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97 Impreza fuel pump intermittent, relay!


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I know from previous post the relay ground is controlled by the computer.  This one is strange works fine some times and others not.

 

Well, I thought I had it, I swapped the heater fan relay and fuel pump relay and the fuel pump worked just fine yesterday.

 

I went to start it this morning and it would not start.  I dropped the kick panel, Computer and just moved the relay and it started and ran fine for 3 hours.  I stopped for gas about an hour into the trip and it started right back up.
 
Now sitting in the driveway for a while, I was cleaning it and then went to start it, no joy.  
 
I removed and jumped the relay and it runs fine.  
 
Wiring or Computer?  Anyone have the wiring manual or a good way to check this?  Looks like you'd have to drop the complete dash out to really get at all the wiring.
 
Thanks, 
Larry
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Yep, Load, Ground, Power.  

 

I"m going to get my meter out today and take some voltage readings under load.  I also remembered the PO had bypassed the ignition SW with 3 on off switched which I removed and put back on an Subaru Ignition SW so I'll double check that as well.  The connector looks clean and contacts are in good condition.

 

Thanks Larry

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Back probed the plug

11.5 volts on both sided of the control coil, = missing ground

11.5 volts on the input side of the fuel pump switched contact.

 

I hit the yard today and got a couple of Subaru fuel pump relays, newer ones and plug one in.  It started right up.  Hopefully it is a solid fix.

 

I believe the relay did it.  2nd day in a row with many start and stop cycles, has worked each time.

Edited by lmdew
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