?
The engine will start and run, but obviously if the pump wont shut off its going to run the battery down and or burn the pump up.
On key-up, what causes the pump to stop running? Is it a pressure cut out, or is it a computer time out?
Thanks in advance
Could be the driver in the computer or the pump. I had that happen one time and it was the pump.
1995 Allison XB-2003 225 Super Mag. It's slow and I'm ok with that.
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ECU modulates the GROUND for the fuel pump. Something is grounding the negative pump terminal.
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