Quote:
Originally Posted by 67ragtp
I also Posted this in the project section hoping for a look today. Well today was to be the first fire up of the ls7, unfortunately the fuel pump(ricks gs340) doesn't want to turn on. The computor is an e38 and when the key goes to the ignition I get 12volts at the pump for 3 seconds then the voltage goes to zero. The problem is while the voltage is present I dont here the pump running. The strange thing is when I bought the battery a week ago, I hooked it up with a dry gas tank, and turned the ignition one click to far and heard the pump growl for a second or two and immediatly shut it off and pulled the pump fuse to check the rest of the electrical system. Now the tank has 12 gallons in it and it dont want to turn on, I cant believe I could have damaged the pump with a momentaty turn on dry. If you guys have any ideas what to check I would appreciate it.
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you could run 12 volts to it directly (unplug the voltage wire from the computer and see if it turns on. Running it dry that briefly should not have hurt it at all.
Some pumps are very quiet, and they're all quieter with fuel in them than when empty. Maybe disconnect the fuel line out of the pump, at the rail, etc. and put in a can and see if it's pumping fuel.
If it's not pumping but works with 12 volts bypassing the computer then you'll need to check the relay and wiring. Most computers control the pump by controlling the ground for the fuel pump relay.