Fuel Pump Not Working

Cyril · Wannabe Joined: 12 May 2012 Posts: 3

I'm nearly at the point where i can start her up but the fuel pump is not running? I've tried it directly accross the battery and it works. I've tried swapping the relay for another but to no avail. Please help me Cry

mackaymanx · Posted: Sun May 13, 2012 3:23 am Post subject:

Fuel pump only work for about 3 seconds when the ignition is turned on(to prime the system) it then shuts done. When you crank the engine it starts to run again. It continues to run as long as the ECU detects rpm from the engine via cam/crank sensors.

Cyril · Wannabe Joined: 12 May 2012 Posts: 3

Yeah I know that but its not running at all.......

mackaymanx · Posted: Sun May 13, 2012 9:52 pm Post subject:

The only thing I can think of is the relays are powered seperately to the ECU in the Subaru loom. Check the relays are getting power and earth out the activation pin on the relay to see if it will run the pump.

ElusiveStranger · Posted: Sat May 19, 2012 2:40 am Post subject:

Year? Who did your loom, etc etc....

As mackaymanx said, it should run for approx 3 secs - to pressurise the system

The signal from the ECU is a ground ie 0V. Have you got the 12v and 0v the right way around?
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Cyril · Wannabe Joined: 12 May 2012 Posts: 3

All sorted with the fuel pump now, had a relay missing would you believe!
Had a few coughs and splutters but still nothing. Do you think plug leads could be in wrong order? what is correct order?